https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77773
--- Comment #3 from avieira at gcc dot gnu.org --- Just to make it clear: The command I showed without the '-g' did use to error on gcc-5, but it doesnt on 6 and 7: $ gcc-5/arm-none-eabi-g++ -S t.c -mfloat-abi=hard -march=armv7-a t.c:1:9: error: '__simd64_float16_t' does not name a type typedef __simd64_float16_t float16x4_t; $ gcc-6/arm-none-eabi-g++ -S t.c -mfloat-abi=hard -march=armv7-a $ gcc-7/arm-none-eabi-g++ -S t.c -mfloat-abi=hard -march=armv7-a Adding -mfpu=neon to gcc-5 gets rid of the error: $ gcc-5/arm-none-eabi-g++ -S t.c -mfloat-abi=hard -march=armv7-a -mfpu=neon Adding -mfpu=neon to eitehr gcc-6 or 7 is irrelevant to both compilations with or without '-g'.
