From 499a718d986776354bbd4e7787ea1c30c851e384 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Aug 13 2018 23:26:24 +0000
Subject: driver: added --heuristics support.


---

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index fac022f..18fdc30 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -47,6 +47,7 @@ extern "C" {
 #define SLBT_DRIVER_SHARED		0x4000
 #define SLBT_DRIVER_STATIC		0x8000
 
+#define SLBT_DRIVER_HEURISTICS		0x010000
 #define SLBT_DRIVER_STRICT		0x020000
 #define SLBT_DRIVER_NO_UNDEFINED	0x040000
 #define SLBT_DRIVER_MODULE		0x080000
diff --git a/src/driver/slbt_driver_ctx.c b/src/driver/slbt_driver_ctx.c
index eac59c5..658b62b 100644
--- a/src/driver/slbt_driver_ctx.c
+++ b/src/driver/slbt_driver_ctx.c
@@ -14,6 +14,7 @@
 #include "slibtool_version.h"
 #include "slibtool_driver_impl.h"
 #include "slibtool_errinfo_impl.h"
+#include "slibtool_lconf_impl.h"
 #include "argv/argv.h"
 
 /* package info */
@@ -966,6 +967,8 @@ int slbt_get_driver_ctx(
 	struct argv_meta *		meta;
 	struct argv_entry *		entry;
 	const char *			program;
+	const char *			lconf;
+	uint64_t			lflags;
 
 	argv_optv_init(slbt_default_options,optv);
 
@@ -989,7 +992,9 @@ int slbt_get_driver_ctx(
 			fdctx->fderr)))
 		return -1;
 
+	lconf   = 0;
 	program = argv_program_name(argv[0]);
+
 	memset(&cctx,0,sizeof(cctx));
 
 	/* shared and static objects: enable by default, disable by ~switch */
@@ -1013,6 +1018,11 @@ int slbt_get_driver_ctx(
 					cctx.drvflags |= SLBT_DRIVER_VERSION;
 					break;
 
+				case TAG_HEURISTICS:
+					cctx.drvflags |= SLBT_DRIVER_HEURISTICS;
+					lconf = entry->arg;
+					break;
+
 				case TAG_MODE:
 					if (!strcmp("clean",entry->arg))
 						cctx.mode = SLBT_MODE_CLEAN;
@@ -1286,6 +1296,32 @@ int slbt_get_driver_ctx(
 	if (!(ctx = slbt_driver_ctx_alloc(meta,fdctx,&cctx)))
 		return slbt_get_driver_ctx_fail(meta);
 
+	/* heuristics */
+	if (cctx.drvflags & SLBT_DRIVER_HEURISTICS) {
+		if (slbt_get_lconf_flags(&ctx->ctx,lconf,&lflags) < 0) {
+			slbt_free_driver_ctx(&ctx->ctx);
+			return -1;
+		}
+
+		cctx.drvflags &= ~(uint64_t)SLBT_DRIVER_DISABLE_STATIC;
+		cctx.drvflags &= ~(uint64_t)SLBT_DRIVER_DISABLE_SHARED;
+
+		cctx.drvflags |= lflags;
+		cctx.drvflags |= SLBT_DRIVER_SHARED;
+		cctx.drvflags |= SLBT_DRIVER_STATIC;
+
+		/* -disable-static? */
+		if (cctx.drvflags & SLBT_DRIVER_DISABLE_STATIC)
+			cctx.drvflags &= ~(uint64_t)SLBT_DRIVER_STATIC;
+
+		/* -disable-shared? */
+		if (cctx.drvflags & SLBT_DRIVER_DISABLE_SHARED)
+			cctx.drvflags &= ~(uint64_t)SLBT_DRIVER_SHARED;
+
+		ctx->cctx.drvflags = cctx.drvflags;
+	}
+
+	/* ctx */
 	ctx->ctx.program	= program;
 	ctx->ctx.cctx		= &ctx->cctx;
 	ctx->targv		= sargv.targv;
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
index ab4ace1..451b1a6 100644
--- a/src/internal/slibtool_driver_impl.h
+++ b/src/internal/slibtool_driver_impl.h
@@ -62,6 +62,7 @@ enum app_tags {
 	TAG_NO_INSTALL,
 	TAG_PREFER_PIC,
 	TAG_PREFER_NON_PIC,
+	TAG_HEURISTICS,
 	TAG_SHARED,
 	TAG_STATIC,
 	TAG_ALL_STATIC,
diff --git a/src/skin/slbt_skin_default.c b/src/skin/slbt_skin_default.c
index ce8df6f..7678f2a 100644
--- a/src/skin/slbt_skin_default.c
+++ b/src/skin/slbt_skin_default.c
@@ -11,6 +11,12 @@ const struct argv_option slbt_default_options[] = {
 	{"help-all",		'h',TAG_HELP_ALL,ARGV_OPTARG_NONE,0,0,0,
 				"show comprehensive help information"},
 
+	{"heuristics",		0,TAG_HEURISTICS,ARGV_OPTARG_OPTIONAL,0,0,"<path>",
+				"enable/disable creation of shared/static libraries "
+				"by parsing a project-specific shell script, "
+				"the %s of which is either provided via this "
+				"command-line argument, or detected by the program."},
+
 	{"mode",		0,TAG_MODE,ARGV_OPTARG_REQUIRED,0,
 				"clean|compile|execute|finish"
 				"|install|link|uninstall",0,