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.
10 # This also checks if unordered map exists.
11 AC_DEFUN([AC_CXX_STL_HASH],
13 AC_MSG_CHECKING(the location of 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
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="$namespace";
35 ac_cv_cxx_hash_map_class="unordered_map";])
40 for location in ext/hash_map hash_map; do
41 for namespace in __gnu_cxx "" std stdext; do
42 if test -z "$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";])
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])
69 AC_MSG_WARN([could not find an STL hash_map])