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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2008-06-21 03:26:21 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-20 16:46:10 -0700
commitede426923b25414f5ec9c00fefe6727d9721dd13 (patch)
tree201a873e852807d0b5a02503eecd39a45338be94 /arch/alpha/Makefile
parent9267b4b3880d00dc2dab90f1d817c856939114f7 (diff)
downloadlinux-ede426923b25414f5ec9c00fefe6727d9721dd13.tar.gz
alpha: link failure fix
With built-in scsi disk driver, the final link fails with a following error: `.exit.text' referenced in section `.rodata' of drivers/built-in.o: defined in discarded section `.exit.text' of drivers/built-in.o This happens with -Os (CONFIG_CC_OPTIMIZE_FOR_SIZE=y) with all gcc-4 versions, and also with -O2 and gcc-4.3. The problem is in sd.c:sd_major() being inlined into __exit function exit_sd(), and the compiler generating a jump table in .rodata section for the 'switch' statement in sd_major(). So we have references to discarded section. Fixed with a big hammer in the form of -fno-jump-tables. Note that jump tables vs. discarded sections is a generic problem, other architectures are just lucky not to suffer from it. But with a slightly more complex switch/case statement it can be reproduced on x86 as well. So maybe at some point we should consider -fno-jump-tables as a generic compile option... Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/alpha/Makefile')
-rw-r--r--arch/alpha/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/alpha/Makefile b/arch/alpha/Makefile
index 4e1a8e2c4541..4759fe751aa1 100644
--- a/arch/alpha/Makefile
+++ b/arch/alpha/Makefile
@@ -13,6 +13,7 @@ NM := $(NM) -B
LDFLAGS_vmlinux := -static -N #-relax
CHECKFLAGS += -D__alpha__ -m64
cflags-y := -pipe -mno-fp-regs -ffixed-8 -msmall-data
+cflags-y += $(call cc-option, -fno-jump-tables)
cpuflags-$(CONFIG_ALPHA_EV4) := -mcpu=ev4
cpuflags-$(CONFIG_ALPHA_EV5) := -mcpu=ev5