bslathi19/buildroot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

toolchain/toolchain-wrapper: let recent GCC handle SOURCE_DATE_EPOCH

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

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