From 2baf1cc107ba6041a3856b77d33140ac876ad6f0 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Thu, 21 Jun 2018 09:50:26 -0400
Subject: link mode: --disable-{shared|static}: use differently-named
 placeholders.

---
 src/internal/slibtool_symlink_impl.c | 44 ++++++++++++++++++++++++++++++++----
 src/internal/slibtool_symlink_impl.h |  2 ++
 src/logic/slbt_exec_install.c        |  8 +++----
 src/logic/slbt_exec_link.c           |  4 +---
 4 files changed, 46 insertions(+), 12 deletions(-)

diff --git a/src/internal/slibtool_symlink_impl.c b/src/internal/slibtool_symlink_impl.c
index 72d693a..b5b9b28 100644
--- a/src/internal/slibtool_symlink_impl.c
+++ b/src/internal/slibtool_symlink_impl.c
@@ -11,6 +11,7 @@
 
 #include "slibtool_errinfo_impl.h"
 #include "slibtool_symlink_impl.h"
+#include "slibtool_readlink_impl.h"
 
 #define SLBT_DEV_NULL_FLAGS	(SLBT_DRIVER_ALL_STATIC      \
 				| SLBT_DRIVER_DISABLE_SHARED \
@@ -29,19 +30,29 @@ int slbt_create_symlink(
 	char *		dotdot;
 	char		tmplnk [PATH_MAX];
 	char		lnkarg [PATH_MAX];
+	char		alnkarg[PATH_MAX];
 	char		atarget[PATH_MAX];
+	char *		suffix = 0;
 
-	/* atarget */
+	/* symlink is a placeholder? */
 	if ((dctx->cctx->drvflags & SLBT_DEV_NULL_FLAGS)
-			&& !strcmp(target,"/dev/null"))
-		slash = target;
-	else if ((slash = strrchr(target,'/')))
+			&& !strcmp(target,"/dev/null")) {
+		slash  = target;
+		suffix = ".disabled";
+
+	/* symlink target contains a dirname? */
+	} else if ((slash = strrchr(target,'/'))) {
 		slash++;
-	else
+
+	/* symlink target is a basename */
+	} else {
 		slash = target;
+	}
 
+	/* .la wrapper? */
 	dotdot = flawrapper ? "../" : "";
 
+	/* atarget */
 	if ((size_t)snprintf(atarget,sizeof(atarget),"%s%s",
 			dotdot,slash) >= sizeof(atarget))
 		return SLBT_BUFFER_ERROR(dctx);
@@ -51,6 +62,12 @@ int slbt_create_symlink(
 			lnkname) >= sizeof(tmplnk))
 		return SLBT_BUFFER_ERROR(dctx);
 
+	/* placeholder? */
+	if (suffix) {
+		sprintf(alnkarg,"%s%s",lnkname,suffix);
+		lnkname = alnkarg;
+	}
+
 	/* lnkarg */
 	strcpy(lnkarg,lnkname);
 
@@ -90,3 +107,20 @@ int slbt_create_symlink(
 		? SLBT_SYSTEM_ERROR(dctx)
 		: 0;
 }
+
+int slbt_symlink_is_a_placeholder(char * lnkpath)
+{
+	size_t		len;
+	char		slink [PATH_MAX];
+	char		target[PATH_MAX];
+	const char	suffix[] = ".disabled";
+
+	if ((sizeof(slink)-sizeof(suffix)) < (len=strlen(lnkpath)))
+		return 0;
+
+	memcpy(slink,lnkpath,len);
+	memcpy(&slink[len],suffix,sizeof(suffix));
+
+	return (!slbt_readlink(slink,target,sizeof(target)))
+		&& (!strcmp(target,"/dev/null"));
+}
diff --git a/src/internal/slibtool_symlink_impl.h b/src/internal/slibtool_symlink_impl.h
index 63a74a8..b96fdb9 100644
--- a/src/internal/slibtool_symlink_impl.h
+++ b/src/internal/slibtool_symlink_impl.h
@@ -13,3 +13,5 @@ int slbt_create_symlink(
 	const char *			target,
 	const char *			lnkname,
 	bool				flawrapper);
+
+int slbt_symlink_is_a_placeholder(char * lnkpath);
diff --git a/src/logic/slbt_exec_install.c b/src/logic/slbt_exec_install.c
index ea795e3..2d98881 100644
--- a/src/logic/slbt_exec_install.c
+++ b/src/logic/slbt_exec_install.c
@@ -424,6 +424,10 @@ static int slbt_exec_install_entry(
 
 	/* source (build) symlink target */
 	if (slbt_readlink(slnkname,target,sizeof(target)) < 0) {
+		/* -all-static? */
+		if (slbt_symlink_is_a_placeholder(slnkname))
+			return 0;
+
 		/* -avoid-version? */
 		if (stat(slnkname,&st))
 			return SLBT_SYSTEM_ERROR(dctx);
@@ -447,10 +451,6 @@ static int slbt_exec_install_entry(
 		return 0;
 	}
 
-	/* -all-static? */
-	if (!strcmp(target,"/dev/null"))
-		return 0;
-
 	/* srcfile: .libs/libfoo.so.x.y.z */
 	slash = strrchr(srcfile,'/');
 	strcpy(++slash,target);
diff --git a/src/logic/slbt_exec_link.c b/src/logic/slbt_exec_link.c
index 542448c..5cf3355 100644
--- a/src/logic/slbt_exec_link.c
+++ b/src/logic/slbt_exec_link.c
@@ -200,7 +200,6 @@ static int slbt_adjust_linker_argument(
 	char *	slash;
 	char *	dot;
 	char	base[PATH_MAX];
-	char	slnk[PATH_MAX];
 
 	if (*arg == '-')
 		return 0;
@@ -229,8 +228,7 @@ static int slbt_adjust_linker_argument(
 	if (fpic) {
 		sprintf(dot,"%s",dsosuffix);
 
-		if (!slbt_readlink(arg,slnk,sizeof(slnk))
-				&& !(strcmp(slnk,"/dev/null")))
+		if (slbt_symlink_is_a_placeholder(arg))
 			sprintf(dot,"%s",arsuffix);
 		else if ((fdlib = open(arg,O_RDONLY)) >= 0)
 			close(fdlib);
-- 
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