Macro: ac_cxx_have_system_v_math

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# ac_cxx_have_system_v_math

## Synopsis

`AC_CXX_HAVE_SYSTEM_V_MATH`

## Version

1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.32

## Author

Luc Maisonobe

## Description

If the compiler has the double math functions _class, ilogb, itrunc, nearest, rsqrt, uitrunc, copysign, drem, fmod, hypot, nextafter, remainder, scalb and unordered, define HAVE_SYSTEM_V_MATH.

## M4 Source Code

    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); ilogb(x); itrunc(x); nearest(x); rsqrt(x); uitrunc(x);
    copysign(x,y); drem(x,y); fmod(x,y); hypot(x,y); nextafter(x,y);
    remainder(x,y); scalb(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
    ])