https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79305
--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> --- On Tue, Jan 31, 2017 at 06:00:43PM +0000, kargl at gcc dot gnu.org wrote: > > The above will clearly never be built. In fact, a causal perusal > of c99_protos.h shows that none of the fallback functions in > c99_functions.c are built. > Ugh. I retract this part of the analysis. c99_protos.h is not used within c99_functions.c. The issue is an incorrect spelling of HAVE_EXPL as EXPL.