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[U-Boot,5/5] kbuild: build with -Werror=date-time if the compiler supports it

Message ID 1397721632-18797-6-git-send-email-yamada.m@jp.panasonic.com
State Superseded
Delegated to: Tom Rini
Headers show

Commit Message

Masahiro Yamada April 17, 2014, 8 a.m. UTC
This commit has been imported from Linux Kernel:

    commit fe7c36c7bde12190341722af69358e42171162f3
    Author: Josh Triplett <josh@joshtriplett.org>
    Date:   Mon Dec 23 13:56:06 2013 -0800

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

    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: Masahiro Yamada <yamada.m@jp.panasonic.com>
---

 Makefile | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/Makefile b/Makefile
index 0191869..09a370f 100644
--- a/Makefile
+++ b/Makefile
@@ -578,6 +578,9 @@  KBUILD_AFLAGS += -Wa,-gstabs,-S
 endif
 endif
 
+# Prohibit date/time macros, which would make the build non-deterministic
+KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
+
 ifneq ($(CONFIG_SYS_TEXT_BASE),)
 KBUILD_CPPFLAGS += -DCONFIG_SYS_TEXT_BASE=$(CONFIG_SYS_TEXT_BASE)
 endif