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Older versions of OS X (at least Leopard) are missing some declarations of C99 functions from <math.h>, which causes our configure test to decide that all C99 functions are missing from <math.h>. Rather then splitting up the check into dozens of smaller checks for individual functions (which would be stage 1 material) this just adds a special case for the six missing functions, so that darwin checks for them separately and defaines a new macro to say they're missing. PR libstdc++/79017 * acinclude.m4 (GLIBCXX_CHECK_C99_TR1): Check for llrint and llround functions separately on darwin and if they're missing define _GLIBCXX_NO_C99_ROUNDING_FUNCS. * config.h.in: Regenerate. * configure: Regenerate. * include/c_global/cmath [_GLIBCXX_NO_C99_ROUNDING_FUNCS] (llrint) (llrintf, llrintl, llround, llroundf, llroundl): Do not define. Tested x86_64-linux, committed to trunk.
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