#39 isinf and isnan causing build failure on solaris

[Richard Uhler]

Build fails on solaris because isnan and isinf aren't found. I ran into this problem before and fixed it in the makefile by adding -D__C99FEATURES__. The switch to autoconf got rid of that fix.

We can solve the problem the same way as a decent temporary solution. In the long run, it has been suggested to me a good solution would be to add isnan and isinf to gnulib and use that.

[Richard Uhler]

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Adding -D__C99FEATURES__ didn't fix the problem, so I guess it's not a decent temporary solution.

[Richard Uhler]

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Adding the following, taken from the autoconf manual, fixed the isnan and isinf problems:

#ifndef isnan

# define isnan(x) \

(sizeof (x) == sizeof (long double) ? isnan_ld (x) \

sizeof (x) == sizeof (double) ? isnan_d (x) \

isnan_f (x))
static inline int isnan_f (float x) { return x != x; }
static inline int isnan_d (double x) { return x != x; }
static inline int isnan_ld (long double x) { return x != x; }
#endif

#ifndef isinf

# define isinf(x) \

(sizeof (x) == sizeof (long double) ? isinf_ld (x) \

sizeof (x) == sizeof (double) ? isinf_d (x) \

isinf_f (x))
static inline int isinf_f (float x) { return isnan (x - x); }
static inline int isinf_d (double x) { return isnan (x - x); }
static inline int isinf_ld (long double x) { return isnan (x - x); }
#endif

Though admittedly, I didn't manage to run them and see if they worked.

The ideal solution would be add this to gnulib, and then use that.