[Buildroot] [PATCH v2] package/gcc: map debug prefix when reproducible

From: John Keeping <john@metanate.com>
To: buildroot@buildroot.org
Cc: Romain Naour <romain.naour@gmail.com>,
	John Keeping <john@metanate.com>,
	Giulio Benetti <giulio.benetti@benettiengineering.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	"Yann E. MORIN" <yann.morin.1998@free.fr>
Subject: [Buildroot] [PATCH v2] package/gcc: map debug prefix when reproducible
Date: Tue,  7 Feb 2023 19:58:10 +0000	[thread overview]
Message-ID: <20230207195810.2016594-1-john@metanate.com> (raw)

When building with BR2_REPRODUCIBLE the toolchain wrapper passes
-fdebug-prefix-map for all packages that are built.  But this doesn't
affect the target libraries (like libgcc) built by GCC's build system.

GCC 4.3 added a configure option to set the debug prefix map for these
libraries, which is used here to avoid encoding potentially
non-reproducible build paths into the debug data.

Signed-off-by: John Keeping <john@metanate.com>
---
Changes since v1:
- Add the option to GCC common config, not just gcc-final

 package/gcc/gcc.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/gcc/gcc.mk b/package/gcc/gcc.mk
index ec6f3b550a..6dfd93f2a4 100644
--- a/package/gcc/gcc.mk
+++ b/package/gcc/gcc.mk
@@ -84,6 +84,10 @@ HOST_GCC_COMMON_CONF_OPTS = \
 	--with-bugurl="http://bugs.buildroot.net/" \
 	--without-zstd
 
+ifeq ($(BR2_REPRODUCIBLE),y)
+HOST_GCC_COMMON_CONF_OPTS += --with-debug-prefix-map=$(BASE_DIR)=buildroot
+endif
+
 # Don't build documentation. It takes up extra space / build time,
 # and sometimes needs specific makeinfo versions to work
 HOST_GCC_COMMON_CONF_ENV = \
-- 
2.39.1

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