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patch 7.4.1437

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Problem:    Old system doesn't have isinf() and NAN. (Ben Fritz)
Solution:   Adjust #ifdefs.  Detect isnan() and isinf() functions with
            configure. Use a replacement when missing. (Kazunobu Kuriyama)
This commit is contained in:
Bram Moolenaar
2016-02-27 20:14:15 +01:00
parent e98991b8cf
commit 136f29a91d
8 changed files with 85 additions and 34 deletions
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29
src/macros.h
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@@ -320,3 +320,32 @@
#if defined(FEAT_CHANNEL) || defined(FEAT_JOB) || defined(FEAT_CLIENTSERVER)
# define MESSAGE_QUEUE
#endif
#if defined(FEAT_EVAL) && defined(FEAT_FLOAT)
# include <float.h>
# if defined(HAVE_MATH_H)
/* for isnan() and isinf() */
# include <math.h>
# endif
# if defined(WIN32) && !defined(isnan)
# define isnan(x) _isnan(x)
# define isinf(x) (!_finite(x) && !_isnan(x))
# else
# ifndef HAVE_ISNAN
static inline int isnan(double x) { return x != x; }
# endif
# ifndef HAVE_ISINF
static inline int isinf(double x) { return !isnan(x) && isnan(x - x); }
# endif
# endif
# if !defined(INFINITY)
# if defined(DBL_MAX)
# define INFINITY (DBL_MAX+DBL_MAX)
# else
# define INFINITY (1.0 / 0.0)
# endif
# endif
# if !defined(NAN)
# define NAN (INFINITY-INFINITY)
# endif
#endif