AC_CXX_HAVE_EXT_HASH_SET
, 

2002-09-04

Alain BARBET <alian@cpan.org>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

cryp.to ac-archive's C++ Support (released)

Check if the compiler has ext/hash_set Eg:

 #if defined(HAVE_EXT_HASH_SET)
 #include <ext/hash_set>
 #else
 #if defined(HAVE_STL)
 #include <hash_set>
 #else
 # Can't find hash_set header !
 #endif
 #endif

AC_DEFUN([AC_CXX_HAVE_EXT_HASH_SET],
[AC_CACHE_CHECK(whether the compiler has ext/hash_set,
ac_cv_cxx_have_ext_hash_set,
[AC_REQUIRE([AC_CXX_NAMESPACES])
  AC_LANG_SAVE
  AC_LANG_CPLUSPLUS
  AC_TRY_COMPILE([#include <ext/hash_set>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif],[hash_set<int> t; return 0;],
  ac_cv_cxx_have_ext_hash_set=yes, ac_cv_cxx_have_ext_hash_set=no)
  AC_LANG_RESTORE
])
if test "$ac_cv_cxx_have_ext_hash_set" = yes; then
   AC_DEFINE(HAVE_EXT_HASH_SET,,[define if the compiler has ext/hash_set])
fi
])