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Autoconf Macro: ac_cxx_have_ieee_math
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<h1>
ac_cxx_have_ieee_math
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_CXX_HAVE_IEEE_MATH</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
If the compiler has the double math functions acosh, asinh, atanh, cbrt,
expm1, erf, erfc, isnan, j0, j1, jn, gamma, lgamma, ilogb, logb, log1p,
rint, y0, y1, yn, hypot, nextafter, remainder and scalb, define
HAVE_IEEE_MATH.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Todd Veldhuizen, Luc Maisonobe <luc@spaceroots.org>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2004-09-27
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
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; int i = 1;
acosh(x); asinh(x); atanh(x); cbrt(x); expm1(x); erf(x); erfc(x); isnan(x);
j0(x); j1(x); jn(i,x); ilogb(x); logb(x); log1p(x); rint(x);
y0(x); y1(x); yn(i,x);
#ifdef _THREAD_SAFE
gamma_r(x,&i);
lgamma_r(x,&i);
#else
gamma(x);
lgamma(x);
#endif
hypot(x,y); nextafter(x,y); remainder(x,y); scalb(x,y);
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
])
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