https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71993
Bug ID: 71993 Summary: __builtin_cpu_supports() does not support "f16c" Product: gcc Version: 7.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: sgunderson at bigfoot dot com Target Milestone: --- As the summary says. You just get: lib.cc:4:1: error: Parameter to builtin not valid: f16c Tested with: gcc version 7.0.0 20160707 (experimental) [trunk revision 238117] (Debian 20160707-1)