Issue with undefined reference with assembler in rr

[Dave Johansen <davejohansen@xxxxxxxxx>]

I was working on packaging rr [1] and one of the tests [2] fails to build when optimizations are turned on. I've reduced it to the following and still been able to reproduce the issue:

static const float xmm0 = 10;

int main() {
  __asm__ __volatile__(
#if __i386__
      "movss xmm0, %xmm0\n\t"
#elif __x86_64__
      "movss xmm0(%rip), %xmm0\n\t"
#else
#error unexpected architecture
#endif
      );

  return 0;
}

Here's the output on F23 x86_64:
$ gcc fxregs.c -O0
$ gcc fxregs.c -O1
/tmp/cccdze3O.o: In function `main':
fxregs.c:(.text+0x4): undefined reference to `xmm0'
collect2: error: ld returned 1 exit status

Is this a gcc bug or is there something that I need to do in the build to get the tests to build without error?

Thanks,

Dave

[1]: https://github.com/mozilla/rr
[2]: https://github.com/mozilla/rr/blob/9a532fd786f6378d6b8c2cd70a04731341cf0609/src/test/fxregs.c

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