From 17e18afed34675d6f9e3aef91ddea8d84c1d1617 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Wed, 5 May 2021 16:20:44 +0000
Subject: driver: added explicit --sysroot support.

---
 include/slibtool/slibtool.h         |  1 +
 src/driver/slbt_driver_ctx.c        | 46 +++++++++++++++++++++++++++++++++++--
 src/internal/slibtool_driver_impl.h |  1 +
 src/skin/slbt_skin_default.c        |  4 ++++
 4 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/include/slibtool/slibtool.h b/include/slibtool/slibtool.h
index b10698a..6b64cd3 100644
--- a/include/slibtool/slibtool.h
+++ b/include/slibtool/slibtool.h
@@ -252,6 +252,7 @@ struct slbt_common_ctx {
 	const char *			output;
 	const char *			shrext;
 	const char *			rpath;
+	const char *			sysroot;
 	const char *			release;
 	const char *			symfile;
 	const char *			regex;
diff --git a/src/driver/slbt_driver_ctx.c b/src/driver/slbt_driver_ctx.c
index 37d5660..02b0617 100644
--- a/src/driver/slbt_driver_ctx.c
+++ b/src/driver/slbt_driver_ctx.c
@@ -277,6 +277,7 @@ static int slbt_split_argv(
 	int				argc;
 	const char *			program;
 	char *				compiler;
+	char *				csysroot;
 	char **				dargv;
 	char **				targv;
 	char **				cargv;
@@ -377,6 +378,8 @@ static int slbt_split_argv(
 	else if (!(sargv->dargs = calloc(1,size+1)))
 		return -1;
 
+	csysroot = 0;
+
 	for (i=0,flast=false,dargv=sargv->dargv,dst=sargv->dargs; i<argc; i++) {
 		if ((fcopy = flast)) {
 			(void)0;
@@ -441,6 +444,22 @@ static int slbt_split_argv(
 			*dst++ = 'L';
 			strcpy(dst,&argv[i][15]);
 			dst += strlen(dst)+1;
+
+		} else if (!strcmp(argv[i],"--sysroot") && (i<ctx.unitidx)) {
+			*dargv++ = dst;
+			csysroot = dst;
+			strcpy(dst,argv[i]);
+			dst[9] = '=';
+			strcpy(&dst[10],argv[++i]);
+			dst += strlen(dst)+1;
+			ctx.unitidx--;
+
+		} else if (!strncmp(argv[i],"--sysroot=",10) && (i<ctx.unitidx)) {
+			*dargv++ = dst;
+			csysroot = dst;
+			strcpy(dst,argv[i]);
+			dst += strlen(dst)+1;
+
 		} else {
 			fcopy = true;
 		}
@@ -456,8 +475,8 @@ static int slbt_split_argv(
 	argc = dargv - sargv->dargv;
 	argv = sargv->dargv;
 
-	/* allocate split vectors */
-	if ((sargv->targv = calloc(2*(argc+2),sizeof(char *))))
+	/* allocate split vectors, account for cargv's added sysroot */
+	if ((sargv->targv = calloc(2*(argc+3),sizeof(char *))))
 		sargv->cargv = sargv->targv + argc + 2;
 	else
 		return -1;
@@ -502,6 +521,14 @@ static int slbt_split_argv(
 	for (optout=optv; optout[0]->tag != TAG_OUTPUT; optout++)
 		(void)0;
 
+	/* compiler */
+	*cargv++ = argv[i++];
+
+	/* sysroot */
+	if (csysroot)
+		*cargv++ = csysroot;
+
+	/* remaining vector */
 	for (; i<argc; i++) {
 		if (argv[i][0] != '-') {
 			if (argv[i+1] && (argv[i+1][0] == '+')
@@ -545,6 +572,17 @@ static int slbt_split_argv(
 			*cargv++ = argv[i];
 			*targv++ = argv[i];
 
+		} else if (!(strncmp("-sysroot=",&argv[i][1],9))) {
+			*cargv++ = argv[i];
+			*targv++ = argv[i];
+
+		} else if (!(strcmp("-sysroot",&argv[i][1]))) {
+			*cargv++ = argv[i];
+			*targv++ = argv[i++];
+
+			*cargv++ = argv[i];
+			*targv++ = argv[i];
+
 		} else if (!(strcmp("bindir",&argv[i][1]))) {
 			*targv++ = argv[i++];
 			*targv++ = argv[i];
@@ -1543,6 +1581,10 @@ int slbt_get_driver_ctx(
 					cctx.rpath = entry->arg;
 					break;
 
+				case TAG_SYSROOT:
+					cctx.sysroot = entry->arg;
+					break;
+
 				case TAG_RELEASE:
 					cctx.release = entry->arg;
 					break;
diff --git a/src/internal/slibtool_driver_impl.h b/src/internal/slibtool_driver_impl.h
index 120c2e3..c70c334 100644
--- a/src/internal/slibtool_driver_impl.h
+++ b/src/internal/slibtool_driver_impl.h
@@ -51,6 +51,7 @@ enum app_tags {
 	TAG_LDRPATH,
 	TAG_SHREXT,
 	TAG_RPATH,
+	TAG_SYSROOT,
 	TAG_RELEASE,
 	TAG_DLOPEN,
 	TAG_DLPREOPEN,
diff --git a/src/skin/slbt_skin_default.c b/src/skin/slbt_skin_default.c
index 5533b04..b499101 100644
--- a/src/skin/slbt_skin_default.c
+++ b/src/skin/slbt_skin_default.c
@@ -161,6 +161,10 @@ const struct argv_option slbt_default_options[] = {
 				"where a library should eventually be "
 				"installed, relative to $(DESTDIR)$(PREFIX)"},
 
+	{"sysroot",		0,TAG_SYSROOT,ARGV_OPTARG_REQUIRED,0,0,"<sysroot>",
+				"an absolute sysroot path to pass to the compiler "
+				"or linker driver"},
+
 	{"release",		0,TAG_RELEASE,ARGV_OPTARG_REQUIRED,
 				ARGV_OPTION_HYBRID_ONLY|ARGV_OPTION_HYBRID_SPACE,0,0,
 				"specify release information; this will result "
-- 
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