linux-kernel - [PATCH 7/7] Makefile: Build with -Werror=date-time if the compiler supports it

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Message-ID: <106ff2bbebe0c2c75bedf1c52a666d638b4dc20e.1387833347.git.josh@joshtriplett.org>
Date:	Mon, 23 Dec 2013 13:56:06 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Michal Marek <mmarek@...e.cz>, linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] 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: Josh Triplett <josh@...htriplett.org>
---
 Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile b/Makefile
index 14d592c..188eea7 100644
--- a/Makefile
+++ b/Makefile
@@ -668,6 +668,9 @@ 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)
 
-- 
1.8.5.2

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