-fipa-cp-clone and valgrind

[Ryan Hill <dirtyepic at gentoo dot org>]

I recently hit an error while building valgrind-3.4.0 with -O3 using
trunk (-r144460):

x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I..  -I../coregrind -I..
-I../coregrind/x86 -I../coregrind/linux -I../coregrind/x86-linux
-I../include -I../VEX/pub -DVG_PLATFORM="\"x86-linux\"" -DVGA_x86=1
-DVGO_linux=1 -DVGP_x86_linux=1 -DVG_LIBDIR="\"/usr/lib64/valgrind"\"
-m32 -fno-stack-protector -O2 -g -Wmissing-prototypes -Wall -Wshadow
-Wpointer-arith -Wstrict-prototypes -Wmissing-declarations
-Wno-format-zero-length -fno-strict-aliasing -O3 -march=core2 -pipe
-Wno-long-long -Wno-pointer-sign -Wdeclaration-after-statement
-fno-stack-protector -MT libcoregrind_x86_linux_a-m_libcassert.o -MD
-MP -MF .deps/libcoregrind_x86_linux_a-m_libcassert.Tpo -c -o
libcoregrind_x86_linux_a-m_libcassert.o `test -f 'm_libcassert.c' ||
echo

'./'`m_libcassert.c m_libcassert.c: Assembler messages:
m_libcassert.c:140: Error: symbol `m_libcassert_get_ip' is already
defined
make[3]: *** [libcoregrind_x86_linux_a-m_libcassert.o] Error 1
make[3]: Leaving directory
`/var/tmp/portage/dev-util/valgrind-3.4.0/work/valgrind-3.4.0/coregrind'      


The error was narrowed down to the use of -fipa-cp-clone.

The code in question is:

  48 #if defined(VGP_x86_linux)
  49 #  define GET_REAL_PC_SP_AND_FP(pc, sp, fp)      \
  50       asm("call m_libcassert_get_ip;" \
  51           "m_libcassert_get_ip: popl %0;" \
  52           "movl %%esp, %1;" \
  53           "movl %%ebp, %2;" \
  54           : "=r" (pc),\
  55             "=r" (sp),\
  56             "=r" (fp));


My question is, is this expected?  Is this a gcc bug, a valgrind bug,
or the natural result of me doing something silly like trying to
compile valgrind w/ -O3?

http://bugs.gentoo.org/show_bug.cgi?id=260802

also might be interesting: it seems this isn't the first time we've
encountered this: gcc-3.3.6 also gave this error when building w/ -O3,
but gcc-3.4.5 did not.

http://bugs.gentoo.org/show_bug.cgi?id=129776


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