| # We check two things: where the include file is for hash_map, and |
| # what namespace hash_map lives in within that include file. We |
| # include AC_TRY_COMPILE for all the combinations we've seen in the |
| # wild. We define one of HAVE_HASH_MAP or HAVE_EXT_HASH_MAP depending |
| # on location, and HASH_NAMESPACE to be the namespace hash_map is |
| # defined in. |
| # |
| # Ideally we'd use AC_CACHE_CHECK, but that only lets us store one value |
| # at a time, and we need to store two (filename and namespace). |
| # prints messages itself, so we have to do the message-printing ourselves |
| # via AC_MSG_CHECKING + AC_MSG_RESULT. (TODO(csilvers): can we cache?) |
| |
| AC_DEFUN([AC_CXX_STL_HASH], |
| [AC_REQUIRE([AC_CXX_NAMESPACES]) |
| AC_MSG_CHECKING(the location of hash_map) |
| AC_LANG_SAVE |
| AC_LANG_CPLUSPLUS |
| ac_cv_cxx_hash_map="" |
| for location in ext/hash_map hash_map; do |
| for namespace in __gnu_cxx "" std stdext; do |
| if test -z "$ac_cv_cxx_hash_map"; then |
| AC_TRY_COMPILE([#include <$location>], |
| [${namespace}::hash_map<int, int> t], |
| [ac_cv_cxx_hash_map="<$location>"; |
| ac_cv_cxx_hash_namespace="$namespace";]) |
| fi |
| done |
| done |
| ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`; |
| if test -n "$ac_cv_cxx_hash_map"; then |
| AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map]) |
| AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set]) |
| AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map, |
| [the location of <hash_map>]) |
| AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set, |
| [the location of <hash_set>]) |
| AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace, |
| [the namespace of hash_map/hash_set]) |
| AC_MSG_RESULT([$ac_cv_cxx_hash_map]) |
| else |
| AC_MSG_RESULT() |
| AC_MSG_WARN([could not find an STL hash_map]) |
| fi |
| ]) |