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