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m4/cxx_cmath.m4

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# We check two things: where the include file is for cmath. We

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# include AC_TRY_COMPILE for all the combinations we've seen in the

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# wild.  We define one of HAVE_CMATH or HAVE_TR1_CMATH or 

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# HAVE_BOOST_CMATH depending

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# on location.

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m4_define([_AH_NEED_FUNCS],

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[AC_FOREACH([AC_Func], [$1],

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  [AH_TEMPLATE(AS_TR_CPP([NEED_]AC_Func),

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    [Define to 1 if you need to build a local version of `]AC_Func[' function.])])])

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AC_DEFUN([AC_CXX_CMATH],

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  [AC_MSG_CHECKING(the location of cmath)

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   AC_LANG_PUSH(C++)

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   ac_cv_cxx_cmath=""

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   ac_cv_cxx_cmath_namespace=""

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   for location in tr1/cmath boost/cmath cmath; do

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     for namespace in __gnu_cxx "" std stdext std::tr1; do

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       if test -z "$ac_cv_cxx_cmath"; then

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         AC_TRY_COMPILE([#include <$location>],

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                        [$namespace::isfinite(1)],

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                        [ac_cv_cxx_cmath="<$location>";

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                         ac_cv_cxx_cmath_namespace="$namespace";])

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       fi

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    done

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   done

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   if test -n "$ac_cv_cxx_cmath"; then

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      AC_MSG_RESULT([$ac_cv_cxx_cmath])

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   else

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      ac_cv_cxx_cmath="<math.h>"

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      ac_cv_cxx_cmath_namespace=""

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      AC_MSG_RESULT()

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      AC_MSG_WARN([Could not find a cmath header.])

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      _AH_NEED_FUNCS([isinf isnan isfinite])

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      for ac_func in isinf isnan isfinite ; do

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        AC_TRY_COMPILE([#include <math.h>],

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                       [double x=1.0; $ac_func(x)],

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                       [],[AC_DEFINE_UNQUOTED(AS_TR_CPP([NEED_$ac_func]))])

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      done

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   fi

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   AC_DEFINE_UNQUOTED(CMATH_H,$ac_cv_cxx_cmath,

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                      [the location of <cmath>])

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   if test "x$ac_cv_cxx_cmath_namespace" != "x"

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   then

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     AC_DEFINE_UNQUOTED(CMATH_NAMESPACE,$ac_cv_cxx_cmath_namespace,

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                        [the namespace of C99 math extensions])

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   fi

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   AC_LANG_POP()

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])

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