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toolchain/toolchain-wrapper: reproducible builds: omit absolute paths from debug symbols

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In GCC6 the compiler was made smarter to omit the flag
-fdebug-prefix-map from the DWARF DW_AT_producer section[1]. That flag
contains the absolute path '$(BASE_DIR)' which breaks reproducibility.
Prior to GCC6 however, the only way to omit the flag is to use
-gno-record-gcc-switches which omits all flags.

[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=266cc0c181549c2fb6b50f8f26213cdc89101026

Signed-off-by: Brandon Maier <brandon.maier@rockwellcollins.com>
[Arnout: invert condition to ifeq (,) instead of ifneq (,y)]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
This commit is contained in:
Brandon Maier 2020-04-15 17:00:32 -05:00 committed by Arnout Vandecappelle (Essensium/Mind)
parent 409e30a70f
commit 7ec9b3abd9
1 changed files with 3 additions and 0 deletions
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toolchain/toolchain-wrapper.mk
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@ -32,6 +32,9 @@ endif
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),)
TOOLCHAIN_WRAPPER_OPTS += -DBR_NEED_SOURCE_DATE_EPOCH
endif
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_6),)
TOOLCHAIN_WRAPPER_OPTS += -gno-record-gcc-switches
endif
endif
# Disable -ftree-loop-distribute-patterns on microblaze to