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# We check two things: where the include file is for hash_map, and
# what namespace hash_map lives in within that include file. We
# include AC_TRY_COMPILE for all the combinations we've seen in the
# wild. We define one of HAVE_HASH_MAP or HAVE_EXT_HASH_MAP depending
# on location, and HASH_NAMESPACE to be the namespace hash_map is
# defined in.
#
# Ideally we'd use AC_CACHE_CHECK, but that only lets us store one value
# at a time, and we need to store two (filename and namespace).
# prints messages itself, so we have to do the message-printing ourselves
# via AC_MSG_CHECKING + AC_MSG_RESULT. (TODO(csilvers): can we cache?)
AC_DEFUN([AC_CXX_STL_HASH],
[AC_MSG_CHECKING(the location of hash_map)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_cv_cxx_hash_map_header=""
ac_cv_cxx_hash_map_class=""
for location in [tr1/unordered_map ext/hash_map hash_map]; do
for namespace in [std::tr1 __gnu_cxx "" std stdext]; do
for name in [unordered_map hash_map]; do
if test -z "$ac_cv_cxx_hash_map_header"; then
# On OSX 1.5 / GCC 4.0.1 (the standard compiler on that platform),
# calling find() on a const unordered_map does not compile. So, we
# include a call to find() in our test to detect this broken
# implementation and avoid using it. Note that ext/hash_map works
# fine on this platform, so we'll end up using that.
AC_TRY_COMPILE([#include <$location>],
[const ${namespace}::$name<int, int> t;
t.find(1);],
[ac_cv_cxx_hash_map_header="<$location>";
ac_cv_cxx_hash_namespace="$namespace";
ac_cv_cxx_hash_map_class="$name";])
fi
done
done
done
ac_cv_cxx_hash_set_header=`echo "$ac_cv_cxx_hash_map_header" | sed s/map/set/`;
ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`;
if test -n "$ac_cv_cxx_hash_map_header"; then
AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map_header,
[the location of <hash_map>])
AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set_header,
[the location of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class,
[the name of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
[the name of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
[the namespace of hash_map/hash_set])
AC_MSG_RESULT([$ac_cv_cxx_hash_map_header])
else
AC_MSG_RESULT()
AC_MSG_WARN([could not find an STL hash_map])
fi
])
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