[Buildroot] [PATCH v9 05/11] core: add {TARGET, STAGING}_SANITIZE_RPATH_HOOK to TARGET_FINALIZE_HOOKS

[Samuel Martin]

This patch introduces the TARGET_SANITIZE_RPATH_HOOK and
STAGING_SANITIZE_RPATH_HOOK hooks fixing the ELF files' RPATH of
binaries from, respectively, the TARGET_DIR and the STAGING_DIR
locations.

It is a fair assumption that all target package has been built before
reaching the target-finalize target; hence the execution of these hooks
as TARGET_FINALIZE_HOOKS.

After running these hooks, the RPATH from any target ELF files from both
the target and the staging locations won't contain any occurrence of the
sysroot or some build locations.

Signed-off-by: Samuel Martin <s.martin49 at gmail.com>

---
changes v8->v9:
- none

changes v7->v8:
- none

changes v6->v7:
- remove the DEBUG env. var. specific handling in Makefile

changes v5->v6:
- update for the new script version
- add debug mode support

changes v4->v5:
- target hook now sanitizes the rpath (Baruch)
- add verbose support
- update comment

changes v3->v4:
- rebase
- add comment

changes v2->v3:
- move hook in Makefile (Baruch)
---
 Makefile | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Makefile b/Makefile
index 0c9bb98..e92826f 100644
--- a/Makefile
+++ b/Makefile
@@ -651,6 +651,24 @@ endef
 TARGET_FINALIZE_HOOKS += PURGE_LOCALES
 endif
 
+# Function sanitizing target/staging ELF files' RPATH.
+# i.e. it removes paths pointing to the staging or build location from the ELF
+# files' RPATH.
+define TARGET_SANITIZE_RPATH_HOOK
+	PATCHELF=$(HOST_DIR)/usr/bin/patchelf \
+	READELF=$(TARGET_READELF) \
+	$(TOPDIR)/support/scripts/fix-rpath target $(TARGET_DIR)
+endef
+
+define STAGING_SANITIZE_RPATH_HOOK
+	PATCHELF=$(HOST_DIR)/usr/bin/patchelf \
+	READELF=$(TARGET_READELF) \
+	$(TOPDIR)/support/scripts/fix-rpath staging $(STAGING_DIR)
+endef
+
+TARGET_FINALIZE_HOOKS += TARGET_SANITIZE_RPATH_HOOK \
+       STAGING_SANITIZE_RPATH_HOOK
+
 $(TARGETS_ROOTFS): target-finalize
 
 target-finalize: $(PACKAGES)
-- 
2.8.0