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

joshtriplett · michal42 · commit fe7c36c7bde1 · 2014-01-27T23:14:13.000+01:00
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 &lt;josh@joshtriplett.org&gt;
Signed-off-by: Michal Marek &lt;mmarek@suse.cz&gt;
diff --git a/Makefile b/Makefile
@@ -682,6 +682,9 @@ KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
 # require functions to have arguments in prototypes, not empty 'int foo()'
 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
 KBUILD_ARFLAGS := $(call ar-option,D)
 
