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toolchain/toolchain-wrapper: handle __{BASE_,}FILE__ macro for reproducibility

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Many tools use __FILE__ or __BASE_FILE__ for debugging and both
capture the build path. This results in non-reproducible images when
building in different directories.

If the config uses GCC 8 or above, we use -ffile-prefix-map=old=new
and let gcc take care of the path remapping in __FILE__. Since GCC
versions before v8 did not have this feature, we use an empty string
in that case, and disable the builtin-macro-redefined warning which
would otherwise trigger and cause build issues with -Werror.

Signed-off-by: Atharva Lele <itsatharva@gmail.com>
[Thomas:
 - as suggested by Arnout, use the empty string for the __FILE__ and
   __BASE_FILE__ value
 - as suggested by Romain, also handle __BASE_FILE__ in addition to
   __FILE__
 - pass -Wno-builtin-macro-redefined to avoid build errors when
   -Werror is passed]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Atharva Lele 2019-08-31 23:31:13 +05:30 committed by Thomas Petazzoni
parent 425f79087a
commit 71d6901454
1 changed files with 5 additions and 0 deletions
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5
toolchain/toolchain-wrapper.mk
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@ -23,6 +23,11 @@ TOOLCHAIN_WRAPPER_OPTS = \
ifeq ($(BR2_REPRODUCIBLE),y)
TOOLCHAIN_WRAPPER_OPTS += -Wl,--build-id=none
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
TOOLCHAIN_WRAPPER_OPTS += -ffile-prefix-map=$(BASE_DIR)=buildroot
else
TOOLCHAIN_WRAPPER_OPTS += -D__FILE__=\"\" -D__BASE_FILE__=\"\" -Wno-builtin-macro-redefined
endif
endif
# We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a