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  • Committer: Brian Aker
  • Date: 2008-11-03 21:00:47 UTC
  • mfrom: (520.9.5 devel)
  • Revision ID: brian@tangent.org-20081103210047-wfkeyyefrfl2vh4l
Merge from Monty

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m4/cxx_cmath.m4
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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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[m4_foreach_w([AC_Func], [$1],
 
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  [AH_TEMPLATE(AS_TR_CPP([NEED_]m4_defn([AC_Func])),
 
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    [Define to 1 if you need to build a local version of `]m4_defn([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_SAVE
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   AC_LANG_CPLUSPLUS
 
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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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      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,$ac_cv_cxx_cmath,
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                      [the location of <cmath>])
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     AC_DEFINE_UNQUOTED(CMATH_NAMESPACE,$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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])