[Bug c/91664] Undefined reference linker errors when static linking archive with gcc target_clones function multi-versioning

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91664

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
             Status|WAITING                     |NEW
                 CC|                            |marxin at gcc dot gnu.org
      Known to fail|                            |10.0, 8.3.1, 9.2.1

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
The issue is that with a declaration like

double fmv_test (double *dArray, int size) __attribute__ ((__target_clones__
("avx2","avx","sse4.1","sse2","default")));

we're creating a resolver even if there's no definition of fmv_test visible.
We shouldn't do that.  We should only emit resolvers for definitions.