dnl for testing a numberical version number comes handy
dnl the released version are
dnl a.bccc
dnl the devl versions will be something like
dnl a.b999yymmddhh
dnl for testing a numberical version number comes handy
dnl the released version are
dnl a.bccc
dnl the devl versions will be something like
dnl a.b999yymmddhh
dnl actual code to check if this works
AC_CHECK_FUNCS(fpclassify, ,
[AC_MSG_CHECKING(for fpclassify with <math.h>)
dnl actual code to check if this works
AC_CHECK_FUNCS(fpclassify, ,
[AC_MSG_CHECKING(for fpclassify with <math.h>)
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; fpclassify(f)]])],[AC_MSG_RESULT(yes)
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>
+volatile int x;volatile float f; ]], [[x = fpclassify(f)]])],[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FPCLASSIFY)],[AC_MSG_RESULT(no)])])
AC_CHECK_FUNCS(finite, ,
[AC_CHECK_FUNCS(isfinite, ,
[AC_MSG_CHECKING(for isfinite with <math.h>)
AC_DEFINE(HAVE_FPCLASSIFY)],[AC_MSG_RESULT(no)])])
AC_CHECK_FUNCS(finite, ,
[AC_CHECK_FUNCS(isfinite, ,
[AC_MSG_CHECKING(for isfinite with <math.h>)
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; isfinite(f)]])],[AC_MSG_RESULT(yes)
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>
+volatile int x;volatile float f; ]], [[x = isfinite(f)]])],[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ISFINITE)],[AC_MSG_RESULT(no)])])])
AC_CHECK_FUNCS(isinf, ,
[AC_MSG_CHECKING(for isinf with <math.h>)
AC_DEFINE(HAVE_ISFINITE)],[AC_MSG_RESULT(no)])])])
AC_CHECK_FUNCS(isinf, ,
[AC_MSG_CHECKING(for isinf with <math.h>)
- AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>]], [[float f = 0.0; isinf(f)]])],[AC_MSG_RESULT(yes)
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <math.h>
+volatile int x;volatile float f; ]], [[x = isinf(f)]])],[AC_MSG_RESULT(yes)