autoconf/m4/cxx_hash_set.m4

   1 # Check for hash_set extension.  This is modified from
   2 # http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_set.html
   3 AC_DEFUN([AC_CXX_HAVE_STD_EXT_HASH_SET],
   4 [AC_CACHE_CHECK([whether the compiler has <ext/hash_set> defining template class std::hash_set],
   5  ac_cv_cxx_have_std_ext_hash_set,
   6  [AC_REQUIRE([AC_CXX_NAMESPACES])
   7   AC_LANG_PUSH([C++])
   8   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ext/hash_set>
   9 #ifdef HAVE_NAMESPACES
  10 using namespace std;
  11 #endif]], [[hash_set<int> t; ]])],[ac_cv_cxx_have_std_ext_hash_set=yes],[ac_cv_cxx_have_std_ext_hash_set=no])
  12   AC_LANG_POP([C++])])
  13  HAVE_STD_EXT_HASH_SET=0
  14  if test "$ac_cv_cxx_have_std_ext_hash_set" = yes
  15  then
  16    HAVE_STD_EXT_HASH_SET=1
  17  fi
  18  AC_SUBST(HAVE_STD_EXT_HASH_SET)])
  19
  20 AC_DEFUN([AC_CXX_HAVE_GNU_EXT_HASH_SET],
  21 [AC_CACHE_CHECK(
  22  [whether the compiler has <ext/hash_set> defining template class __gnu_cxx::hash_set],
  23  ac_cv_cxx_have_gnu_ext_hash_set,
  24  [AC_REQUIRE([AC_CXX_NAMESPACES])
  25   AC_LANG_PUSH([C++])
  26   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ext/hash_set>
  27 #ifdef HAVE_NAMESPACES
  28 using namespace __gnu_cxx;
  29 #endif]], [[hash_set<int> t; ]])],[ac_cv_cxx_have_gnu_ext_hash_set=yes],[ac_cv_cxx_have_gnu_ext_hash_set=no])
  30   AC_LANG_POP([C++])])
  31  HAVE_GNU_EXT_HASH_SET=0
  32  if test "$ac_cv_cxx_have_gnu_ext_hash_set" = yes
  33  then
  34    HAVE_GNU_EXT_HASH_SET=1
  35  fi
  36  AC_SUBST(HAVE_GNU_EXT_HASH_SET)])
  37
  38 AC_DEFUN([AC_CXX_HAVE_GLOBAL_HASH_SET],
  39 [AC_CACHE_CHECK([whether the compiler has <hash_set> defining template class ::hash_set],
  40  ac_cv_cxx_have_global_hash_set,
  41  [AC_REQUIRE([AC_CXX_NAMESPACES])
  42   AC_LANG_PUSH([C++])
  43   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <hash_set>]], [[hash_set<int> t; return 0;]])],[ac_cv_cxx_have_global_hash_set=yes],[ac_cv_cxx_have_global_hash_set=no])
  44   AC_LANG_POP([C++])])
  45  HAVE_GLOBAL_HASH_SET=0
  46  if test "$ac_cv_cxx_have_global_hash_set" = yes
  47  then
  48    HAVE_GLOBAL_HASH_SET=1
  49  fi
  50  AC_SUBST(HAVE_GLOBAL_HASH_SET)])
  51
  52 AC_DEFUN([AC_CXX_HAVE_HASH_SET],
  53 [AC_CXX_HAVE_STD_EXT_HASH_SET
  54  AC_CXX_HAVE_GNU_EXT_HASH_SET
  55  AC_CXX_HAVE_GLOBAL_HASH_SET])
  56
  57