From fbaaef999ba563838ebd00874ed8a1c01fbf286d Mon Sep 17 00:00:00 2001
From: Wink Saville <wink@google.com>
Date: Thu, 27 May 2010 16:25:37 -0700
Subject: Add protobuf 2.2.0a sources

This is the contents of protobuf-2.2.0a.tar.bz2 from
http://code.google.com/p/protobuf/downloads/list and
is the base code for the javamicro code generator.

Change-Id: Ie9a0440a824d615086445b6636944484b3155afa
---
 m4/stl_hash.m4 | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 m4/stl_hash.m4

(limited to 'm4/stl_hash.m4')

diff --git a/m4/stl_hash.m4 b/m4/stl_hash.m4
new file mode 100644
index 0000000..912b954
--- /dev/null
+++ b/m4/stl_hash.m4
@@ -0,0 +1,43 @@
+# 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=""
+   for location in ext/hash_map hash_map; do
+     for namespace in __gnu_cxx "" std stdext; do
+       if test -z "$ac_cv_cxx_hash_map"; then
+         AC_TRY_COMPILE([#include <$location>],
+                        [${namespace}::hash_map<int, int> t],
+                        [ac_cv_cxx_hash_map="<$location>";
+                         ac_cv_cxx_hash_namespace="$namespace";])
+       fi
+     done
+   done
+   ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
+   if test -n "$ac_cv_cxx_hash_map"; then
+      AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
+      AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
+      AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
+                         [the location of <hash_map>])
+      AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
+                         [the location of <hash_set>])
+      AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
+                         [the namespace of hash_map/hash_set])
+      AC_MSG_RESULT([$ac_cv_cxx_hash_map])
+   else
+      AC_MSG_RESULT()
+      AC_MSG_WARN([could not find an STL hash_map])
+   fi
+])
-- 
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