76 lines
3.5 KiB
Plaintext
76 lines
3.5 KiB
Plaintext
# 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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# 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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[
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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_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="$namespace";
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ac_cv_cxx_hash_map_class="unordered_map";])
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fi
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done
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done
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# Now try hash_map
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for location in ext/hash_map hash_map; do
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for namespace in __gnu_cxx "" std stdext; do
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if test -z "$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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if test -n "$ac_cv_cxx_hash_map"; then
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AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
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AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
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if test "$ac_cv_cxx_hash_map_class" = "unordered_map"; then
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AC_DEFINE(HAVE_UNORDERED_MAP, 1, [define if the hash_map class is unordered_map])
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fi
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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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[the name of <hash_map>])
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AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
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[the name of <hash_set>])
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AC_MSG_RESULT([$ac_cv_cxx_hash_map])
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else
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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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fi
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])
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