1 # We check two things: where the include file is for hash_map, and 2 # what namespace hash_map lives in within that include file. We 3 # include AC_TRY_COMPILE for all the combinations we've seen in the 4 # wild. We define one of HAVE_HASH_MAP or HAVE_EXT_HASH_MAP depending 5 # on location, and HASH_NAMESPACE to be the namespace hash_map is 6 # defined in. 7 # 8 # Ideally we'd use AC_CACHE_CHECK, but that only lets us store one value 9 # at a time, and we need to store two (filename and namespace). 10 # prints messages itself, so we have to do the message-printing ourselves 11 # via AC_MSG_CHECKING + AC_MSG_RESULT. (TODO(csilvers): can we cache?) 12 13 AC_DEFUN([AC_CXX_STL_HASH], 14 [AC_MSG_CHECKING(the location of hash_map) 15 AC_LANG_SAVE 16 AC_LANG_CPLUSPLUS 17 ac_cv_cxx_hash_map_header="" 18 ac_cv_cxx_hash_map_class="" 19 for location in [tr1/unordered_map ext/hash_map hash_map]; do 20 for namespace in [std::tr1 __gnu_cxx "" std stdext]; do 21 for name in [unordered_map hash_map]; do 22 23 if test -z "$ac_cv_cxx_hash_map_header"; then 24 25 # On OSX 1.5 / GCC 4.0.1 (the standard compiler on that platform), 26 # calling find() on a const unordered_map does not compile. So, we 27 # include a call to find() in our test to detect this broken 28 # implementation and avoid using it. Note that ext/hash_map works 29 # fine on this platform, so we'll end up using that. 30 AC_TRY_COMPILE([#include <$location>], 31 [const ${namespace}::$name<int, int> t; 32 t.find(1);], 33 [ac_cv_cxx_hash_map_header="<$location>"; 34 ac_cv_cxx_hash_namespace="$namespace"; 35 ac_cv_cxx_hash_map_class="$name";]) 36 fi 37 done 38 done 39 done 40 ac_cv_cxx_hash_set_header=`echo "$ac_cv_cxx_hash_map_header" | sed s/map/set/`; 41 ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`; 42 if test -n "$ac_cv_cxx_hash_map_header"; then 43 AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map]) 44 AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set]) 45 AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map_header, 46 [the location of <hash_map>]) 47 AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set_header, 48 [the location of <hash_set>]) 49 AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class, 50 [the name of <hash_set>]) 51 AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class, 52 [the name of <hash_set>]) 53 AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace, 54 [the namespace of hash_map/hash_set]) 55 AC_MSG_RESULT([$ac_cv_cxx_hash_map_header]) 56 else 57 AC_MSG_RESULT() 58 AC_MSG_WARN([could not find an STL hash_map]) 59 fi 60 ]) 61
