http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53266
Bug #: 53266
Summary: Error: Unrecognized opcode: `mulhwu'
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: sk...@iskunk.org
Host: powerpc-ibm-aix4.3.2.0
Target: powerpc-ibm-aix4.3.2.0
Build: powerpc-ibm-aix4.3.2.0
Bootstrapping GCC 4.7.0 on AIX 4.3 fails with
[...]
gmake[3]: Entering directory `/tmp/gcc-build/powerpc-ibm-aix4.3.2.0/libgcc'
# If this is the top-level multilib, build all the other
# multilibs.
DEFINES='' HEADERS='' \
/home/src/gcc-4.7.0/libgcc/mkheader.sh > tmp-libgcc_tm.h
/opt/freeware/bin/bash /home/src/gcc-4.7.0/libgcc/../move-if-change
tmp-libgcc_tm.h libgcc_tm.h
echo timestamp > libgcc_tm.stamp
/tmp/gcc-build/./gcc/xgcc -B/tmp/gcc-build/./gcc/
-B/opt/tg/powerpc-ibm-aix4.3.2.0/bin/ -B/opt/tg/powerpc-ibm-aix4.3.2.0/lib/
-isystem /opt/tg/powerpc-ibm-aix4.3.2.0/include -isystem
/opt/tg/powerpc-ibm-aix4.3.2.0/sys-include -g -O2 -O2 -g -O2 -DIN_GCC -W
-Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -isystem ./include -mlong-double-128 -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector -mlong-double-128 -I. -I.
-I../.././gcc -I/home/src/gcc-4.7.0/libgcc -I/home/src/gcc-4.7.0/libgcc/.
-I/home/src/gcc-4.7.0/libgcc/../gcc -I/home/src/gcc-4.7.0/libgcc/../include
-DHAVE_CC_TLS -DUSE_EMUTLS -o _muldi3.o -MT _muldi3.o -MD -MP -MF _muldi3.dep
-DL_muldi3 -c /home/src/gcc-4.7.0/libgcc/libgcc2.c
/tmp//cczJLmgC.s: Assembler messages:
/tmp//cczJLmgC.s:379: Error: Unrecognized opcode: `mulhwu'
gmake[3]: *** [_muldi3.o] Error 1
gmake[3]: Leaving directory `/tmp/gcc-build/powerpc-ibm-aix4.3.2.0/libgcc'
gmake[2]: *** [all-stage1-target-libgcc] Error 2
gmake[2]: Leaving directory `/tmp/gcc-build'
gmake[1]: *** [stage1-bubble] Error 2
gmake[1]: Leaving directory `/tmp/gcc-build'
gmake: *** [bootstrap-lean] Error 2
It appears to be the same issue as reported in a comment long ago:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12691#c2
My error was obtained using --with-gnu-as and --disable-multilib.
After some experimentation, I got rid of --disable-multilib, and configured the
tree with --with-cpu=powerpc --disable-aix64 --disable-powercpu, which allowed
the bootstrap to proceed without the above error. However, given that
build=host=target, and that the system triplet explicitly denotes a 32-bit
PowerPC processor, the configuration phase should have detected the need to
avoid unsupported instructions on its own.
