From 8356f2d009e20e5ca567f5f9456a40f75e9560dc Mon Sep 17 00:00:00 2001
From: Cary Coutant <ccoutant@google.com>
Date: Wed, 18 Dec 2013 15:53:05 -0800
Subject: Add configure checks for <unordered_set> and <unordered_map>.

gold/
	* configure.ac: Check for <unordered_set> and <unordered_map>.
	* config.in: Regenerate.
	* configure: Regenerate.
	* system.h: Use <unordered_set> and <unordered_map> if available.
---
 gold/ChangeLog    |  7 +++++++
 gold/config.in    |  6 ++++++
 gold/configure    | 14 ++++++++++++++
 gold/configure.ac |  1 +
 gold/system.h     | 17 +++++++++++++++--
 5 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/gold/ChangeLog b/gold/ChangeLog
index ea67ee9..2e26946 100644
--- a/gold/ChangeLog
+++ b/gold/ChangeLog
@@ -1,3 +1,10 @@
+2013-12-18  Cary Coutant  <ccoutant@google.com>
+
+	* configure.ac: Check for <unordered_set> and <unordered_map>.
+	* config.in: Regenerate.
+	* configure: Regenerate.
+	* system.h: Use <unordered_set> and <unordered_map> if available.
+
 2013-12-10  Roland McGrath  <mcgrathr@google.com>
 
 	* Makefile.am (install-exec-local): Prefix $(INSTALL_PROGRAM) uses
diff --git a/gold/config.in b/gold/config.in
index d46fd75..be77810 100644
--- a/gold/config.in
+++ b/gold/config.in
@@ -187,6 +187,12 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define to 1 if you have the <unordered_map> header file. */
+#undef HAVE_UNORDERED_MAP
+
+/* Define to 1 if you have the <unordered_set> header file. */
+#undef HAVE_UNORDERED_SET
+
 /* Define to 1 if you have the <windows.h> header file. */
 #undef HAVE_WINDOWS_H
 
diff --git a/gold/configure b/gold/configure
index 24140cf..2257324 100755
--- a/gold/configure
+++ b/gold/configure
@@ -7133,6 +7133,20 @@ ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ex
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
+for ac_header in unordered_set unordered_map
+do :
+  as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ac_fn_cxx_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
+eval as_val=\$$as_ac_Header
+   if test "x$as_val" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
+_ACEOF
+
+fi
+
+done
+
 for ac_header in tr1/unordered_set tr1/unordered_map
 do :
   as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
diff --git a/gold/configure.ac b/gold/configure.ac
index 9bc216b..b2741cf 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -523,6 +523,7 @@ AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strvers
 
 AC_LANG_PUSH(C++)
 
+AC_CHECK_HEADERS(unordered_set unordered_map)
 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
 AC_CHECK_HEADERS(byteswap.h)
diff --git a/gold/system.h b/gold/system.h
index 3e6fe1d..aea3723 100644
--- a/gold/system.h
+++ b/gold/system.h
@@ -57,8 +57,21 @@
 
 // Figure out how to get a hash set and a hash map.
 
-#if defined(HAVE_TR1_UNORDERED_SET) && defined(HAVE_TR1_UNORDERED_MAP) \
-    && defined(HAVE_TR1_UNORDERED_MAP_REHASH)
+#if defined(HAVE_UNORDERED_SET) && defined(HAVE_UNORDERED_MAP)
+
+#include <unordered_set>
+#include <unordered_map>
+
+// We need a template typedef here.
+
+#define Unordered_set std::unordered_set
+#define Unordered_map std::unordered_map
+#define Unordered_multimap std::unordered_multimap
+
+#define reserve_unordered_map(map, n) ((map)->rehash(n))
+
+#elif defined(HAVE_TR1_UNORDERED_SET) && defined(HAVE_TR1_UNORDERED_MAP) \
+      && defined(HAVE_TR1_UNORDERED_MAP_REHASH)
 
 #include <tr1/unordered_set>
 #include <tr1/unordered_map>
-- 
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