ac_cxx_have_ieee_math.m4

c++经典教材 Blitz++ v0.8

dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ieee_math.html
dnl
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
])