https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79341
--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Another option is executable testcase trying to dlsym __tls_get_addr_internal (but that is not cross-compilation friendly), or perhaps nm or readelf on the dynamic linker (but that is not really that easy for cross-compilation either, one has to find it in a sysroot etc.). Perhaps the glibc version check and if that check fails and not cross-compiling, try the dlsym way?
