https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66448
--- Comment #7 from Iain Sandoe <iains at gcc dot gnu.org> --- Created attachment 35717 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35717&action=edit pre-proc file for ipa-pure-const.c svn rev. 224236 + patch to defer declaration of the extern. If this is an issue with alias support / no alias support, ISTR that Honza has some trick to turn it off on Linux which makes testing easier. --- c/l /GCC/ml/gcc-trunk-apple/./prev-gcc/xg++ -B/GCC/ml/gcc-trunk-apple/./prev-gcc/ -B/compilers/gcc-trunk/x86_64-apple-darwin12/bin/ -nostdinc++ -B/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/src/.libs -B/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/libsupc++/.libs -I/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/include/x86_64-apple-darwin12 -I/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/include -I/GCC/gcc-trunk/libstdc++-v3/libsupc++ -L/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/src/.libs -L/GCC/ml/gcc-trunk-apple/prev-x86_64-apple-darwin12/libstdc++-v3/libsupc++/.libs -fno-PIE -c -g -O2 -gtoggle -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -I. -I. -I/GCC/gcc-trunk/gcc -I/GCC/gcc-trunk/gcc/. -I/GCC/gcc-trunk/gcc/../include -I./../intl -I/GCC/gcc-trunk/gcc/../libcpp/include -I/host/clang42//include -I/GCC/gcc-trunk/gcc/../libdecnumber -I/GCC/gcc-trunk/gcc/../libdecnumber/dpd -I../libdecnumber -I/GCC/gcc-trunk/gcc/../libbacktrace -I/host/clang42/include -o ipa-pure-const.o -MT ipa-pure-const.o -MMD -MP -MF ./.deps/ipa-pure-const.TPo /GCC/gcc-trunk/gcc/ipa-pure-const.c -save-temps -- response. /GCC/gcc-trunk/gcc/ipa-pure-const.c:1640:1: error: ‘{anonymous}::pass_ipa_pure_const::pass_ipa_pure_const(gcc::context*)’ defined but not used [-Werror=unused-function] pass_ipa_pure_const::pass_ipa_pure_const(gcc::context *ctxt)
