The Decimal Floating Point (DFP) Technical Report (TR) added DFP versions of HUGE_VAL to <math.h>. They are missing in (at least) gcc 4.3.2-7.
/* DFP TR 24732 == WG14 / N1176, N1312 */ #define __STDC_WANT_DEC_FP__ /* Tell implementation that we want Decimal FP */ #include <math.h> /* HUGE_VAL_D* */ _Decimal32 d32 = HUGE_VAL_D32; _Decimal64 d64 = HUGE_VAL_D64; _Decimal128 d128 = HUGE_VAL_D128; gets: test1.c:5: warning: ISO C does not support decimal floating point test1.c:5: error: 'HUGE_VAL_D32' undeclared here (not in a function) test1.c:6: warning: ISO C does not support decimal floating point test1.c:6: error: 'HUGE_VAL_D64' undeclared here (not in a function) test1.c:7: warning: ISO C does not support decimal floating point test1.c:7: error: 'HUGE_VAL_D128' undeclared here (not in a function) Janis asked to be CCed on DFP bugs. -- Summary: HUGE_VAL_D32, HUGE_VAL_D64, HUGE_VAL_D128 missing from <math.h> Product: gcc Version: 4.3.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tydeman at tybor dot com GCC host triplet: 4.3.2 GCC target triplet: 4.3.2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39031