https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111231
--- Comment #10 from Mathieu Malaterre <malat at debian dot org> --- I could not reduce to a single *.cc file. The function needs to be in an alt file 'foo.cc'. So could someone please compare: g++ -std=c++11 -o works -O2 -g -Wfatal-errors -Werror -Wall -Wextra -Wconversion -DNDEBUG -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard -mfp16-format=ieee -Wno-psabi widen_mul_test.cc foo.cc with: g++ -std=c++11 -o fails -O2 -g -Wfatal-errors -DNDEBUG -fno-exceptions -march=armv7-a -mfpu=neon-vfpv4 -mfloat-abi=hard -mfp16-format=ieee -Wno-psabi widen_mul_test.cc foo.cc
