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ac_cxx_have_ieee_math

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Synopsis

AC_CXX_HAVE_IEEE_MATH

Version

1.1.1.1 (2001/07/26)     0.5.55   :   C++_Support

Author

Luc Maisonobe

Description

If the compiler has the double math functions acosh, asinh, atanh, expm1, erf, erfc, isnan, j0, j1, lgamma, logb, log1p, rint, y0 and y1, define HAVE_IEEE_MATH.

M4 Source Code
AC_DEFUN([AC_CXX_HAVE_IEEE_MATH],
[AC_CACHE_CHECK(whether the compiler supports IEEE math library,
ac_cv_cxx_have_ieee_math,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 ac_save_LIBS="$LIBS"
 LIBS="$LIBS -lm"
 AC_TRY_LINK([
#ifndef _ALL_SOURCE
 #define _ALL_SOURCE
#endif
#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE
#endif
#ifndef _XOPEN_SOURCE_EXTENDED
 #define _XOPEN_SOURCE_EXTENDED 1
#endif
#include <math.h>],[double x = 1.0; double y = 1.0;
acosh(x); asinh(x); atanh(x); expm1(x); erf(x); erfc(x); isnan(x);
j0(x); j1(x); lgamma(x); logb(x); log1p(x); rint(x); y0(x); y1(x);
return 0;],
 ac_cv_cxx_have_ieee_math=yes, ac_cv_cxx_have_ieee_math=no)
 LIBS="$ac_save_LIBS"
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_ieee_math" = yes; then
  AC_DEFINE(HAVE_IEEE_MATH,,[define if the compiler supports IEEE math library])
fi
])