autoconf/m4/cxx_hash_map.m4

   1 # Check for hash_map extension.  This is from
   2 # http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_map.html
   3 AC_DEFUN([AC_CXX_HAVE_STD_EXT_HASH_MAP],
   4 [AC_CACHE_CHECK([whether the compiler has <ext/hash_map> defining template class std::hash_map],
   5  ac_cv_cxx_have_std_ext_hash_map,
   6  [AC_REQUIRE([AC_CXX_NAMESPACES])
   7   AC_LANG_SAVE
   8   AC_LANG_CPLUSPLUS
   9   AC_TRY_COMPILE([#include <ext/hash_map>
  10 #ifdef HAVE_NAMESPACES
  11 using namespace std;
  12 #endif],[hash_map<int, int> t;],
  13   [ac_cv_cxx_have_std_ext_hash_map=yes], [ac_cv_cxx_have_std_ext_hash_map=no])
  14   AC_LANG_RESTORE])
  15  HAVE_STD_EXT_HASH_MAP=0
  16  if test "$ac_cv_cxx_have_std_ext_hash_map" = yes
  17  then
  18    HAVE_STD_EXT_HASH_MAP=1
  19  fi
  20  AC_SUBST(HAVE_STD_EXT_HASH_MAP)])
  21
  22 AC_DEFUN([AC_CXX_HAVE_GNU_EXT_HASH_MAP],
  23 [AC_CACHE_CHECK([whether the compiler has <ext/hash_map> defining template class __gnu_cxx::hash_map],
  24  ac_cv_cxx_have_gnu_ext_hash_map,
  25  [AC_REQUIRE([AC_CXX_NAMESPACES])
  26   AC_LANG_SAVE
  27   AC_LANG_CPLUSPLUS
  28   AC_TRY_COMPILE([#include <ext/hash_map>
  29 #ifdef HAVE_NAMESPACES
  30 using namespace __gnu_cxx;
  31 #endif],[hash_map<int,int> t; ],
  32   [ac_cv_cxx_have_gnu_ext_hash_map=yes],[ac_cv_cxx_have_gnu_ext_hash_map=no])
  33   AC_LANG_RESTORE])
  34  HAVE_GNU_EXT_HASH_MAP=0
  35  if test "$ac_cv_cxx_have_gnu_ext_hash_map" = yes
  36  then
  37    HAVE_GNU_EXT_HASH_MAP=1
  38  fi
  39  AC_SUBST(HAVE_GNU_EXT_HASH_MAP)])
  40
  41 AC_DEFUN([AC_CXX_HAVE_GLOBAL_HASH_MAP],
  42 [AC_CACHE_CHECK([whether the compiler has <hash_map> defining template class ::hash_map],
  43  ac_cv_cxx_have_global_hash_map,
  44  [AC_REQUIRE([AC_CXX_NAMESPACES])
  45   AC_LANG_SAVE
  46   AC_LANG_CPLUSPLUS
  47   AC_TRY_COMPILE([#include <hash_map>],[hash_map<int,int> t; ],
  48   [ac_cv_cxx_have_global_hash_map=yes], [ac_cv_cxx_have_global_hash_map=no])
  49   AC_LANG_RESTORE])
  50  HAVE_GLOBAL_HASH_MAP=0
  51  if test "$ac_cv_cxx_have_global_hash_map" = yes
  52  then
  53    HAVE_GLOBAL_HASH_MAP=1
  54  fi
  55  AC_SUBST(HAVE_GLOBAL_HASH_MAP)])
  56
  57 AC_DEFUN([AC_CXX_HAVE_HASH_MAP],
  58 [AC_CXX_HAVE_STD_EXT_HASH_MAP
  59  AC_CXX_HAVE_GNU_EXT_HASH_MAP
  60  AC_CXX_HAVE_GLOBAL_HASH_MAP])
  61
  62