AC_CXX_HAVE_SYSTEM_V_MATH
, 
, 

2004-09-27

Todd Veldhuizen Luc Maisonobe <luc@spaceroots.org>

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Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. Users of this software should generally follow the principles of the MIT License includings its disclaimer.

cryp.to ac-archive's C++ Support (released)

If the compiler has the double math functions _class, trunc, itrunc, nearest, rsqrt, uitrunc, copysign, drem, finite, and unordered, define HAVE_SYSTEM_V_MATH.

AC_DEFUN([AC_CXX_HAVE_SYSTEM_V_MATH],
[AC_CACHE_CHECK(whether the compiler supports System V math library,
ac_cv_cxx_have_system_v_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;
_class(x); trunc(x); finite(x); itrunc(x); nearest(x); rsqrt(x); uitrunc(x);
copysign(x,y); drem(x,y); unordered(x,y);
return 0;],
 ac_cv_cxx_have_system_v_math=yes, ac_cv_cxx_have_system_v_math=no)
 LIBS="$ac_save_LIBS"
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_system_v_math" = yes; then
  AC_DEFINE(HAVE_SYSTEM_V_MATH,,[define if the compiler supports System V math library])
fi
])