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
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?)
13
AC_DEFUN([AC_CXX_STL_HASH],
14
[AC_MSG_CHECKING(the location of hash_map)
18
for location in ext/hash_map boost/hash_map hash_map; do
19
for namespace in __gnu_cxx "" std stdext; do
20
if test -z "$ac_cv_cxx_hash_map"; then
21
AC_TRY_COMPILE([#include <$location>],
22
[${namespace}::hash_map<int, int> t],
23
[ac_cv_cxx_hash_map="<$location>";
24
ac_cv_cxx_hash_namespace="$namespace";])
28
ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
29
if test -n "$ac_cv_cxx_hash_map"; then
30
AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
31
AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
32
AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
33
[the location of <hash_map>])
34
AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
35
[the location of <hash_set>])
36
AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
37
[the namespace of hash_map/hash_set])
38
AC_MSG_RESULT([$ac_cv_cxx_hash_map])
41
AC_MSG_WARN([could not find an STL hash_map])
added
removed
m4/stl_hash.m4
