[Buildroot] [PATCH] package: Add staging libraries paths in target LDFLAGS

[llandwerlin at gmail.com]

From: Lionel Landwerlin <llandwerlin at gmail.com>

Recently some problem have been raised about libtooled packages trying
to link with host's libraries. The problem is that at some point in
the compilation process, options like "-rpath /usr/lib" are added to
the link flags. It seems libtool add the -L$(DIR) if -rpath $(DIR).

The short term fix is to add the -L$(STAGING_DIR)/lib and
-L$(STAGING_DIR)/usr/lib options to TARGET_LDFLAGS variable (it's
already done for buildroot generated toolchains). This way, the linker
will look at $(STAGING_DIR)/* libraries paths first, and try to link
with them. It remains that the linker will fail if a "-L/usr/lib"
option is found before the "-L$(STAGING_DIR)/lib
-L$(STAGING_DIR)/usr/lib" options. Hopefully it's not the case.

The long term fix would be to teach libtool about sysroots, which is a
complicated task for many reasons.

Signed-off-by: Lionel Landwerlin <llandwerlin at gmail.com>
---
 package/Makefile.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/package/Makefile.in b/package/Makefile.in
index eab9168..d8c9ecb 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -92,7 +92,7 @@ endif
 else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
 TARGET_CFLAGS+=--sysroot $(STAGING_DIR)/
 TARGET_CXXFLAGS=$(TARGET_CFLAGS)
-TARGET_LDFLAGS=--sysroot $(STAGING_DIR)/
+TARGET_LDFLAGS=--sysroot $(STAGING_DIR)/ -L$(STAGING_DIR)/lib -L$(STAGING_DIR)/usr/lib
 endif
 #########################################################################
 
-- 
1.7.0.4