https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65837
--- Comment #3 from prathamesh3492 at gcc dot gnu.org --- Hi, I tried to reproduce the error with a reduced test-case: #include "arm_neon.h" float32x2_t a, b, c, e; int main() { e = __builtin_neon_vmls_lanev2sf (a, b, c, 0); return 0; } arm-linux-gnueabihf-gcc -mfpu=neon test.c -flto test.c -c arm-linux-gnueabihf-gcc test.o -flto -o test lto1: fatal error: target specific builtin not available compilation terminated. lto-wrapper: fatal error: /home/prathamesh.kulkarni/gnu-toolchain/gcc-chromium-arm-linux-gnueabihf/builds/destdir/x86_64-unknown-linux-gnu/bin/arm-linux-gnueabihf-gcc returned 1 exit status compilation terminated. However passing -mfpu=neon for linking works: arm-linux-gnueabihf-gcc -mfpu=neon test.o -flto -o test I suppose similar thing must be happening during linking libshared_memory_support.so for chromium build ? I couldn't see -mfpu=neon in the command line used for linking libshared_memory_support.so Thank you, Prathamesh