1 # We check two things: where the include file is for 2 # unordered_map/hash_map (we prefer the first form), and what 3 # namespace unordered/hash_map lives in within that include file. We 4 # include AC_TRY_COMPILE for all the combinations we've seen in the 5 # wild. We define HASH_MAP_H to the location of the header file, and 6 # HASH_NAMESPACE to the namespace the class (unordered_map or 7 # hash_map) is in. We define HAVE_UNORDERED_MAP if the class we found 8 # is named unordered_map, or leave it undefined if not. 9 10 # This also checks if unordered map exists. 11 AC_DEFUN([AC_CXX_STL_HASH], 12 [ 13 AC_MSG_CHECKING(the location of hash_map) 14 AC_LANG_SAVE 15 AC_LANG_CPLUSPLUS 16 ac_cv_cxx_hash_map="" 17 # First try unordered_map, but not on gcc's before 4.2 -- I've 18 # seen unexplainable unordered_map bugs with -O2 on older gcc's. 19 AC_TRY_COMPILE([#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2)) 20 # error GCC too old for unordered_map 21 #endif 22 ], 23 [/* no program body necessary */], 24 [stl_hash_old_gcc=no], 25 [stl_hash_old_gcc=yes]) 26 for location in unordered_map tr1/unordered_map; do 27 for namespace in std std::tr1; do 28 if test -z "$ac_cv_cxx_hash_map" -a "$stl_hash_old_gcc" != yes; then 29 # Some older gcc's have a buggy tr1, so test a bit of code. 30 AC_TRY_COMPILE([#include <$location>], 31 [const ${namespace}::unordered_map<int, int> t; 32 return t.find(5) == t.end();], 33 [ac_cv_cxx_hash_map="<$location>"; 34 ac_cv_cxx_hash_namespace="$namespace"; 35 ac_cv_cxx_hash_map_class="unordered_map";]) 36 fi 37 done 38 done 39 # Now try hash_map 40 for location in ext/hash_map hash_map; do 41 for namespace in __gnu_cxx "" std stdext; do 42 if test -z "$ac_cv_cxx_hash_map"; then 43 AC_TRY_COMPILE([#include <$location>], 44 [${namespace}::hash_map<int, int> t], 45 [ac_cv_cxx_hash_map="<$location>"; 46 ac_cv_cxx_hash_namespace="$namespace"; 47 ac_cv_cxx_hash_map_class="hash_map";]) 48 fi 49 done 50 done 51 ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`; 52 ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`; 53 if test -n "$ac_cv_cxx_hash_map"; then 54 AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map]) 55 AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set]) 56 AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map, 57 [the location of <unordered_map> or <hash_map>]) 58 AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set, 59 [the location of <unordered_set> or <hash_set>]) 60 AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace, 61 [the namespace of hash_map/hash_set]) 62 AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class, 63 [the name of <hash_map>]) 64 AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class, 65 [the name of <hash_set>]) 66 AC_MSG_RESULT([$ac_cv_cxx_hash_map]) 67 else 68 AC_MSG_RESULT() 69 AC_MSG_WARN([could not find an STL hash_map]) 70 fi 71 ]) 72 73
