I'm trying to use the target_clones attribute on C functions in a library (BLIS linear algebra, for what it's worth) and failing. This is with gcc-6 on Debian stable, i.e. with recent enough binutils, if that makes a difference. The functions are in their own source files (actually a set of numeric type variants of each). It seems experimentally as if the functions have to be obviously used somehow, possibly in the same file, to get a resolver function for some reason. I can get a resolver in the object with a dummy call in the source file. However, when I build a shared library with the result, the resolver and clones disappear from the result. I've also tried LTO to no avail, hoping that might help, as the kernels are called from elsewhere in the library. This seems a canonical sort of use for clones, but I can't find any guidance on making it work. Can someone reveal a relevant trick, or explain what's going wrong? Thanks.
