Re: Problem with <math.h> and -D_GNU_SOURCE and GCC 2.95.1

[George Talbot <george@moberg.com>]

On 24 Aug 1999, Andreas Jaeger wrote:

> >>>>> George T Talbot writes:
> 
>  > If I compile a C program with -D_GNU_SOURCE, and I include <math.h>,
>  > which I'm doing so I can get to some extra features, such as the NAN
>  > #define, I get the following compilation error:
> 
> Should be fixed in glibc 2.2.  The current code is:

So, download 2.2, and I should be OK, right?

--
George T. Talbot
<george@moberg.com>


> /* The gcc, version 2.7 or below, has problems with all this inlining
>    code.  So disable it for this version of the compiler.  */
> # if (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 7))
> /* Test for negative number.  Used in the signbit() macro.  */
> __MATH_INLINE int
> __signbitf (float __x)
> {
>   __extension__ union { float __f; int __i; } __u = { __f: __x };
>   return __u.__i < 0;
> }
> __MATH_INLINE int
> __signbit (double __x)
> {
>   __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
>   return __u.__i[1] < 0;
> }
> __MATH_INLINE int
> __signbitl (long double __x)
> {
>   __extension__ union { long double __l; int __i[3]; } __u = { __l: __x };
>   return (__u.__i[2] & 0x8000) != 0;
> }
> # endif
> #endif
> 
> Andreas
> -- 
>  Andreas Jaeger   aj@arthur.rhein-neckar.de    jaeger@informatik.uni-kl.de
>   for pgp-key finger ajaeger@aixd1.rhrk.uni-kl.de
>