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Viewing changes to m4/cxx_cmath.m4

  • Committer: Monty
  • Date: 2008-10-02 14:34:07 UTC
  • Revision ID: mordred@scylla.inaugust.com-20081002143407-id6de0nl3trrna4j
Fixed some max/min misses.

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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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AC_DEFUN([AC_CXX_CMATH],
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  [AC_MSG_CHECKING(the location of cmath)
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  AC_LANG_SAVE
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   AC_LANG_CPLUSPLUS
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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([$ac_cv_cxx_cmath])
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   else
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      ac_cv_cxx_cmath="<math.h>"
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      ac_cv_cxx_cmath_namespace=""
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      AC_MSG_RESULT()
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      AC_MSG_WARN([Could not find a cmath header.])
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   fi
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   AC_DEFINE_UNQUOTED(CMATH_H,$ac_cv_cxx_cmath,
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                      [the location of <cmath>])
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   AC_DEFINE_UNQUOTED(CMATH_NAMESPACE,$ac_cv_cxx_cmath_namespace,
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                      [the namespace of C99 math extensions])
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])