Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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44 lines
1.9 KiB
44 lines
1.9 KiB
17 years ago
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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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# 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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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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AC_LANG_CPLUSPLUS
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ac_cv_cxx_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="$namespace";])
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fi
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done
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done
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ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
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if test -n "$ac_cv_cxx_hash_map"; then
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AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
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AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
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AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
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[the location of <hash_map>])
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AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
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[the location of <hash_set>])
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AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$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])
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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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