https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77773
--- Comment #1 from avieira at gcc dot gnu.org --- When I say without errors I meant without segfaulting. It will print out the following error for version 5 if you dont include '-mfpu=neon': t.c:1:9: error: '__simd64_float16_t' does not name a type typedef __simd64_float16_t float16x4_t;