On 2013-07-11 21:36, David Chisnall wrote: > On 11 Jul 2013, at 19:52, Tijl Coosemans <t...@coosemans.org> wrote: >>> @@ -227,8 +250,6 @@ double expm1(double); >>> double fma(double, double, double); >>> double hypot(double, double); >>> int ilogb(double) __pure2; >>> -int (isinf)(double) __pure2; >>> -int (isnan)(double) __pure2; >> >> I think they should stay for the C90 case. > > That would completely defeat the point of this entire exercise and be > redundant unless we aim to support a compiler that only supports C90 > and no GNU extensions, in which case you'll hit errors in cdefs.h, > long before you get to this point in an include.
isnan(double) is part of SUSv2. It should be visible when compiling with -D_XOPEN_SOURCE=500. I think you need something like this: #if (__BSD_VISIBLE || __XSI_VISIBLE <= 500) && __ISO_C_VISIBLE < 1999 int isinf(double) __pure2; int isnan(double) __pure2; #endif
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