[Bug target/65837] [arm-linux-gnueabihf] lto1 target specific builtin not available

["rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65837

--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to prathamesh3492 from comment #3)
> 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

this should still work according to my experiments.  -mfpu=neon should
be passed to lto1 at link time - can you verify it's in the lto option
section in test.o and on lto1 (by adding -v)?

> 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