linux-kernel - [PATCH 02/20] lto: Disable LTO for hweight functions

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Message-Id: <1392733738-8290-3-git-send-email-andi@firstfloor.org>
Date:	Tue, 18 Feb 2014 15:28:40 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	sam@...nborg.org, x86@...nel.org, linux-kbuild@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 02/20] lto: Disable LTO for hweight functions

From: Andi Kleen <ak@...ux.intel.com>

x86 calls the hweight library functions with special calling conventions.
LTO doesn't support compiling individual files with special options.
Just disable LTO for the file.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 lib/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Makefile b/lib/Makefile
index 48140e3..2057304 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -46,7 +46,9 @@ obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
 obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
 
 GCOV_PROFILE_hweight.o := n
-CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS))
+CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS)) \
+		   $(DISABLE_LTO)
+
 obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
 
 obj-$(CONFIG_BTREE) += btree.o
-- 
1.8.5.2

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