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Makefile: Build with -Werror=date-time if the compiler supports it

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GCC 4.9 and newer have a new warning -Wdate-time, which warns on any use
of __DATE__, __TIME__, or __TIMESTAMP__, which would make the build
non-deterministic.  Now that the kernel does not use any of those
macros, turn on -Werror=date-time if available, to keep it that way.

The kernel already (optionally) records this information at build time
in a single place; other kernel code should not duplicate that.

Signed-off-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Josh Triplett 2013-12-23 13:56:06 -08:00 committed by Michal Marek
parent f9d7f7778c
commit fe7c36c7bd
1 changed files with 3 additions and 0 deletions
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Makefile
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@ -682,6 +682,9 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
# require functions to have arguments in prototypes, not empty 'int foo()' # require functions to have arguments in prototypes, not empty 'int foo()'
KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes) KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
# use the deterministic mode of AR if available # use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D) KBUILD_ARFLAGS := $(call ar-option,D)