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toolchain/toolchain-wrapper: let recent GCC handle SOURCE_DATE_EPOCH

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When using precompiled headers, changing any macros defined on the
command line will invalidate the precompiled header.  With
toolchain-wrapper adding __DATE__ and __TIME__, any commits to Buildroot
will invalidate incremental builds regardless of whether the precompiled
header actually uses those values (affecting _OVERRIDE_SRCDIR).

GCC-7 and later support SOURCE_DATE_EPOCH and use it to define __DATE__
and __TIME__ internally, avoiding any impact on precompiled headers.

Disable the custom handling in toolchain-wrapper if GCC is version 7 or
newer.

Signed-off-by: John Keeping <john@metanate.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
John Keeping 2020-06-26 16:49:27 +01:00 committed by Thomas Petazzoni
parent 8c393d2c6f
commit 408bc354a9
2 changed files with 13 additions and 0 deletions
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10
toolchain/toolchain-wrapper.c
View File

@ -179,6 +179,7 @@ static void check_unsafe_path(const char *arg,
}
}
#ifdef BR_NEED_SOURCE_DATE_EPOCH
/* Returns false if SOURCE_DATE_EPOCH was not defined in the environment.
*
* Returns true if SOURCE_DATE_EPOCH is in the environment and represent
@ -232,6 +233,15 @@ bool parse_source_date_epoch_from_env(void)
}
return true;
}
#else
bool parse_source_date_epoch_from_env(void)
{
/* The compiler is recent enough to handle SOURCE_DATE_EPOCH itself
* so we do not need to do anything here.
*/
return false;
}
#endif
int main(int argc, char **argv)
{

3
toolchain/toolchain-wrapper.mk
View File

@ -28,6 +28,9 @@ TOOLCHAIN_WRAPPER_OPTS += -ffile-prefix-map=$(BASE_DIR)=buildroot
else
TOOLCHAIN_WRAPPER_OPTS += -D__FILE__=\"\" -D__BASE_FILE__=\"\" -Wno-builtin-macro-redefined
endif
ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_7),)
TOOLCHAIN_WRAPPER_OPTS += -DBR_NEED_SOURCE_DATE_EPOCH
endif
endif
# We create a list like '"-mfoo", "-mbar", "-mbarfoo"' so that each flag is a