Patchwork RFA: v3 PATCH to add on_quick_exit/quick_exit to std

login
register
mail settings
Submitter Jason Merrill
Date Feb. 11, 2013, 5:33 p.m.
Message ID <51192B59.4000305@redhat.com>
Download mbox | patch
Permalink /patch/219655/
State New
Headers show

Comments

Jason Merrill - Feb. 11, 2013, 5:33 p.m.
While I was going over the C++11 status page, I noticed that quick_exit 
is implemented by glibc, it just needed to be added to the libstdc++ 
cstdlib header.

Does this configury/feature macro handling look right?  Is this enough 
testcase?  Is this small/safe enough to go in for 4.8?
Benjamin Kosnik - Feb. 11, 2013, 5:46 p.m.
> Does this configury/feature macro handling look right? 

yes.

> Is this enough testcase? 

yes.

> Is this small/safe enough to go in for 4.8?

yes.
 
> commit 884a2a7815a95bade9d23f01b4c64a16808c7f05
> Author: Jason Merrill <jason@redhat.com>
> Date:   Mon Feb 11 11:23:30 2013 -0500
> 
>     	* 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.


thanks Jason

-benjamin
Paolo Carlini - Feb. 11, 2013, 5:57 p.m.
Hi,

On 02/11/2013 06:33 PM, Jason Merrill wrote:
> While I was going over the C++11 status page, I noticed that 
> quick_exit is implemented by glibc, it just needed to be added to the 
> libstdc++ cstdlib header.
>
> Does this configury/feature macro handling look right?  Is this enough 
> testcase?  Is this small/safe enough to go in for 4.8?
I'm only not sure we want to add the new C++11 functions to c_std too, 
besides c_global, because normally we don't, AFAIK. But Benjamin 
invented the split c_std / c_global, I'm only raising a trivial 
consistency issue.

Thanks!
Paolo.
Paolo Carlini - Feb. 11, 2013, 6:35 p.m.
.. also, I think we should have #if __cplusplus >= 201103L protecting 
these functions too, exactly like all the other C++11 bits. Eg, I don't 
think we should unconditionally, ie in C++03 mode too, declare 
at_quick_exit and quick_exit in namespace std.

I can tweak things for the two issues I noticed.

Paolo.
Benjamin Kosnik - Feb. 11, 2013, 6:54 p.m.
> .. also, I think we should have #if __cplusplus >= 201103L protecting 
> these functions too, exactly like all the other C++11 bits. Eg, I
> don't think we should unconditionally, ie in C++03 mode too, declare 
> at_quick_exit and quick_exit in namespace std.

Yeah.
 
> I can tweak things for the two issues I noticed.

Thanks. 

It seems like this is still 4.8 material to me.

-benjamin
Paolo Carlini - Feb. 11, 2013, 7:01 p.m.
On 02/11/2013 07:54 PM, Benjamin De Kosnik wrote:
>> I can tweak things for the two issues I noticed.
> Thanks.
>
> It seems like this is still 4.8 material to me.
Great. I'll take care of that later today. I'm also going to make sure 
the new testcase doesn't spuriously fail if the functions aren't 
actually available.

Paolo.
Rainer Orth - Feb. 14, 2013, 3:45 p.m.
Jason Merrill <jason@redhat.com> writes:

> While I was going over the C++11 status page, I noticed that quick_exit is
> implemented by glibc, it just needed to be added to the libstdc++ cstdlib
> header.

The test fails on Solaris 9:

FAIL: 18_support/quick_exit/quick_exit.cc (test for excess errors)
Excess errors:
/vol/gcc/src/hg/trunk/local/libstdc++-v3/testsuite/18_support/quick_exit/quick_e
xit.cc:28:3: error: '_Exit' is not a member of 'std'

WARNING: 18_support/quick_exit/quick_exit.cc compilation failed to produce execu
table
extra_tool_flags are:
 -std=gnu++11

_Exit seems to be a C99 addition, only present since Solaris 10.

	Rainer

Patch

commit 884a2a7815a95bade9d23f01b4c64a16808c7f05
Author: Jason Merrill <jason@redhat.com>
Date:   Mon Feb 11 11:23:30 2013 -0500

    	* 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.

diff --git a/libstdc++-v3/include/c_global/cstdlib b/libstdc++-v3/include/c_global/cstdlib
index c249c78..0eb0129 100644
--- a/libstdc++-v3/include/c_global/cstdlib
+++ b/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;
diff --git a/libstdc++-v3/linkage.m4 b/libstdc++-v3/linkage.m4
index b24f455..45a09cd 100644
--- a/libstdc++-v3/linkage.m4
+++ b/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)
 
diff --git a/libstdc++-v3/testsuite/18_support/quick_exit/quick_exit.cc b/libstdc++-v3/testsuite/18_support/quick_exit/quick_exit.cc
new file mode 100644
index 0000000..54ee41e
--- /dev/null
+++ b/libstdc++-v3/testsuite/18_support/quick_exit/quick_exit.cc
@@ -0,0 +1,39 @@ 
+// 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);
+}
diff --git a/libstdc++-v3/config.h.in b/libstdc++-v3/config.h.in
index dd14b91..59a7fae 100644
--- a/libstdc++-v3/config.h.in
+++ b/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
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index a4cf5c9..008ccbf 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -26223,6 +26223,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -33125,6 +33241,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -38940,6 +39172,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -44770,6 +45118,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -51274,6 +51738,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -57443,6 +58023,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -63638,6 +64334,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
@@ -69506,6 +70318,122 @@  done
   CXXFLAGS='-fno-builtin -D_GNU_SOURCE'
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for at_quick_exit declaration" >&5
+$as_echo_n "checking for at_quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_at_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_at_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ at_quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_at_quick_exit_use=yes
+else
+  glibcxx_cv_func_at_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_at_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_at_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_at_quick_exit_use = x"yes"; then
+    for ac_func in at_quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "at_quick_exit" "ac_cv_func_at_quick_exit"
+if test "x$ac_cv_func_at_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_AT_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for quick_exit declaration" >&5
+$as_echo_n "checking for quick_exit declaration... " >&6; }
+  if test x${glibcxx_cv_func_quick_exit_use+set} != xset; then
+    if test "${glibcxx_cv_func_quick_exit_use+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+
+
+      ac_ext=cpp
+ac_cpp='$CXXCPP $CPPFLAGS'
+ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
+
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <stdlib.h>
+int
+main ()
+{
+ quick_exit(0);
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_compile "$LINENO"; then :
+  glibcxx_cv_func_quick_exit_use=yes
+else
+  glibcxx_cv_func_quick_exit_use=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+      ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+
+  fi
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $glibcxx_cv_func_quick_exit_use" >&5
+$as_echo "$glibcxx_cv_func_quick_exit_use" >&6; }
+  if test x$glibcxx_cv_func_quick_exit_use = x"yes"; then
+    for ac_func in quick_exit
+do :
+  ac_fn_c_check_func "$LINENO" "quick_exit" "ac_cv_func_quick_exit"
+if test "x$ac_cv_func_quick_exit" = x""yes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_QUICK_EXIT 1
+_ACEOF
+
+fi
+done
+
+  fi
+
+
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for strtold declaration" >&5
 $as_echo_n "checking for strtold declaration... " >&6; }
   if test x${glibcxx_cv_func_strtold_use+set} != xset; then
diff --git a/libstdc++-v3/include/c_std/cstdlib b/libstdc++-v3/include/c_std/cstdlib
index 224fccf..9d2f51e 100644
--- a/libstdc++-v3/include/c_std/cstdlib
+++ b/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;