[Buildroot] [git commit] toolchain/toolchain-wrapper: reproducible builds: handle debug info paths in GCC <7

[Buildroot] [git commit] toolchain/toolchain-wrapper: reproducible builds: handle debug info paths in GCC <7

[Arnout Vandecappelle]

commit: https://git.buildroot.net/buildroot/commit/?id=409e30a70fc28e05a11c903dc7918eee92e424d1
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

In GCC8 the flag -ffile-prefix-map handles cleaning up both the __FILE__
macros and the debug info paths. In GCC7 or below we are manually
handling the __FILE__ macros, but not debug info paths. Use
-fdebug-prefix-map to clean them up. This option exists since GCC 4.3.0,
which is our minimal supported GCC version.

See for more detail: https://reproducible-builds.org/docs/build-path/

Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
---
 toolchain/toolchain-wrapper.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/toolchain/toolchain-wrapper.mk b/toolchain/toolchain-wrapper.mk
index 8b551e3a18..bc8d77b892 100644
--- a/toolchain/toolchain-wrapper.mk
+++ b/toolchain/toolchain-wrapper.mk
@@ -26,6 +26,7 @@ TOOLCHAIN_WRAPPER_OPTS += -Wl,--build-id=none
 ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
 TOOLCHAIN_WRAPPER_OPTS += -ffile-prefix-map=$(BASE_DIR)=buildroot
 else
+TOOLCHAIN_WRAPPER_OPTS += -fdebug-prefix-map=$(BASE_DIR)=buildroot
 TOOLCHAIN_WRAPPER_OPTS += -D__FILE__=\"\" -D__BASE_FILE__=\"\" -Wno-builtin-macro-redefined
 endif
 ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),)
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