Blame etc/README.md

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> N.B. If you're interested in building Midipix using this script, please join
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the project's IRC channel #midipix on Libera and ask for the address of the
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internal repositories required in order to build Midipix.
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[//]: # "{{{ Table of contents"
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# Table of Contents
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1. [What is midipix, and how is it different?](#1-what-is-midipix-and-how-is-it-different)  
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2. [Building, installing, and using a midipix distribution](#2-building-installing-and-using-a-midipix-distribution)  
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	2.1. [Build-time dependencies](#21-build-time-dependencies)  
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		2.1.1. [Alpine-specific notate bene](#211-alpine-specific-notate-bene)  
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	2.2. [Deployment](#22-deployment)  
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	2.3. [System requirements](#23-system-requirements)  
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	2.4. [Troubleshooting](#24-troubleshooting)  
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3. [Common tasks](#3-common-tasks)  
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	3.1. [Fault-tolerant & highly optimised 3D laser show-equipped usage screen](#31-fault-tolerant--highly-optimised-3d-laser-show-equipped-usage-screen)  
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	3.2. [Adding a package](#32-adding-a-package)  
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	3.3. [Addressing build failure](#33-addressing-build-failure)  
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	3.4. [Patches and ``vars`` files](#34-patches-and-vars-files)  
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	3.5. [``pkgtool.sh``](#35-pkgtoolsh)  
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		3.5.1. [``-s``: package build shell environment](#351-s-package-build-shell-environment)  
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4. [Build variables](#4-build-variables)  
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	4.1. [Build steps](#41-build-steps)  
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	4.2. [Package variables](#42-package-variables)  
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5. [References](#5-references)  
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[//]: "}}}"
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[//]: # "{{{ 1. What is midipix, and how is it different?"
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## 1. What is midipix, and how is it different?
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midipix is a development environment that lets you create programs
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for Windows using the standard C and POSIX APIs. No compromises made,
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no shortcuts taken.  
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If you are interested in cross-platform programming that reclaims
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the notion of write once, compile everywhere; if you believe that the
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'standard' in the C Standard Library should not be a null signifier;
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and if you like cooking your code without #ifdef hell and low-level
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minutiae, then this page is for you.  
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midipix makes cross-platform programming better, simpler and faster,
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specifically by bringing a modern, conforming C Runtime Library to the
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Windows platform. While the idea itself is not new, the approach taken
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in midipix to code portability is radically different from that found
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in other projects.  
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*(reproduced from [[2](https://midipix.org/#sec-midipix)])*
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[Back to top](#table-of-contents)
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[//]: "}}}"
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[//]: # "{{{ 2. Building, installing, and using a midipix distribution"
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## 2. Building, installing and using a midipix distribution
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A Midipix distribution consists of the following:
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* the native Midipix toolchain, consisting of perk, gcc, its dependencies,
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  and binutils,
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* musl, a lightweight, fast, simple, and free libc[[1](https://www.musl-libc.org/faq.html)] used by Midipix,
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* the Midipix runtime components that bridge the gap between the libc and the
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  executive subsystems of all Windows NT-derived Windows OS starting with and
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  including Windows XP, and
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* a steadily increasing number of 3rd party open source packages, as expected in
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  any modern POSIX-compliant \*nix environment, including GNU coreutils, shells,
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  libraries such as ncurses, libressl, as well as Perl and Python.
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Install the build-time dependencies listed in section [2.1](#21-build-time-dependencies),
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clone this repository (e.g. ``git clone https://dev.midipix.org/build/midipix_build``)
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and run the following command line:
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```shell
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./build.sh -a nt64 -b release -D zipdist -P -v
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```
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By default, the build will take place within ``${HOME}/midipix/nt64/release``
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and package archive files and/or Git repositores will be downloaded into
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``${HOME}/midipix/dlcache``. Consult sections [3.1](#31-fault-tolerant--highly-optimised-3d-laser-show-equipped-usage-screen), [4](#4-build-variables), and [4.1](#42-package-variables)
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for the list of available build variables and how to override them.  
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Parallelisation is enabled by the above command line for both packages that can
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be built independently of each other and ``make(1)`` via ``-j``, limited to the
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amount of logical processors on the build host divided by two (2).
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.1. Build-time dependencies"
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### 2.1. Build-time dependencies
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* **Alpine Linux**:
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  binutils bzip2 cmake coreutils curl findutils g++ gawk gcc git grep gzip libc-dev linux-headers lzip make musl-dev net-tools patch perl perl-xml-parser procps sed tar util-linux wget xz zip
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* **Debian/-derived Linux**:
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  binutils bzip2 clzip cmake coreutils curl findutils g++ gawk gcc git grep gzip hostname libc6-dev libxml-parser-perl lzma make patch perl procps sed tar util-linux wget xz-utils zip
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* **Gentoo Linux**:
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  binutils bzip2 cmake coreutils curl findutils gawk =gcc-7.5.0-r1 dev-vcs/git grep gzip lzip make patch perl dev-perl/XML-Parser procps sed tar util-linux wget xz-utils zip
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* **OpenSUSE Linux**:
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  binutils bzip2 cmake coreutils curl findutils gawk gcc gcc-c++ git grep gzip hostname linux-glibc-devel lzip make patch perl perl-XML-Parser procps sed tar util-linux wget xz zip
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> N.B. Busybox is not supported. Awk implementations other than GNU Awk are not supported.  
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> N.B. gcc versions >7.5.0 are not supported.  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.1.1. Alpine-specific notate bene"
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#### 2.1.1. Alpine-specific notate bene
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Some packages (*coreutils*, *grep*, and *tar*, among others) override Alpine's
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BusyBox utilities of the same name, as the latter are either non-conformant or
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defective.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.2. Deployment"
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### 2.2. Deployment
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On successful completion of the build, a ZIP archive containing the Midipix
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distribution will be created inside ``${PREFIX}`` (see section [4](#4-build-variables).)
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Create a directory on the target machine and extract the contents of the distribution
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ZIP archive into it, run ``bash.bat``, and then ``/install.sh`` inside the resulting
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self-contained Midipix installation shell window.  
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> N.B. The pathname of the target directory containing ``bash.bat`` and all other
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distribution files must not contain whitespaces.  
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> N.B. The Midipix installer defaults to ``/dev/fs/c/midipix (C:\midipix)``. If left
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unchanged, the distribution ZIP archive must not be extracted into a directory of the
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same pathname.  
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> N.B. The user installing and using Midipix must have been delegated the ``SeCreateSymbolicLinkPrivilege``
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("Create symbolic links") privilege[[3](https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/user-rights-assignment)] and additionally be a non-administrator account
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owing to the UAC-related filtering policy of tokens introduced by Windows Vista[[4](https://docs.microsoft.com/en-us/previous-versions/dotnet/articles/bb530410%28v%3dmsdn%2e10%29)].  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.3. System requirements"
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### 2.3. System requirements
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The following build-time system requirements are assessed on build hosts
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equipped with the following hardware at minimum:
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* Intel(R) Xeon(R) CPU W3520 @ 2.67GHz (8 cores)
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* 7200 RPM SATA 3.1 HDD
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* 6 GB RAM
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| Target architecture | Build kind | Distribution kinds selected | Average build time | Disk space required | Peak RAM usage |
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| ------------------- | ---------- | --------------------------- | ------------------ | ------------------- | -------------- |
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| nt64                | debug      | (none)                      | 2 hours            | 57.62 GB            | 3.55 GB        |
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| nt64                | release    | (none)                      | 1 hours 45 minutes | 36.51 GB            | 3.21 GB        |
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Package archive files and/or Git repositories additionally consume at least
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1.82 GB.
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*(last update: Thu, 05 Mar 2020 09:25:41 +0000)*
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These are the Midipix distribution disk space system requirements:
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| Target architecture | Build kind | Distribution | Installation directory | Archive file |
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| ------------------- | ---------- | ------------ | ---------------------- | ------------ |
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| nt64                | debug      | 7.3 GB       |  2.3 GB                | 2.1 GB       |
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| nt64                | release    | 3.2 GB       |  913 MB                | 830 MB       |
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The installation directory and archive file may be safely deleted post-installation.
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*(last update: Thu, 07 Jan 2021 18:20:06 +0000)*
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.4. Troubleshooting"
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### 2.4. Troubleshooting
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Midipix presently provides, inter alia, strace-like functionality via
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ntctty's logging capabilities. This is available both through the regular
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``strace(1)`` command as distributed, which however **must** be provided
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with an absolute pathname without consideration for ``${PATH}``, as well
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as directly via ``ntctty.exe`` for a session by running ``ntctty.exe``
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with the ``--log-level 7`` option, e.g.:
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```shell
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$ #strace ls -la /        # (incorrect, relative pathname)
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$ strace /bin/ls -la /    # (correct, absolute pathname)
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$ ntctty.exe --log-level 7 -e /bin/ls -la /
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$ ntctty.exe --log-level=7 -e /bin/ls -la /
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$ ntctty.exe --log-level 7 -e /bin/sh -c "ls -la /"
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$ ntctty.exe --log-level=7 -e /bin/sh -c "ls -la /"
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```
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By default, ``ntctty.exe`` log files are written into the /var/log/ntctty
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directory; this may be adjusted with the ``--log-dir`` and/or
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``--log-file`` options. ``strace(1)`` logs to stderr by default.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3. Common tasks"
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## 3. Common tasks
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Rebuild set of packages in isolation:
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```shell
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./build.sh [ ... ] -r mc,zsh
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```
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Restart the ``@install`` (shorthand alias) step, with implicit ``finish``, of the
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``mc`` and ``zsh`` packages.
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```shell
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./build.sh [ ... ] -r mc,zsh:@install
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```
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Rebuild set of packages along w/ their dependencies, if any, as needed, or forcibly,
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respectively:
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```shell
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./build.sh [ ... ] -r \*mc,zsh
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./build.sh [ ... ] -r \*\*mc,zsh
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```
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Forcibly rebuild all reverse dependencies of a set of packages:
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```shell
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./build.sh [ ... ] -r \*\*\*glib,libflac
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```
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Restart the ``@configure``, ``@build``, and ``@install`` (shorthand alias) steps of the
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``coreutils`` package:
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```shell
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./build.sh -r coreutils:@configure,@build,@install
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```
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Rebuild entire build groups including or excluding group dependencies, respectively:
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```shell
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./build.sh [ ... ] -r ALL native_runtime
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./build.sh [ ... ] -r ALL =native_runtime
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```
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Forcibly (re)download all archive files and/or Git repositories associated with all packages:
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```shell
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./build.sh [ ... ] -r ALL:@fetch
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```
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.1. Fault-tolerant & highly optimised 3D laser show-equipped usage screen"
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## 3.1. Fault-tolerant & highly optimised 3D laser show-equipped usage screen
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```
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usage: ./build.sh [-a nt32|nt64]  [-b debug|release]   [-C dir[,..]]  [-D kind[,..]]
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                  [-F ipv4|ipv6|offline] [-h|--help|  [-p jobs]  [-P]  [-r ALL|LAST]
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                  [-r [*[*[*]]]name[,..][:[^|<|<=|>|>=]step,..]]  [-R] [-v[v[v[v]]]]
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                  [--as-needed] [--debug-minipix] [--dump-on-abort]  [--reset-state]
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                  [--roar]     [[=]<group>|<variable name>=<variable override>[ ..]]
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        -a nt32|nt64      Selects 32-bit or 64-bit architecture; defaults to nt64.
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        -b debug|release  Selects debug or release build kind; defaults to debug.
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        -C dir[,..]       Clean build directory (build,) ${PREFIX} before processing build
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                          scripts (prefix,) source directory (src,) and/or destination
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                          directory (dest) after successful package builds.
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        -D kind[,..]      Produce minimal midipix distribution directory (minipix,) RPM
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                          binary packages (rpm,) and/or deployable distribution ZIP
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                          archive (zipdist.) zipdist implies minipix.
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        -F ipv4|ipv6|offline
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                          Force IPv4 (ipv4) or IPv6 (ipv6) when downloading package
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                          archives and/or Git repositories or don't download either at all
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                          (offline.)
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        -h|--help         Show short/full help screen, respectively.
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        -p jobs           Enables parallelisation at group-level, whenever applicable.
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        -P                The maximum count of jobs defaults to the number of logical
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                          processors on the host system divided by two (2.)
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                          If -R is not specified and at least one (1) package fails to
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                          build, all remaining package builds will be forcibly aborted.
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        -r ALL|LAST       Restart all packages or the last failed package and resume
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                          build, resp.
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        -r [*[*[*]]]name[,..][:ALL|LAST|[^|<|<=|>|>=]step,..]
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                          Restart the specified comma-separated package(s) w/ inhibition
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                          of package build step state resetting completely (`ALL',) starting
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                          at the resp. last successfully executed build steps (`LAST',) or the
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                          specified comma-separated list of build steps, optionally subject
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                          concerning package name(s) and/or build step(s) to the below modifiers:
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                          Prepend name w/ `*' to automatically include dependencies, `**'
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                          to forcibly rebuild all dependencies, and `***` to forcibly
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                          rebuild all packages that depend on the specified package(s).
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                          Prepend step w/ `^' to filter build steps with, `<' or `<='
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                          to constrain build steps to below or below or equal with, resp.,
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                          `>' or `>=' to constrain build steps to above or above or equal
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                          with, resp.
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                          Currently defined build steps are:
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                          fetch_clean, fetch_download, fetch_extract, configure_clean,
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                          configure_patch_pre, configure_autotools, configure_patch,
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                          configure, build_clean, build, install_clean, install_subdirs,
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                          install_make, install_files, install_libs, install, install_rpm,
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                          and clean.
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                          Additionally, the following virtual steps are provided:
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                          @fetch, @configure, @build, @install, @clean, and finish.
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        -R                Ignore build failures, skip printing package logs, and continue
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                          building (relaxed mode.)
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        -v[v[v[v]]]       Be verbose; -vv: always print package logs; -vvv: set xtrace
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                          during package builds; -vvvv: logs fileops.
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        --as-needed       Don't build unless the midipix_build repository has received
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                          new commits.
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        --debug-minipix   Don't strip(1) minipix binaries to facilitate debugging minipix.
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        --dump-on-abort   Produce package environment dump files on build failure to be
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                          used in conjuction with pkg_shell.sh script (excludes -R.)
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        --reset-state     Reset package build step state on exit.
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        <group>[ ..]      One of: dev_packages, dist, host_deps, host_deps_rpm,
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                          host_toolchain, host_tools, minipix, native_packages,
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                          native_runtime, native_toolchain, native_tools.
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                          Prepend w/ `=' to inhibit group-group dependency expansion.
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        <variable name>=<variable override>[ ..]
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                          Override build or package variable.
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```
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.2. Adding a package"
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## 3.2. Adding a package
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Packages are grouped into *build groups* according to sets of common package
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variable defaults, such as ``${PKG_CFLAGS_CONFIGURE}, ${PKG_LDFLAGS_CONFIGURE}``
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and ``${PKG_CONFIGURE_ARGS}``, and semantic interrelatedness, such as the
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``native_runtime`` build group comprising the Midipix runtime components.
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Packages may belong to more than one build group such as when subsumed by a shorthand
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build group e.g. the ``dev_packages`` build group, as long as the default set of build
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groups or as overriden on the command line does not entail group membership conflicts.  
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Build groups files beneath ``groups/`` named ``[0-9][0-9][0-9].<group name>.group``
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contain package variable defaults, the alphabetically sorted list of contained
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packages in ``<upper case group name>_PACKAGES``, and their package variables
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sorted alphabetically with the exception of ``${PKG_DEPENDS}`` (if present,)
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``${PKG_SHA256SUM}``, ``${PKG_URL}``, and ``${PKG_VERSION}``, and/or ``${PKG_URLS_GIT}``,
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which are specified in this order.  
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Pick a build group according to the criteria mentioned, add the package to the
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build group's list of contained packages in its corresponding file, and add the
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set of package variables required (see above and section [4.2](#42-package-variables).)  
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Consult section [3.4](#34-patches-and-vars-files) if the package to be added
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requires patches or additional code amending or replacing package build steps
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or the entire package build. Consult section [4.1](#41-build-steps) for a list
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of package build steps and how they are overriden.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.3. Addressing build failure"
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## 3.3. Addressing build failure
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During package build, standard error and output are redirected into a log file beneath
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``${BUILD_WORKDIR}`` named ``${PKG_NAME}_stderrout.log``, following a package variable
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dump. If ``-vv`` was specified, package logs will additionally be printed to standard
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output. If ``-vvv`` was specified, ``xtrace`` will be set during package builds for
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rudimentary debugging purposes. Additionally, packages using GNU autotools will, if
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package configuration failed or appears relevant, log the configuration process in detail
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in, most usually, ``${PKG_BUILD_DIR}/config.log``.  
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If ``--dump-on-abort`` was specified, a subset of the variables set and environment
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variables exported will be written to ``${BUILD_WORKDIR}/${PKG_NAME}.dump``, which may
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subsequently be used in order to obtain a package build shell environment with the
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``pkgtool.sh`` script (see sections [3.5](#35-pkgtoolsh), [3.5.1](#351-s-package-build-shell-environment).)
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.4. Patches and ``vars`` files"
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## 3.4. Patches and ``vars`` files
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Package patches are applied prior and/or subsequent to (GNU autotools or similar) package
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configuration during the ``configure_patch_pre`` and/or ``configure_patch`` build steps,
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respectively (see section [4.1](#41-build-steps).) Patch files are searched for beneath
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``patches/`` with the following globs and in-order:
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* ``${PKG_NAME}-${PKG_VERSION}_pre.local.patch``
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  or ``${PKG_NAME}_pre.local.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}-${PKG_VERSION}_pre.local@${BUILD_HNAME}.patch``
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  or ``${PKG_NAME}_pre.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}/*.patch``
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* ``${PKG_NAME}-${PKG_VERSION}.local.patch``
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  or ``${PKG_NAME}.local.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}-${PKG_VERSION}.local@${BUILD_HNAME}.patch``
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  or ``${PKG_NAME}.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_PATCHES_EXTRA}`` (if set)
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If the default set of package build steps does not suffice, such as if additional commands
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must be executed after package configuration or prior to building, or if an entire or all
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build step must be replaced, overrides may be specified in the form of functions in the
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package's ``vars/${PKG_NAME}.vars`` ``vars`` file. Consult section [4.1](#41-build-steps)
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for a list of package build steps and how they are overriden.
Lucio Andrés Illanes Albornoz a6970c
  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.5. ``pkgtool.sh``"
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## 3.5. ``pkgtool.sh``
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```
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usage: ./pkgtool.sh [-a nt32|nt64] [-b debug|release] [-i|-m <dname> -M <dname>|-r|-s|-t] [-v]
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                    [<variable name>=<variable override>[ ..]] name
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        -a nt32|nt64          Selects 32-bit or 64-bit architecture; defaults to nt64.
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        -b debug|release      Selects debug or release build kind; defaults to debug.
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        -i                    List package variables and dependencies of single named package.
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        -m <dname>            Setup package archives mirror in <dname> and/or
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        -M <dname>            Setup Git repositories mirror in <dname>
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        -r                    List reverse dependencies of single named package.
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        -s                    Enter interactive package build shell environment for single
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                              named package; requires a package dump file. If the package
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                              has not been built yet or built successfully, it will be rebuilt
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                              at build steps up until, by default, the `build' build step and
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                              forcibly aborted and dumped prior to enterting the shell.
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        -t                    Produce tarball of package build root directory and build log
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                              file for the purpose of distribution given build failure.
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        -v                    Increase verbosity.
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        <variable name>=<variable override>[ ..]
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                              Override build variable.
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```
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> N.B. When using ``pkgtool.sh`` on a build w/ build variables (see section [4](#4-build-variables))
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overriden on the command line or via the environment, ensure that they are included in the
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``pkgtool.sh`` command line, preceding the package name, or exported, respectively.
Lucio Andrés Illanes Albornoz a6970c
  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.5.1. -s: package build shell environment"
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### 3.5.1. -s: package build shell environment
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When ``build.sh`` is executed with the ``--dump-on-abort`` option, a subset of the
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variables set and environment variables exported will be written to ``${BUILD_WORKDIR}/${PKG_NAME}.dump``
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on build failure, which may subsequently be used in order to obtain a package build shell
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environment with the ``pkgtool.sh`` script, e.g.:  
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```
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midipix_build@sandbox:(src/midipix_build)> $ ./pkgtool.sh -a nt64 -b debug -s mc
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==> 2020/03/11 15:46:28 Launching shell `/usr/bin/zsh' within package environment and `/home/midipix_build/midipix/nt64/debug/tmp'.
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==> 2020/03/11 15:46:28 Run $R to rebuild `mc'.
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==> 2020/03/11 15:46:28 Run $RS <step> to restart the specified build step of `mc'
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==> 2020/03/11 15:46:28 Run $D to automatically regenerate the patch for `mc'.
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midipix_build@sandbox:(mc-native-x86_64-nt64-midipix/obj)> $
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```
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If a package build shell environment is desired for a package that has either not been
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built at all or built successfully, ``pkgshell.sh`` will attempt to rebuild the package
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at build steps up until, by default, ``build``, and then forcibly abort the build and
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write ``${BUILD_WORKDIR}/${PKG_NAME}.dump`` as above prior to entering the shell.  
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Consult sections [3.2](#32-adding-a-package), [3.4](#34-patches-and-vars-files), [4](#4-build-variables),
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[4.1](#41-build-steps), and [4.2](#42-package-variables) for further information
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concerning the package build process.  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4. Build variables"
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## 4. Build variables
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The following variables are primarily defined in ``midipix.env`` and may be
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overriden on a per-build basis on the command-line, the environment, and/or
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``${HOME}/midipix_build.vars``, ``${HOME}/.midipix_build.vars``, and/or
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``../midipix_build.vars``, e.g.:
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```shell
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./build.sh -a nt64 -b release -D minipix,zipdist -P -v PREFIX_ROOT="${HOME}/midipix_tmp"
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env ARCH=nt64 BUILD_KIND=release PREFIX_ROOT="${HOME}/midipix_tmp" ./build.sh -D minipix,zipdist -P -v
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```
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| Variable name    | Default value                        | Description                                                                   |
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| ---------------- | ------------------------------------ | ----------------------------------------------------------------------------- |
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| ARCH             | nt64                                 | Target 32-bit (nt32) or 64-bit (nt64) architecture                            |
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| BUILD_DLCACHEDIR | ${PREFIX_ROOT}/dlcache               | Absolute pathname to package downloads cache root directory                   |
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| BUILD_HNAME      | $(hostname)                          | Build system hostname                                                         |
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| BUILD_KIND       | debug                                | Build w/ debugging (debug) or release compiler flags                          |
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| BUILD_WORKDIR    | ${PREFIX}/tmp                        | Absolute pathname to temporary package build root directory                   |
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| PREFIX           | ${PREFIX_ROOT}/${ARCH}/${BUILD_KIND} | Absolute pathname to architecture- & build type-specific build root directory |
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| PREFIX_CROSS     | ${PREFIX}/${DEFAULT_TARGET}          | Absolute pathname to toolchain root directory                                 |
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| PREFIX_MINGW32   | ${PREFIX}/x86_64-w64-mingw32         | Absolute pathname to MinGW toolchain root directory                           |
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| PREFIX_MINIPIX   | ${PREFIX}/minipix                    | Absolute pathname to minipix distribution root directory                      |
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| PREFIX_NATIVE    | ${PREFIX}/native                     | Absolute pathname to cross-compiled packages root directory                   |
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| PREFIX_ROOT      | ${HOME}/midipix                      | Absolute pathname to top-level directory                                      |
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| PREFIX_RPM       | ${PREFIX}/rpm                        | Absolute pathname to package RPM archive root directory                       |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4.1. Build steps"
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## 4.1. Build steps
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Package builds are divided up into consecutively executed build steps until
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completion or aborted on failure unless relaxed mode is enabled by passing
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``-R``.  
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Each build step corresponds to a function in the corresponding ``subr/pkg_*.subr``
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script and may be overriden entirely by a function named ``pkg_<package name>_<build step>()``
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or composed in terms of prior and/or subsequent execution by a function named
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``pkg_<package name>_<build step>_pre()`` and/or ``pkg_<package name>_<build step>_post()``,
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respectively, in the package's ``vars`` file. If a function named ``pkg_<package name>_all()``
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exists, it will override all build steps.  
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Build step status is tracked on a per-package basis by state files beneath
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``${BUILD_WORKDIR}`` following the format ``.<package name>.<build step>``;
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package build completion corresponds to the pseudo-build step ``finish``.
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| Name                | Description                                                                                                                                                                                                           |
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| ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| fetch_clean         | Delete and create ``${PKG_SUBDIR}''                                                                                                                                                                                   |
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| fetch_download      | Download package archive & verify w/ SHA-256 message digest and/or clone Git repository/ies                                                                                                                           |
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| fetch_extract       | Extract package archive, if any                                                                                                                                                                                       |
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| configure_clean     | Delete and create ``${PKG_BUILD_DIR}''                                                                                                                                                                                |
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| configure_patch_pre | Apply ``chainport`` patches and/or patches beneath ``patches/`` prior to (GNU autotools or similar) configuration                                                                                                     |
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| configure_autotools | Bootstrap (GNU autools or similar) environment, and install ``config.sub`` and ``config.cache``                                                                                                                       |
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| configure_patch     | Apply patches beneath ``patches/`` and/or set in ``${PKG_PATCHES_EXTRA}`` after (GNU autotools or similar) configuration                                                                                              |
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| configure           | Perform package (GNU autools or similar or CMake) configuration w/ configuration-time set of environment variables                                                                                                    |
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| build_clean         | Clean ``${PKG_BUILD_DIR}'' w/ ``make clean'' invocation                                                                                                                                                               |
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| build               | Call ``make(1)`` w/ build-time set of make variables                                                                                                                                                                  |
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| install_clean       | Delete and create ``${PKG_DESTDIR}''                                                                                                                                                                                  |
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| install_subdirs     | Create default directory hierarchy in ``${PKG_DESTDIR}``, optionally amended w/ ``${PKG_INSTALL_FILES_DESTDIR_EXTRA}``                                                                                                |
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| install_make        | Call ``make(1)`` w/ ``${PKG_INSTALL_TARGET}`` (defaults to ``install``) and installation-time set of make variables                                                                                                   |
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| install_files       | Install ``${PKG_INSTALL_FILES}``, fix directory and file mode bits within ``${PKG_DESTDIR}`` and optionally ``${PKG_DESTDIR_HOST}``, ``pkgconf(1)`` package files, and/or stripped binaries within ``${PKG_DESTDIR}`` |
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| install_libs        | Purge libtool ``.la`` files and install shared objects within ``${PKG_DESTDIR}`` w/ ``perk`` and corresponding symbolic links                                                                                         |
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| install             | Install into ``${PKG_PREFIX}``, and optionally ``${PKG_DESTDIR_HOST}`` into ``${PREFIX}``, under mutex, and add package to ``${PREFIX}/pkglist.${PKG_BUILD_TYPE}`` (unless inhibited)                                 |
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| install_rpm         | Build package RPM w/ auto-generated specifiation file based on ``etc/package.spec`` beneath ``${PREFIX_RPM}``                                                                                                         |
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| clean               | Clean ``${PKG_BUILD_DIR}`` and/or ``${PKG_DESTDIR}`` and/or ``${PKG_DESTDIR_HOST}`` and/or ``${PKG_BASE_DIR}/${PKG_SUBDIR}`` as per ``-C build,dest,src``, resp., if any                                              |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4.2. Package variables"
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## 4.2. Package variables
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The following variables are package-specific and receive their value from either
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top-level defaults defined in ``midipix.env``, build group-specific defaults
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from the build group the package pertains to and defined in its corresponding
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file beneath ``groups/``, or package-specific overrides defined either in the
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latter and/or in its corresponding file beneath ``vars/``, with one of the following
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prefixes:
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| Variable name prefix				|
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| ---------------------------------------------	|
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| DEFAULT					|
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| DEFAULT_``${BUILD_TYPE}``			|
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| DEFAULT_``${GROUP_NAME}``			|
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| ``${GROUP_NAME}``				|
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| PKG_``${INHERIT_FROM}``			|
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| PKG_``${INHERIT_FROM}``_``${BUILD_KIND}``	|
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| PKG_``${NAME}``				|
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| PKG_``${NAME}``_``${BUILD_KIND}``		|
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Additionally, overrides may be specified on a per-build basis on the command-
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line, with each variable prefixed w/ ``PKG_``, e.g.:
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``./build.sh [ ... ] PKG_ZSH_CC="/usr/bin/clang"``.  
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The minimum set of package variables that must be provided is ``SHA256SUM, URL,
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VERSION`` and/or ``URLS_GIT``, respectively.
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| Package variable name        | Description                                                                                                                                 |
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| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- |
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| AR                           | Command- or pathname of toolchain library archive editor ``ar(1)``                                                                          |
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| BASE_DIR                     | Absolute pathname to package build root directory beneath ``${BUILD_WORKDIR}``                                                              |
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| BUILD_DIR                    | Directory name of package build directory beneath ``${PKG_BASE_DIR}``                                                                       |
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| BUILD_STEPS_DISABLE          | List of build steps to disable during package build                                                                                         |
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| BUILD_TYPE                   | Cross-compiled toolchain (``cross``,) host (``host``,) or cross-compiled package (``native``) build type                                    |
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| CC                           | Command- or pathname of toolchain C compiler ``cc(1)``                                                                                      |
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| CFLAGS_BUILD                 | C compiler flags during package ``make(1)``  build                                                                                          |
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| CFLAGS_BUILD_EXTRA           | Additional C compiler flags during package ``make(1)``  build                                                                               |
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| CFLAGS_CONFIGURE             | C compiler flags during package (GNU autotools or similar) configuration                                                                    |
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| CFLAGS_CONFIGURE_EXTRA       | Additional C compiler flags during package (GNU autotools or similar) configuration                                                         |
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| CMAKE                        | Command- or pathname to ``cmake(1)``                                                                                                        |
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| CMAKE_ARGS                   | List of arguments to ``cmake(1)``                                                                                                           |
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| CMAKE_ARGS_EXTRA             | Additional list of arguments to ``cmake(1)``                                                                                                |
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| CMAKE_LISTFILE               | File- or pathname to ``cmake(1)`` listfile                                                                                                  |
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| CONFIG_CACHE                 | List of GNU autotools configuration cache variables                                                                                         |
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| CONFIG_CACHE_EXTRA           | Additional list of GNU autotools configuration cache variables                                                                              |
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| CONFIG_CACHE_LOCAL           | Additional list of GNU autotools configuration cache variables                                                                              |
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| CONFIGURE                    | Command- or pathname to package (GNU autotools or similar) configuration script                                                             |
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| CONFIGURE_ARGS               | List of arguments to package (GNU autotools or similar) configuration script                                                                |
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| CONFIGURE_ARGS_EXTRA         | Additional list of arguments to package (GNU autotools or similar) configuration script                                                     |
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| CONFIGURE_TYPE               | Force package configuration via either of ``autotools`` (GNU autotools or similar) or ``sofort`` or ``cmake`` (CMake)                       |
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| CXX                          | Command- or pathname of toolchain C++ compiler ``c++(1)``                                                                                   |
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| CXXFLAGS_CONFIGURE           | List of C++ compiler flags during package (GNU autotools or similar) configuration                                                          |
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| CXXFLAGS_CONFIGURE_EXTRA     | Additional list of C++ compiler flags during package (GNU autotools or similar) configuration                                               |
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| DEPENDS                      | List of package-package dependencies                                                                                                        |
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| DESTDIR                      | Directory name of package installation destination directory beneath ``${PKG_BASE_DIR}``                                                    |
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| DESTDIR_HOST                 | Directory name of optional host package installation destination directory beneath ``${PKG_BASE_DIR}``                                      |
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| DISABLED                     | Disable package                                                                                                                             |
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| ENV_VARS_EXTRA               | List of double colon-separated environment variable equality sign-separated name-value pairs to set during package build                    |
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| FNAME                        | Filename of package archive file                                                                                                            |
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| FORCE_AUTORECONF             | Forcibly run ``autoreconf -fiv`` prior to package (GNU autotools or similar) configuration                                                  |
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| GITROOT                      | midipix packages Git URL prefix                                                                                                             |
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| INHERIT_FROM                 | Inherit variables from named package                                                                                                        |
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| INSTALL_FILES                | Whitespace-separated list of files to manually install into the package installation destination directory beneath ``${PKG_BASE_DIR}``      |
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| INSTALL_FILES_DESTDIR        | Whitespace-separated list of files to initialise the package installation destination directory beneath ``${PKG_BASE_DIR}`` with            |
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| INSTALL_FILES_DESTDIR_EXTRA  | Additional whitespace-separated list of files to initialise the package installation destination directory beneath ``${PKG_BASE_DIR}`` with |
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| INSTALL_TARGET               | Name of package build ``make(1)`` installation target                                                                                       |
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| INSTALL_TARGET_EXTRA         | Additional name of package build ``make(1)`` installation target                                                                            |
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| IN_TREE                      | Build package in-tree within ``${PKG_SUBDIR}``                                                                                              |
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| LDFLAGS_BUILD_EXTRA          | Additional linker flags during package ``make(1)``  build                                                                                   |
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| LDFLAGS_CONFIGURE            | Linker flags during package (GNU autotools or similar) configuration                                                                        |
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| LDFLAGS_CONFIGURE_EXTRA      | Additional linker flags during package (GNU autotools or similar) configuration                                                             |
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| LIBTOOL                      | Command- or pathname of ``libtool(1)`` (defaults to ``slibtool``)                                                                           |
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| MAKE                         | Command line of ``make(1)``                                                                                                                 |
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| MAKEFLAGS_BUILD_EXTRA        | Additional list of ``make(1)`` flags during package ``make(1)``  build                                                                      |
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| MAKEFLAGS_BUILD              | List of ``make(1)`` flags during package ``make(1)``  build                                                                                 |
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| MAKEFLAGS_INSTALL_EXTRA      | Additional list of ``make(1)`` flags during package ``make(1)``  installation                                                               |
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| MAKEFLAGS_INSTALL            | List of ``make(1)`` flags during package ``make(1)``  installation                                                                          |
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| MAKEFLAGS_VERBOSITY          | Variable-value pair to pass to ``make(1)`` in order to force echo-back of command lines prior to execution                                  |
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| MAKE_INSTALL_VNAME           | Variable name of ``make(1)`` installation destination directory variable during package ``make(1)``  installation                           |
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| MAKE_SUBDIRS                 | List of ``make(1)`` subdirectories to exclusively build                                                                                     |
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| MIRRORS_GIT                  | List of package Git repository mirror base URLs to attempt cloning from; cf. ``pkgtool.sh -m <dname>``                                      |
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| MIRRORS                      | List of package archive mirror base URLs to attempt downloading from; cf. ``pkgtool.sh -m <dname>``                                         |
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| NO_CLEAN                     | Inhibit cleaning of package build directory beneath ``${PKG_BASE_DIR}`` pre-finish                                                          |
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| NO_CLEAN_BASE_DIR            | Inhibit cleaning of package build root directory beneath ``${BUILD_WORKDIR}``                                                               |
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| NO_LOG_VARS                  | Inhibit logging of build & package variables pre-package build                                                                              |
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| PATCHES_EXTRA                | Additional list of patches to apply                                                                                                         |
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| PKG_CONFIG                   | Command- or pathname of ``pkg-config(1)``                                                                                                   |
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| PKG_CONFIG_LIBDIR            | ``pkg-config(1)`` search directory                                                                                                          |
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| PKGLIST_DISABLE              | Inhibit inclusion into ``${PREFIX}/pkglist.${PKG_BUILD_TYPE}``                                                                              |
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| PREFIX                       | Absolute pathname of top-level installation directory and package search path                                                               |
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| PYTHON                       | Command- or pathname of Python                                                                                                              |
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| RANLIB                       | Command- or pathname of toolchain library archive index generator ``ranlib(1)``                                                             |
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| RPM_DISABLE                  | Inhibit creation of RPM archive                                                                                                             |
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| SHA256SUM                    | SHA-256 message digest of package archive                                                                                                   |
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| SOFORT_NATIVE_CC             | ``sofort`` variable during ``native`` build: Command- or pathname of toolchain C compiler ``cc(1)``                                         |
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| SOFORT_NATIVE_CFLAGS         | ``sofort`` variable during ``native`` build: C compiler flags during package (GNU autotools or similar) configuration                       |
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| SOFORT_NATIVE_CFLAGS_EXTRA   | ``sofort`` variable during ``native`` build: Additional C compiler flags during package (GNU autotools or similar) configuration            |
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| SOFORT_NATIVE_CXX            | ``sofort`` variable during ``native`` build: Command- or pathname of toolchain C++ compiler ``c++(1)``                                      |
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| SOFORT_NATIVE_CXXFLAGS       | ``sofort`` variable during ``native`` build: List of C++ compiler flags during package (GNU autotools or similar) configuration             |
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| SOFORT_NATIVE_CXXFLAGS_EXTRA | ``sofort`` variable during ``native`` build: Additional list of C++ compiler flags during package (GNU autotools or similar) configuration  |
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| SOFORT_NATIVE_LD             | ``sofort`` variable during ``native`` build: Command- or pathname of toolchain C compiler ``cc(1)``                                         |
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| SOFORT_NATIVE_LDFLAGS        | ``sofort`` variable during ``native`` build: Linker flags during package (GNU autotools or similar) configuration                           |
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| SOFORT_NATIVE_LDFLAGS_EXTRA  | ``sofort`` variable during ``native`` build: Additional linker flags during package (GNU autotools or similar) configuration                |
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| SUBDIR                       | Name of extracted archive or git-{clone,pull}(1)'d directory                                                                                |
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| TARGET                       | Dash-separated {build,host,target} triplet                                                                                                  |
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| URL                          | URL to package archive, optionally appended with whitespace-separated list of alternative URLs                                              |
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| URLS_GIT                     | List of package Git URL(s) (``*name*=*URL*@*branch*``)                                                                                      |
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| VERSION                      | Package version                                                                                                                             |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 5. References"
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## 5. References
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* ``Sun, 25 Apr 2016 09:04:08 +0000 [1]`` musl FAQ  
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* ``Wed, 04 Mar 2020 13:36:19 +0000 [2]`` midipix - what is midipix, and how is it different?  
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* ``Wed, 29 Apr 2020 23:33:34 +0100 [3]`` User Rights Assignment (Windows 10) - Windows security | Microsoft Docs  
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* ``Wed, 29 Apr 2020 23:33:50 +0100 [4]`` Windows Vista Application Development Requirements for User Account Control Compatibility | Microsoft Docs  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[modeline]: # ( vim: set tw=0: )