http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49992
--- Comment #41 from Jack Howarth <howarth at nitro dot med.uc.edu> 2011-08-11
13:22:46 UTC ---
Note that I can also confirm the failure from Comment 4 on darwin11. Using
unpatched gcc trunk svn at r177665 when building with clang on darwin11
using...
../gcc-4.7-20110811/configure --prefix=/sw --prefix=/sw/lib/gcc4.7
--mandir=/sw/share/man --infodir=/sw/lib/gcc4.7/info
--enable-languages=c,c++,fortran,objc,obj-c++,java --with-gmp=/sw
--with-libiconv-prefix=/sw --with-ppl=/sw --with-cloog=/sw --with-mpc=/sw
--with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib
--program-suffix=-fsf-4.7 --enable-checking=release --enable-cloog-backend=isl
results in the linkage failure...
../../gcc-4.7-20110811/gcc/vegcc -g -fkeep-inline-functions -DIN_GCC -W
-Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes
-Wmissing-format-attribute -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Wold-style-definition -Wc++-compat -DHAVE_CONFIG_H
-o gengtype \
gengtype.o gengtype-lex.o gengtype-parse.o gengtype-state.o version.o
errors.o libcommon.a ../libcpp/libcpp.a ../libiberty/libiberty.a
../libdecnumber/libdecnumber.a libcommon.a ../libcpp/libcpp.a -lintl -L/sw/lib
-liconv ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a
...
ld: duplicate symbol _fancy_abort in libcommon.a(diagnostic.o) and errors.o for
architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [gengtype] Error 1
...
make[2]: *** [all-stage1-gcc] Error 2
make[1]: *** [stage1-bubble] Error 2
So we can not really ignore this PR as it breaks --enable-checking=release.
Note that lto is not required for this failure mode.
