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From effd0097f1b34616b410473493bd8eeb388835d8 Mon Sep 17 00:00:00 2001
From: Oliver Reiche <oliver.reiche@huawei.com>
Date: Mon, 21 Aug 2023 18:03:56 +0200
Subject: [PATCH 2/2] Compute reproducible checksums
... for variable toolchain paths:
* remove linker path from gcc's checksum-options
* disable thin archives (for stripping libbackend.a)
* strip debug info before computing checksums
For removing the linker path, the user needs to set
"BUILD_ROOT_DIR" before building.
---
gcc/Makefile.in | 3 ++-
gcc/c/Make-lang.in | 6 +++++-
gcc/cp/Make-lang.in | 6 +++++-
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 5d05e8e0d..1346bbe72 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -284,7 +284,7 @@ USE_THIN_ARCHIVES = no
ifeq ($(THIN_ARCHIVE_SUPPORT),yes)
ifeq ($(AR_FLAGS),rc)
ifeq ($(RANLIB_FLAGS),)
-USE_THIN_ARCHIVES = yes
+#USE_THIN_ARCHIVES = yes
endif
endif
endif
@@ -2075,6 +2075,7 @@ gcc-cross$(exeext): xgcc$(exeext)
checksum-options:
echo "$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS)" > checksum-options.tmp \
+ && sed -i 's|'$${BUILD_ROOT_DIR:-/nonexistent}'|/build|g' checksum-options.tmp \
&& $(srcdir)/../move-if-change checksum-options.tmp checksum-options
#
diff --git a/gcc/c/Make-lang.in b/gcc/c/Make-lang.in
index 8944b9b9f..7ed444c5f 100644
--- a/gcc/c/Make-lang.in
+++ b/gcc/c/Make-lang.in
@@ -76,7 +76,11 @@ cc1-checksum.c : build/genchecksum$(build_exeext) checksum-options \
&& cmp -s ../stage_current ../stage_final; then \
cp ../prev-gcc/cc1-checksum.c cc1-checksum.c; \
else \
- build/genchecksum$(build_exeext) $(C_OBJS) $(BACKEND) $(LIBDEPS) \
+ rm -rf stripped_c_checksum_inputs; \
+ mkdir stripped_c_checksum_inputs; \
+ cp $(C_OBJS) $(BACKEND) $(LIBDEPS) stripped_c_checksum_inputs/; \
+ $(STRIP_FOR_TARGET) -g stripped_c_checksum_inputs/*; \
+ build/genchecksum$(build_exeext) $$(ls stripped_c_checksum_inputs/* | LC_ALL=C sort) \
checksum-options > cc1-checksum.c.tmp && \
$(srcdir)/../move-if-change cc1-checksum.c.tmp cc1-checksum.c; \
fi
diff --git a/gcc/cp/Make-lang.in b/gcc/cp/Make-lang.in
index 7896591dd..c65afcb85 100644
--- a/gcc/cp/Make-lang.in
+++ b/gcc/cp/Make-lang.in
@@ -111,7 +111,11 @@ cc1plus-checksum.c : build/genchecksum$(build_exeext) checksum-options \
&& cmp -s ../stage_current ../stage_final; then \
cp ../prev-gcc/cc1plus-checksum.c cc1plus-checksum.c; \
else \
- build/genchecksum$(build_exeext) $(CXX_OBJS) $(BACKEND) $(LIBDEPS) \
+ rm -rf stripped_cp_checksum_inputs; \
+ mkdir stripped_cp_checksum_inputs; \
+ cp $(CXX_OBJS) $(BACKEND) $(CODYLIB) $(LIBDEPS) stripped_cp_checksum_inputs; \
+ $(STRIP_FOR_TARGET) -g stripped_cp_checksum_inputs/*; \
+ build/genchecksum$(build_exeext) $$(ls stripped_cp_checksum_inputs/* | LC_ALL=C sort) \
checksum-options > cc1plus-checksum.c.tmp && \
$(srcdir)/../move-if-change cc1plus-checksum.c.tmp cc1plus-checksum.c; \
fi
--
2.30.2
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