[Buildroot] [PATCH v8 07/14] toolchain: add post-install hooks making the toolchain relocatable

[Samuel Martin]

This change adds the required dependency and post-target-install hooks
to render the toolchain relocatable.

Notes:
- Although the toolchain package is a virtual package, it does support
  hooks.
- This has to be post-target-install hooks because the toolchain package
  is handled as a "target" package.

Ultimately, this patch allows to generate relocatable toolchains, just
by doing:

  $ make menuconfig
  $ make toolchain

Then, this toolchain can be used/shared/deployed anywhere*.

*: on any Linux system with an ABI-compatible set of system libraries
   (usually including: glibc, libgcc, zlib, flex and libsigsegv).

Signed-off-by: Samuel Martin <s.martin49 at gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Cc: Peter Korsgaard <peter at korsgaard.com>

---
changes v7->v8:
- none

changes v6->v7:
- new patch
---
 toolchain/toolchain/toolchain.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/toolchain/toolchain/toolchain.mk b/toolchain/toolchain/toolchain.mk
index c22713b..618aa64 100644
--- a/toolchain/toolchain/toolchain.mk
+++ b/toolchain/toolchain/toolchain.mk
@@ -12,6 +12,11 @@ endif
 
 TOOLCHAIN_ADD_TOOLCHAIN_DEPENDENCY = NO
 
+# dependency and hooks needed to make the toolchain relocatable
+TOOLCHAIN_DEPENDENCIES += host-patchelf
+TOOLCHAIN_POST_INSTALL_TARGET_HOOKS += HOST_SANITIZE_RPATH_HOOK \
+	STAGING_SANITIZE_RPATH_HOOK
+
 $(eval $(virtual-package))
 
 toolchain: $(HOST_DIR)/usr/share/buildroot/toolchainfile.cmake
-- 
2.8.0