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A few words on sofort's tool-finding logic
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==========================================
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# the goals of sofort's tool-finding logic are:
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- follow a clear, transparent, and consistent logic
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- allow users to easily specify per-build preferences
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- allow distros to easily and cleanly use site-wide settings
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# three-way terminology:
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- native machine: where make(1) will be running.
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- host machine: where the package's program or libraries will execute.
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- target machine: where code generated by the host package will execute.
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! NOTE, however, that the host/target distinction is only relevant
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when building a code-generating utility (e.g. a compiler), and that
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the two are otherwise rather synonymous. Moreover, in practice it
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is much more common to see configure scripts being invoked with a
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--target=<machine> argument specifying the host, than with a
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--host=<machine> argument.
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# invocation and names of binary tools:
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- agnostic names (ar, nm, objdump, ...)
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- branded names (llvm-ar, llvm-nm, llvm-objdump, ...)
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- machine-prefixed agnostic names (x86_64-nt64-midipix-ar, ...)
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- machine-prefixed branded names (x86_64-linux-gnu-gcc-ar, ...)
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- machine-specifying branded tools, as in
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llvm-ar --target=x86_64-linux.
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# cross-compilation: default search order:
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- machine-prefixed agnostic tools
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- machine-prefixed branded tools, starting with the prefix
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most commonly associated with the selected compiler (that is,
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``gcc'' when using gcc, and ``llvm'' when using clang)
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- (machine-specifying) agnostic tools
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- (machine-speficying) branded tools, starting once again with the
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prefix most commonly associated with the selected compiler
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# native builds: default search order:
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- agnostic tools
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- machine-prefixed agnostic tools
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- machine-prefixed branded tools
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- branded tools
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# using an alternate search order:
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- --toolchain=<prefix> (e.g. --toolchain=llvm) --> search for tools
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that begin with <prefix> before searching for agnostic tools
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# restricting which tools may be searched:
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- --zealous --> only search for agnostic tools
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- --zealous=<prefix> --> only search for <prefix>-branded tools
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# per-tool overrides, by example of the ``ar'' tool:
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- AR=ar --> set AR to $(command -v ar)
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- AR=/path/to/ar --> set AR to the specified absolute path
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# host generated config file and variable names:
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- ccenv/host.mk
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- AR, NM, OBJDUMP, ...
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# native generated config file and variable names:
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- ccenv/native.mk
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- NATIVE_AR, NATIVE_NM, NATIVE_OBJDUMP, ...
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# distro: site-wide preferences
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- --ccenv=/path/to/site-specific/ccenv
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- use the above to create ccenv as a symlink to
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/path/to/site-specific/ccenv, and to accordingly
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skip configure's tool-finding step.
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