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])
8 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ext/hash_set>
11 #endif]], [[hash_set<int> t; ]])],[ac_cv_cxx_have_std_ext_hash_set=yes],[ac_cv_cxx_have_std_ext_hash_set=no])
13 if test "$ac_cv_cxx_have_std_ext_hash_set" = yes
15 AC_DEFINE(HAVE_STD_EXT_HASH_SET,1,[Have hash_set in std namespace])
17 AC_DEFINE(HAVE_STD_EXT_HASH_SET,0,[Does not have hash_set in std namespace])
21 AC_DEFUN([AC_CXX_HAVE_GNU_EXT_HASH_SET],
23 [whether the compiler has <ext/hash_set> defining template class __gnu_cxx::hash_set],
24 ac_cv_cxx_have_gnu_ext_hash_set,
25 [AC_REQUIRE([AC_CXX_NAMESPACES])
27 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <ext/hash_set>
28 #ifdef HAVE_NAMESPACES
29 using namespace __gnu_cxx;
30 #endif]], [[hash_set<int> t; ]])],[ac_cv_cxx_have_gnu_ext_hash_set=yes],[ac_cv_cxx_have_gnu_ext_hash_set=no])
32 if test "$ac_cv_cxx_have_gnu_ext_hash_set" = yes
34 AC_DEFINE(HAVE_GNU_EXT_HASH_SET,1,[Have hash_set in gnu namespace])
36 AC_DEFINE(HAVE_GNU_EXT_HASH_SET,0,[Does not have hash_set in gnu namespace])
40 AC_DEFUN([AC_CXX_HAVE_GLOBAL_HASH_SET],
41 [AC_CACHE_CHECK([whether the compiler has <hash_set> defining template class ::hash_set],
42 ac_cv_cxx_have_global_hash_set,
43 [AC_REQUIRE([AC_CXX_NAMESPACES])
45 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])
47 if test "$ac_cv_cxx_have_global_hash_set" = yes
49 AC_DEFINE(HAVE_GLOBAL_HASH_SET,1,[Have hash_set in global namespace])
51 AC_DEFINE(HAVE_GLOBAL_HASH_SET,0,[Does not have hash_set in global namespace])
55 AC_DEFUN([AC_CXX_HAVE_HASH_SET],
56 [AC_CXX_HAVE_STD_EXT_HASH_SET
57 AC_CXX_HAVE_GNU_EXT_HASH_SET
58 AC_CXX_HAVE_GLOBAL_HASH_SET])