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@@ -1,60 +1,72 @@
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-# We check two things: where the include file is for hash_map, and
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-# what namespace hash_map lives in within that include file. We
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+# We check two things: where the include file is for
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+# unordered_map/hash_map (we prefer the first form), and what
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+# namespace unordered/hash_map lives in within that include file. We
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# include AC_TRY_COMPILE for all the combinations we've seen in the
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# include AC_TRY_COMPILE for all the combinations we've seen in the
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-# wild. We define one of HAVE_HASH_MAP or HAVE_EXT_HASH_MAP depending
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-# on location, and HASH_NAMESPACE to be the namespace hash_map is
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-# defined in.
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-#
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-# Ideally we'd use AC_CACHE_CHECK, but that only lets us store one value
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-# at a time, and we need to store two (filename and namespace).
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-# prints messages itself, so we have to do the message-printing ourselves
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-# via AC_MSG_CHECKING + AC_MSG_RESULT. (TODO(csilvers): can we cache?)
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+# wild. We define HASH_MAP_H to the location of the header file, and
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+# HASH_NAMESPACE to the namespace the class (unordered_map or
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+# hash_map) is in. We define HAVE_UNORDERED_MAP if the class we found
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+# is named unordered_map, or leave it undefined if not.
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+# This also checks if unordered map exists.
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AC_DEFUN([AC_CXX_STL_HASH],
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AC_DEFUN([AC_CXX_STL_HASH],
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- [AC_MSG_CHECKING(the location of hash_map)
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- AC_LANG_SAVE
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+ [
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+ AC_MSG_CHECKING(the location of hash_map)
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+ AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_LANG_CPLUSPLUS
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- ac_cv_cxx_hash_map_header=""
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- ac_cv_cxx_hash_map_class=""
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- for location in [tr1/unordered_map ext/hash_map hash_map]; do
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- for namespace in [std::tr1 __gnu_cxx "" std stdext]; do
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- for name in [unordered_map hash_map]; do
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-
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- if test -z "$ac_cv_cxx_hash_map_header"; then
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-
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- # On OSX 1.5 / GCC 4.0.1 (the standard compiler on that platform),
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- # calling find() on a const unordered_map does not compile. So, we
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- # include a call to find() in our test to detect this broken
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- # implementation and avoid using it. Note that ext/hash_map works
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- # fine on this platform, so we'll end up using that.
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- AC_TRY_COMPILE([#include <$location>],
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- [const ${namespace}::$name<int, int> t;
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- t.find(1);],
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- [ac_cv_cxx_hash_map_header="<$location>";
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- ac_cv_cxx_hash_namespace="$namespace";
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- ac_cv_cxx_hash_map_class="$name";])
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- fi
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- done
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+ ac_cv_cxx_hash_map=""
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+ # First try unordered_map, but not on gcc's before 4.2 -- I've
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+ # seen unexplainable unordered_map bugs with -O2 on older gcc's.
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+ AC_TRY_COMPILE([#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2))
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+ # error GCC too old for unordered_map
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+ #endif
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+ ],
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+ [/* no program body necessary */],
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+ [stl_hash_old_gcc=no],
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+ [stl_hash_old_gcc=yes])
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+ for location in unordered_map tr1/unordered_map; do
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+ for namespace in std std::tr1; do
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+ if test -z "$ac_cv_cxx_hash_map" -a "$stl_hash_old_gcc" != yes; then
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+ # Some older gcc's have a buggy tr1, so test a bit of code.
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+ AC_TRY_COMPILE([#include <$location>],
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+ [const ${namespace}::unordered_map<int, int> t;
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+ return t.find(5) == t.end();],
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+ [ac_cv_cxx_hash_map="<$location>";
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+ ac_cv_cxx_hash_namespace="$namespace";
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+ ac_cv_cxx_hash_map_class="unordered_map";])
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+ fi
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done
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done
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done
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done
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- ac_cv_cxx_hash_set_header=`echo "$ac_cv_cxx_hash_map_header" | sed s/map/set/`;
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+ # Now try hash_map
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+ for location in ext/hash_map hash_map; do
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+ for namespace in __gnu_cxx "" std stdext; do
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+ if test -z "$ac_cv_cxx_hash_map"; then
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+ AC_TRY_COMPILE([#include <$location>],
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+ [${namespace}::hash_map<int, int> t],
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+ [ac_cv_cxx_hash_map="<$location>";
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+ ac_cv_cxx_hash_namespace="$namespace";
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+ ac_cv_cxx_hash_map_class="hash_map";])
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+ fi
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+ done
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+ done
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+ ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
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ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`;
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ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`;
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- if test -n "$ac_cv_cxx_hash_map_header"; then
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+ if test -n "$ac_cv_cxx_hash_map"; then
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AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
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AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
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AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
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AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
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- AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map_header,
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- [the location of <hash_map>])
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- AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set_header,
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- [the location of <hash_set>])
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+ AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
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+ [the location of <unordered_map> or <hash_map>])
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+ AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
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+ [the location of <unordered_set> or <hash_set>])
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+ AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
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+ [the namespace of hash_map/hash_set])
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AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class,
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AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class,
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- [the name of <hash_set>])
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+ [the name of <hash_map>])
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AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
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AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
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[the name of <hash_set>])
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[the name of <hash_set>])
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- AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
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- [the namespace of hash_map/hash_set])
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- AC_MSG_RESULT([$ac_cv_cxx_hash_map_header])
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+ AC_MSG_RESULT([$ac_cv_cxx_hash_map])
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else
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else
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AC_MSG_RESULT()
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AC_MSG_RESULT()
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AC_MSG_WARN([could not find an STL hash_map])
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AC_MSG_WARN([could not find an STL hash_map])
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fi
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fi
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])
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])
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+
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