linkage.m4 (GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE): New.

	* linkage.m4 (GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE): New.
	(GLIBCXX_CHECK_STDLIB_SUPPORT): Check for atexit and at_quick_exit.
	* include/c_std/cstdlib: Add atexit and at_quick_exit.
	* include/c_global/cstdlib: Add atexit and at_quick_exit.
	* testsuite/18_support/quick_exit/quick_exit.cc: New.

From-SVN: r195948

libstdc++-v3/ChangeLog

+2013-02-11  Jason Merrill  <jason@redhat.com>
+
+	* linkage.m4 (GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE): New.
+	(GLIBCXX_CHECK_STDLIB_SUPPORT): Check for atexit and at_quick_exit.
+	* config.h.in, configure: Regenerate.
+	* include/c_std/cstdlib: Add atexit and at_quick_exit.
+	* include/c_global/cstdlib: Add atexit and at_quick_exit.
+	* testsuite/18_support/quick_exit/quick_exit.cc: New.
+
 2013-02-11  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR libstdc++/56282

libstdc++-v3/config.h.in

@@ -27,6 +27,9 @@
 /* Define to 1 if you have the `atanl' function. */
 #undef HAVE_ATANL
 
+/* Define to 1 if you have the `at_quick_exit' function. */
+#undef HAVE_AT_QUICK_EXIT
+
 /* Define to 1 if the target assembler supports thread-local storage. */
 #undef HAVE_CC_TLS
 
@@ -303,6 +306,9 @@
 /* Define to 1 if you have the `qfpclass' function. */
 #undef HAVE_QFPCLASS
 
+/* Define to 1 if you have the `quick_exit' function. */
+#undef HAVE_QUICK_EXIT
+
 /* Define to 1 if you have the `setenv' function. */
 #undef HAVE_SETENV
 

libstdc++-v3/include/c_global/cstdlib

@@ -57,6 +57,8 @@ namespace std
   extern "C" void abort(void) throw () _GLIBCXX_NORETURN;
   extern "C" int atexit(void (*)()) throw ();
   extern "C" void exit(int) throw () _GLIBCXX_NORETURN;
+  extern "C" int at_quick_exit(void (*)()) throw ();
+  extern "C" void quick_exit(int) throw() _GLIBCXX_NORETURN;
 } // namespace std
 
 #else
@@ -67,6 +69,7 @@ namespace std
 #undef abort
 #undef abs
 #undef atexit
+#undef at_quick_exit
 #undef atof
 #undef atoi
 #undef atol
@@ -83,6 +86,7 @@ namespace std
 #undef mbstowcs
 #undef mbtowc
 #undef qsort
+#undef quick_exit
 #undef rand
 #undef realloc
 #undef srand
@@ -103,6 +107,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::abort;
   using ::abs;
   using ::atexit;
+#ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+  using ::at_quick_exit;
+#endif
   using ::atof;
   using ::atoi;
   using ::atol;
@@ -121,6 +128,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::mbtowc;
 #endif // _GLIBCXX_HAVE_MBSTATE_T
   using ::qsort;
+#ifdef _GLIBCXX_HAVE_QUICK_EXIT
+  using ::quick_exit;
+#endif
   using ::rand;
   using ::realloc;
   using ::srand;

libstdc++-v3/include/c_std/cstdlib

@@ -57,6 +57,8 @@ namespace std
   extern "C" void abort(void) throw () _GLIBCXX_NORETURN;
   extern "C" int atexit(void (*)()) throw ();
   extern "C" void exit(int) throw () _GLIBCXX_NORETURN;
+  extern "C" int at_quick_exit(void (*)()) throw ();
+  extern "C" void quick_exit(int) throw() _GLIBCXX_NORETURN;
 } // namespace
 
 #else
@@ -67,6 +69,7 @@ namespace std
 #undef abort
 #undef abs
 #undef atexit
+#undef at_quick_exit
 #undef atof
 #undef atoi
 #undef atol
@@ -83,6 +86,7 @@ namespace std
 #undef mbstowcs
 #undef mbtowc
 #undef qsort
+#undef quick_exit
 #undef rand
 #undef realloc
 #undef srand
@@ -103,6 +107,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::abort;
   using ::abs;
   using ::atexit;
+#ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
+  using ::at_quick_exit;
+#endif
   using ::atof;
   using ::atoi;
   using ::atol;
@@ -121,6 +128,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   using ::mbtowc;
 #endif // _GLIBCXX_HAVE_MBSTATE_T
   using ::qsort;
+#ifdef _GLIBCXX_HAVE_QUICK_EXIT
+  using ::quick_exit;
+#endif
   using ::rand;
   using ::realloc;
   using ::srand;

libstdc++-v3/linkage.m4

@@ -239,6 +239,35 @@ dnl 2) has "C" linkage
 dnl
 dnl argument 1 is name of function to check
 dnl
+dnl ASSUMES argument is a stdlib function with ONE parameter
+dnl
+dnl GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1
+AC_DEFUN([GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1], [
+  AC_MSG_CHECKING([for $1 declaration])
+  if test x${glibcxx_cv_func_$1_use+set} != xset; then
+    AC_CACHE_VAL(glibcxx_cv_func_$1_use, [
+      AC_LANG_SAVE
+      AC_LANG_CPLUSPLUS
+      AC_TRY_COMPILE([#include <stdlib.h>],
+                     [ $1(0);],
+                     [glibcxx_cv_func_$1_use=yes], [glibcxx_cv_func_$1_use=no])
+      AC_LANG_RESTORE
+    ])
+  fi
+  AC_MSG_RESULT($glibcxx_cv_func_$1_use)
+  if test x$glibcxx_cv_func_$1_use = x"yes"; then
+    AC_CHECK_FUNCS($1)
+  fi
+])
+
+
+dnl
+dnl Check to see if the (stdlib function) argument passed is
+dnl 1) declared when using the c++ compiler
+dnl 2) has "C" linkage
+dnl
+dnl argument 1 is name of function to check
+dnl
 dnl ASSUMES argument is a stdlib function with TWO parameters
 dnl
 dnl GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2
@@ -306,6 +335,8 @@ AC_DEFUN([GLIBCXX_CHECK_STDLIB_SUPPORT], [
   ac_save_CXXFLAGS="$CXXFLAGS"
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
+  GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1(at_quick_exit)
+  GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_1(quick_exit)
   GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2(strtold)
   GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2(strtof)
 

libstdc++-v3/testsuite/18_support/quick_exit/quick_exit.cc

+// 2013-02-11 Jason Merrill
+
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 18.5 - Start and termination
+
+#include <cstdlib>
+
+void handler()
+{
+  std::_Exit(0);
+}
+
+void wrong_handler()
+{
+  std::abort();
+}
+
+int main()
+{
+  std::at_quick_exit (handler);
+  std::atexit (wrong_handler);
+  std::quick_exit (1);
+}