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C2x adds macros for NaNs and infinities to <float.h>, some of them previously in <math.h> (and some still in <math.h> as well in C2x as an obsolescent feature). Add these macros to GCC's <float.h> implementation. This omits the macros for DFP signaling NaNs, leaving those to be added in a separate patch. However, it includes the _FloatN / _FloatNx macros (conditional on __STDC_WANT_IEC_60559_TYPES_EXT__) in the current draft version of the integration of TS 18661-3 into C2x as an Annex. As GCC allows duplicate macro definitions with different expansions in system headers, it should be OK if <math.h> defines INFINITY or NAN with a slightly different expansion (e.g. different choice of whether there is whitespace between tokens); tests are added including <float.h> and <math.h> in either order. Because <float.h> uses #undef on all macros before defining them, even with -Wsystem-headers there could only ever be issues when <math.h> is included after <float.h>. Bootstrapped with no regressions on x86_64-pc-linux-gnu. gcc/ 2020-11-17 Joseph Myers <joseph@codesourcery.com> * ginclude/float.h (INFINITY, NAN, FLT_SNAN, DBL_SNAN, LDBL_SNAN) (FLT16_SNAN, FLT32_SNAN, FLT64_SNAN, FLT128_SNAN, FLT32X_SNAN) (FLT64X_SNAN, FLT128X_SNAN, DEC_INFINITY, DEC_NAN): New C2x macros. * doc/sourcebuild.texi (Effective-Target Keywords): Document inff. gcc/testsuite/ 2020-11-17 Joseph Myers <joseph@codesourcery.com> * lib/target-supports.exp (check_effective_target_inff): New. * gcc.dg/c11-float-4.c, gcc.dg/c11-float-5.c, gcc.dg/c11-float-dfp-2.c, gcc.dg/c2x-float-2.c, gcc.dg/c2x-float-3.c, gcc.dg/c2x-float-4.c, gcc.dg/c2x-float-5.c, gcc.dg/c2x-float-6.c, gcc.dg/c2x-float-7.c, gcc.dg/c2x-float-8.c, gcc.dg/c2x-float-9.c, gcc.dg/c2x-float-no-dfp-3.c, gcc.dg/c2x-float-no-dfp-4.c, gcc.dg/dfp/c2x-float-dfp-4.c, gcc.dg/dfp/c2x-float-dfp-5.c, gcc.dg/dfp/c2x-float-dfp-6.c, gcc.dg/torture/float128-nan-floath.c, gcc.dg/torture/float128x-nan-floath.c, gcc.dg/torture/float16-nan-floath.c, gcc.dg/torture/float32-nan-floath.c, gcc.dg/torture/float32x-nan-floath.c, gcc.dg/torture/float64-nan-floath.c, gcc.dg/torture/float64x-nan-floath.c, gcc.dg/torture/floatn-nan-floath.h: New tests.
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