From: Josh Triplett <josh@joshtriplett.org>
To: Michal Marek <mmarek@suse.cz>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 7/7] Makefile: Build with -Werror=date-time if the compiler supports it
Date: Mon, 23 Dec 2013 13:56:06 -0800 [thread overview]
Message-ID: <106ff2bbebe0c2c75bedf1c52a666d638b4dc20e.1387833347.git.josh@joshtriplett.org> (raw)
In-Reply-To: <cover.1387833347.git.josh@joshtriplett.org>
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>
---
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
next prev parent reply other threads:[~2013-12-23 21:56 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-23 21:54 [PATCH 0/7] Eliminate uses of __DATE__ and __TIME__ Josh Triplett
2013-12-23 21:54 ` [PATCH 1/7] mtd: denali: Drop print of build date/time Josh Triplett
2013-12-26 8:24 ` Jingoo Han
2013-12-26 8:24 ` Jingoo Han
2014-01-09 16:55 ` Brian Norris
2014-01-09 16:55 ` Brian Norris
2013-12-23 21:55 ` [PATCH 2/7] net: wireless: brcm80211: Drop debug version with " Josh Triplett
2013-12-23 21:55 ` [PATCH 3/7] staging: rtl8188eu: Drop print of " Josh Triplett
2013-12-24 1:15 ` Larry Finger
2013-12-23 21:55 ` [PATCH 4/7] staging: rts5139: Drop print of build time Josh Triplett
2013-12-23 21:55 ` [PATCH 5/7] staging: wlags49_h2: Drop debug macro recording build date/time Josh Triplett
2013-12-23 21:55 ` [PATCH 6/7] x86: math-emu: Drop already-disabled print of build date Josh Triplett
2013-12-23 21:56 ` Josh Triplett [this message]
2014-01-03 16:40 ` [PATCH 7/7] Makefile: Build with -Werror=date-time if the compiler supports it Michal Marek
2014-01-03 20:29 ` Josh Triplett
2014-01-03 20:55 ` Michal Marek
2014-01-03 21:00 ` Josh Triplett
2014-01-14 20:56 ` Michal Marek
2014-01-14 21:40 ` Josh Triplett
2014-01-14 21:46 ` Greg KH
2014-01-27 22:57 ` Michal Marek
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