Support exception propagation without lock-free atomic int

2017-01-04  Pauli Nieminen  <suokkos@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/64735
	* acinclude.m4 (GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER): Define.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver [HAVE_EXCEPTION_PTR_SINCE_GCC46]
	(GLIBCXX_3.4.15, GLIBCXX_3.4.21, CXXABI_1.3.3, CXXABI_1.3.5): Make
	exports for exception_ptr, nested_exception, and future conditional.
	[HAVE_EXCEPTION_PTR_SINCE_GCC46] (GLIBCXX_3.4.23, CXXABI_1.3.11): Add
	exports for exception_ptr, nested_exception, and future conditional.
	* configure: Regenerate.
	* configure.ac: Use GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER.
	* include/std/future: Remove check for ATOMIC_INT_LOCK_FREE
	* libsupc++/eh_atomics.h: New file for internal use only.
	(__eh_atomic_inc, __eh_atomic_dec): New.
	* libsupc++/eh_ptr.cc (exception_ptr::_M_addref)
	(exception_ptr::_M_release) (__gxx_dependent_exception_cleanup)
	(rethrow_exception): Use eh_atomics.h reference counting helpers.
	* libsupc++/eh_throw.cc (__gxx_exception_cleanup): Likewise.
	* libsupc++/eh_tm.cc (free_any_cxa_exception): Likewise.
	* libsupc++/exception: Remove check for ATOMIC_INT_LOCK_FREE.
	* libsupc++/exception_ptr.h: Likewise.
	* libsupc++/guard.cc: Include header for ATOMIC_INT_LOCK_FREE macro.
	* libsupc++/nested_exception.cc: Remove check for
	ATOMIC_INT_LOCK_FREE.
	* libsupc++/nested_exception.h: Likewise.
	* src/c++11/future.cc: Likewise.
	* testsuite/18_support/exception_ptr/*: Remove atomic builtins checks.
	* testsuite/18_support/nested_exception/*: Likewise.
	* testsuite/30_threads/async/*: Likewise.
	* testsuite/30_threads/future/*: Likewise.
	* testsuite/30_threads/headers/future/types_std_c++0x.cc: Likewise.
	* testsuite/30_threads/packaged_task/*: Likewise.
	* testsuite/30_threads/promise/*: Likewise.
	* testsuite/30_threads/shared_future/*: Likewise.

Co-Authored-By: Jonathan Wakely <jwakely@redhat.com>

From-SVN: r244051

libstdc++-v3/ChangeLog

+2017-01-04  Pauli Nieminen  <suokkos@gmail.com>
+	    Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/64735
+	* acinclude.m4 (GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER): Define.
+	* config.h.in: Regenerate.
+	* config/abi/pre/gnu.ver [HAVE_EXCEPTION_PTR_SINCE_GCC46]
+	(GLIBCXX_3.4.15, GLIBCXX_3.4.21, CXXABI_1.3.3, CXXABI_1.3.5): Make
+	exports for exception_ptr, nested_exception, and future conditional.
+	[HAVE_EXCEPTION_PTR_SINCE_GCC46] (GLIBCXX_3.4.23, CXXABI_1.3.11): Add
+	exports for exception_ptr, nested_exception, and future conditional.
+	* configure: Regenerate.
+	* configure.ac: Use GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER.
+	* include/std/future: Remove check for ATOMIC_INT_LOCK_FREE
+	* libsupc++/eh_atomics.h: New file for internal use only.
+	(__eh_atomic_inc, __eh_atomic_dec): New.
+	* libsupc++/eh_ptr.cc (exception_ptr::_M_addref)
+	(exception_ptr::_M_release) (__gxx_dependent_exception_cleanup)
+	(rethrow_exception): Use eh_atomics.h reference counting helpers.
+	* libsupc++/eh_throw.cc (__gxx_exception_cleanup): Likewise.
+	* libsupc++/eh_tm.cc (free_any_cxa_exception): Likewise.
+	* libsupc++/exception: Remove check for ATOMIC_INT_LOCK_FREE.
+	* libsupc++/exception_ptr.h: Likewise.
+	* libsupc++/guard.cc: Include header for ATOMIC_INT_LOCK_FREE macro.
+	* libsupc++/nested_exception.cc: Remove check for
+	ATOMIC_INT_LOCK_FREE.
+	* libsupc++/nested_exception.h: Likewise.
+	* src/c++11/future.cc: Likewise.
+	* testsuite/18_support/exception_ptr/*: Remove atomic builtins checks.
+	* testsuite/18_support/nested_exception/*: Likewise.
+	* testsuite/30_threads/async/*: Likewise.
+	* testsuite/30_threads/future/*: Likewise.
+	* testsuite/30_threads/headers/future/types_std_c++0x.cc: Likewise.
+	* testsuite/30_threads/packaged_task/*: Likewise.
+	* testsuite/30_threads/promise/*: Likewise.
+	* testsuite/30_threads/shared_future/*: Likewise.
+
 2017-01-03  Gerald Pfeifer  <gerald@pfeifer.com>
 
 	* doc/xml/manual/documentation_hacking.xml: sourceforge.net now

libstdc++-v3/acinclude.m4

@@ -4480,6 +4480,43 @@ AC_DEFUN([GLIBCXX_CHECK_SIZE_T_MANGLING], [
     [Define to the letter to which size_t is mangled.])
 ])
 
+dnl
+dnl Determine whether std::exception_ptr symbols should be exported with
+dnl the symbol versions from GCC 4.6.0 or GCC 7.1.0, depending on which
+dnl release first added support for std::exception_ptr. Originally it was
+dnl only supported for targets with always-lock-free atomics for int, but
+dnl since GCC 7.1 it is supported for all targets.
+dnl
+AC_DEFUN([GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER], [
+  if test $enable_symvers != no; then
+    AC_MSG_CHECKING([for first version to support std::exception_ptr])
+    case ${target} in
+      aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
+      m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
+        ac_exception_ptr_since_gcc46=yes
+        ;;
+      *)
+        # If the value of this macro changes then we will need to hardcode
+        # yes/no here for additional targets based on the original value.
+        AC_TRY_COMPILE([], [
+          #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
+          # error atomic int not always lock free
+          #endif
+          ],
+          [ac_exception_ptr_since_gcc46=yes],
+          [ac_exception_ptr_since_gcc46=no])
+        ;;
+    esac
+    if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
+      AC_DEFINE(HAVE_EXCEPTION_PTR_SINCE_GCC46, 1,
+        [Define to 1 if GCC 4.6 supported std::exception_ptr for the target])
+      AC_MSG_RESULT([4.6.0])
+    else
+      AC_MSG_RESULT([7.1.0])
+    fi
+  fi
+])
+
 # Macros from the top-level gcc directory.
 m4_include([../config/gc++filt.m4])
 m4_include([../config/tls.m4])

libstdc++-v3/config.h.in

@@ -123,6 +123,9 @@
 /* Define if EWOULDBLOCK exists. */
 #undef HAVE_EWOULDBLOCK
 
+/* Define to 1 if GCC 4.6 supported std::exception_ptr for the target */
+#undef HAVE_EXCEPTION_PTR_SINCE_GCC46
+
 /* Define to 1 if you have the <execinfo.h> header file. */
 #undef HAVE_EXECINFO_H
 

libstdc++-v3/config/abi/pre/gnu.ver

@@ -1503,6 +1503,9 @@ GLIBCXX_3.4.15 {
     _ZNSt14error_categoryC*;
     _ZNSt14error_categoryD*;
 
+#ifdef HAVE_EXCEPTION_PTR_SINCE_GCC46
+    # std::future symbols are only present in this version when
+    # atomic operations on int are always lock-free.
     _ZNSt13__future_base12_Result_baseC*;
     _ZNSt13__future_base12_Result_baseD*;
     _ZTINSt13__future_base12_Result_baseE;
@@ -1511,6 +1514,7 @@ GLIBCXX_3.4.15 {
     _ZNSt13__future_base11_State_baseD*;
     _ZTINSt13__future_base11_State_baseE;
     _ZTVNSt13__future_base11_State_baseE;
+#endif
 
 } GLIBCXX_3.4.14;
 
@@ -1687,8 +1691,10 @@ GLIBCXX_3.4.21 {
 
     # std::notify_all_at_thread_exit
     _ZSt25notify_all_at_thread_exitRSt18condition_variableSt11unique_lockISt5mutexE;
+#ifdef HAVE_EXCEPTION_PTR_SINCE_GCC46
     # std::__future_base::_State_baseV2::_Make_ready::_M_set()
     _ZNSt13__future_base13_State_baseV211_Make_ready6_M_setEv;
+#endif
 
     # ABI-tagged std::basic_string
     _ZNSt7__cxx1112basic_stringI[cw]St11char_traitsI[cw]ESaI[cw]EE1[01]**;
@@ -1947,6 +1953,16 @@ GLIBCXX_3.4.23 {
     _ZNSsC[12]ERKSs[jmy]RKSaIcE;
     _ZNSbIwSt11char_traitsIwESaIwEEC[12]ERKS2_mRKS1_;
 
+#ifndef HAVE_EXCEPTION_PTR_SINCE_GCC46
+    # std::future symbols are exported in the first version to support
+    # std::exception_ptr
+    _ZNSt13__future_base12_Result_baseC*;
+    _ZNSt13__future_base12_Result_baseD*;
+    _ZTINSt13__future_base12_Result_baseE;
+    _ZTVNSt13__future_base12_Result_baseE;
+    _ZNSt13__future_base13_State_baseV211_Make_ready6_M_setEv;
+#endif
+
 } GLIBCXX_3.4.22;
 
 # Symbols in the support library (libsupc++) have their own tag.
@@ -2080,6 +2096,7 @@ CXXABI_1.3.3 {
     _ZTIPDi;
     _ZTIPKDi;
 
+#ifdef HAVE_EXCEPTION_PTR_SINCE_GCC46
     # exception_ptr
     _ZNSt15__exception_ptr13exception_ptrC1Ev;
     _ZNSt15__exception_ptr13exception_ptrC2Ev;
@@ -2099,6 +2116,7 @@ CXXABI_1.3.3 {
 
     _ZSt17current_exceptionv;
     _ZSt17rethrow_exceptionNSt15__exception_ptr13exception_ptrE;
+#endif
 
 } CXXABI_1.3.2;
 
@@ -2129,10 +2147,12 @@ CXXABI_1.3.5 {
     # FNV hash.
     _ZSt15_Fnv_hash_bytesPKv*;
 
+#ifdef HAVE_EXCEPTION_PTR_SINCE_GCC46
     # std::nested_exception
     _ZNSt16nested_exceptionD*;
     _ZTISt16nested_exception;
     _ZTVSt16nested_exception;
+#endif
 
 } CXXABI_1.3.4;
 
@@ -2209,6 +2229,33 @@ CXXABI_1.3.11 {
     _ZdaPvSt11align_val_tRKSt9nothrow_t;
     _ZdaPv[jmy]St11align_val_t;
 
+#ifndef HAVE_EXCEPTION_PTR_SINCE_GCC46
+    # exception_ptr
+    _ZNSt15__exception_ptr13exception_ptrC1Ev;
+    _ZNSt15__exception_ptr13exception_ptrC2Ev;
+    _ZNSt15__exception_ptr13exception_ptrC1ERKS0_;
+    _ZNSt15__exception_ptr13exception_ptrC2ERKS0_;
+    _ZNSt15__exception_ptr13exception_ptrC1EMS0_FvvE;
+    _ZNSt15__exception_ptr13exception_ptrC2EMS0_FvvE;
+    _ZNSt15__exception_ptr13exception_ptrD1Ev;
+    _ZNSt15__exception_ptr13exception_ptrD2Ev;
+    _ZNSt15__exception_ptr13exception_ptraSERKS0_;
+    _ZNKSt15__exception_ptr13exception_ptrcvMS0_FvvEEv;
+    _ZNKSt15__exception_ptr13exception_ptrntEv;
+    _ZNKSt15__exception_ptr13exception_ptr20__cxa_exception_typeEv;
+    _ZNSt15__exception_ptr13exception_ptr4swapERS0_;
+    _ZNSt15__exception_ptreqERKNS_13exception_ptrES2_;
+    _ZNSt15__exception_ptrneERKNS_13exception_ptrES2_;
+
+    _ZSt17current_exceptionv;
+    _ZSt17rethrow_exceptionNSt15__exception_ptr13exception_ptrE;
+
+    # std::nested_exception
+    _ZNSt16nested_exceptionD*;
+    _ZTISt16nested_exception;
+    _ZTVSt16nested_exception;
+#endif
+
 } CXXABI_1.3.10;
 
 # Symbols in the support library (libsupc++) supporting transactional memory.

libstdc++-v3/configure

@@ -80664,6 +80664,55 @@ _ACEOF
 
 
 
+# Check which release added std::exception_ptr for the target
+
+  if test $enable_symvers != no; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for first version to support std::exception_ptr" >&5
+$as_echo_n "checking for first version to support std::exception_ptr... " >&6; }
+    case ${target} in
+      aarch64-*-* | alpha-*-* | hppa*-*-* | i?86-*-* | x86_64-*-* | \
+      m68k-*-* | powerpc*-*-* | s390*-*-* | *-*-solaris* )
+        ac_exception_ptr_since_gcc46=yes
+        ;;
+      *)
+        # If the value of this macro changes then we will need to hardcode
+        # yes/no here for additional targets based on the original value.
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+          #if __GCC_ATOMIC_INT_LOCK_FREE <= 1
+          # error atomic int not always lock free
+          #endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_exception_ptr_since_gcc46=yes
+else
+  ac_exception_ptr_since_gcc46=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+        ;;
+    esac
+    if test x"$ac_exception_ptr_since_gcc46" = x"yes" ; then
+
+$as_echo "#define HAVE_EXCEPTION_PTR_SINCE_GCC46 1" >>confdefs.h
+
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: 4.6.0" >&5
+$as_echo "4.6.0" >&6; }
+    else
+      { $as_echo "$as_me:${as_lineno-$LINENO}: result: 7.1.0" >&5
+$as_echo "7.1.0" >&6; }
+    fi
+  fi
+
+
 # Define documentation rules conditionally.
 
 # See if makeinfo has been installed and is modern enough

libstdc++-v3/configure.ac

@@ -419,6 +419,9 @@ GLIBCXX_CHECK_FILESYSTEM_DEPS
 # For Transactional Memory TS
 GLIBCXX_CHECK_SIZE_T_MANGLING
 
+# Check which release added std::exception_ptr for the target
+GLIBCXX_CHECK_EXCEPTION_PTR_SYMVER
+
 # Define documentation rules conditionally.
 
 # See if makeinfo has been installed and is modern enough

libstdc++-v3/include/std/future

@@ -192,8 +192,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     future<__async_result_of<_Fn, _Args...>>
     async(_Fn&& __fn, _Args&&... __args);
 
-#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
-  && (ATOMIC_INT_LOCK_FREE > 1)
+#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
 
   /// Base class and enclosing scope.
   struct __future_base
@@ -1751,7 +1750,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #endif // _GLIBCXX_ASYNC_ABI_COMPAT
 #endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
-       // && ATOMIC_INT_LOCK_FREE
 
   // @} group futures
 _GLIBCXX_END_NAMESPACE_VERSION

libstdc++-v3/libsupc++/eh_atomics.h

+// Exception Handling support header for -*- C++ -*-
+
+// Copyright (C) 2016 Free Software Foundation, Inc.
+//
+// This file is part of GCC.
+//
+// GCC 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.
+//
+// GCC 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.
+//
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file eh_atomics.h
+ *  This is an internal header file, included by library source files.
+ *  Do not attempt to use it directly.
+ */
+
+#ifndef _EH_ATOMICS_H
+#define _EH_ATOMICS_H 1
+
+#include <bits/c++config.h>
+#include <bits/atomic_word.h>
+#include <bits/atomic_lockfree_defines.h>
+#if ATOMIC_INT_LOCK_FREE <= 1
+# include <ext/atomicity.h>
+#endif
+
+#pragma GCC visibility push(default)
+extern "C++" {
+namespace __gnu_cxx
+{
+  void
+  __eh_atomic_inc (_Atomic_word* __count) __attribute__((always_inline));
+
+  bool
+  __eh_atomic_dec (_Atomic_word* __count) __attribute__((always_inline));
+
+  // Increments the count.
+  inline void
+  __eh_atomic_inc (_Atomic_word* __count)
+  {
+#if ATOMIC_INT_LOCK_FREE > 1
+    __atomic_add_fetch (__count, 1, __ATOMIC_ACQ_REL);
+#else
+    _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE (__count);
+    __gnu_cxx::__atomic_add_dispatch (__count, 1);
+    _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER (__count);
+#endif
+  }
+
+  // Decrements the count and returns true if it reached zero.
+  inline bool
+  __eh_atomic_dec (_Atomic_word* __count)
+  {
+#if ATOMIC_INT_LOCK_FREE > 1
+    return __atomic_sub_fetch (__count, 1, __ATOMIC_ACQ_REL) == 0;
+#else
+    _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE (__count);
+    if (__gnu_cxx::__exchange_and_add_dispatch (__count, -1) == 1)
+      {
+	_GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER (__count);
+	return true;
+      }
+    return false;
+#endif
+  }
+} // namespace __gnu_cxx
+}
+#pragma GCC visibility pop
+
+#endif // _EH_ATOMICS_H

libstdc++-v3/libsupc++/eh_ptr.cc

@@ -23,9 +23,7 @@
 // <http://www.gnu.org/licenses/>.
 
 #include <bits/c++config.h>
-#include <bits/atomic_lockfree_defines.h>
-
-#if ATOMIC_INT_LOCK_FREE > 1
+#include "eh_atomics.h"
 
 #define _GLIBCXX_EH_PTR_COMPAT
 
@@ -101,7 +99,7 @@ std::__exception_ptr::exception_ptr::_M_addref() noexcept
     {
       __cxa_refcounted_exception *eh =
 	__get_refcounted_exception_header_from_obj (_M_exception_object);
-      __atomic_add_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL);
+      __gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
     }
 }
 
@@ -113,7 +111,7 @@ std::__exception_ptr::exception_ptr::_M_release() noexcept
     {
       __cxa_refcounted_exception *eh =
 	__get_refcounted_exception_header_from_obj (_M_exception_object);
-      if (__atomic_sub_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
+      if (__gnu_cxx::__eh_atomic_dec (&eh->referenceCount))
         {
 	  if (eh->exc.exceptionDestructor)
 	    eh->exc.exceptionDestructor (_M_exception_object);
@@ -211,7 +209,7 @@ __gxx_dependent_exception_cleanup(_Unwind_Reason_Code code,
 
   __cxa_free_dependent_exception (dep);
 
-  if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
+  if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
     {
       if (header->exc.exceptionDestructor)
 	header->exc.exceptionDestructor (header + 1);
@@ -230,7 +228,7 @@ std::rethrow_exception(std::exception_ptr ep)
 
   __cxa_dependent_exception *dep = __cxa_allocate_dependent_exception ();
   dep->primaryException = obj;
-  __atomic_add_fetch (&eh->referenceCount, 1,  __ATOMIC_ACQ_REL);
+  __gnu_cxx::__eh_atomic_inc (&eh->referenceCount);
 
   dep->unexpectedHandler = get_unexpected ();
   dep->terminateHandler = get_terminate ();
@@ -252,5 +250,3 @@ std::rethrow_exception(std::exception_ptr ep)
 }
 
 #undef _GLIBCXX_EH_PTR_COMPAT
-
-#endif

libstdc++-v3/libsupc++/eh_throw.cc

@@ -24,6 +24,7 @@
 
 #include <bits/c++config.h>
 #include "unwind-cxx.h"
+#include "eh_atomics.h"
 
 using namespace __cxxabiv1;
 
@@ -42,17 +43,13 @@ __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
   if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
     __terminate (header->exc.terminateHandler);
 
-#if ATOMIC_INT_LOCK_FREE > 1
-  if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
+  if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
     {
-#endif
       if (header->exc.exceptionDestructor)
 	header->exc.exceptionDestructor (header + 1);
 
       __cxa_free_exception (header + 1);
-#if ATOMIC_INT_LOCK_FREE > 1
     }
-#endif
 }
 
 extern "C" __cxa_refcounted_exception*

libstdc++-v3/libsupc++/eh_tm.cc

@@ -24,6 +24,7 @@
 
 #include <cstdlib>
 #include "unwind-cxx.h"
+#include "eh_atomics.h"
 
 using namespace __cxxabiv1;
 
@@ -45,9 +46,7 @@ free_any_cxa_exception (_Unwind_Exception *eo)
       __cxa_free_dependent_exception (dep);
     }
 
-#if __GCC_ATOMIC_INT_LOCK_FREE > 1
-  if (__atomic_sub_fetch (&h->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
-#endif
+  if (__gnu_cxx::__eh_atomic_dec (&h->referenceCount))
     __cxa_free_exception (h + 1);
 }
 

libstdc++-v3/libsupc++/exception

@@ -35,7 +35,6 @@
 #pragma GCC visibility push(default)
 
 #include <bits/c++config.h>
-#include <bits/atomic_lockfree_defines.h>
 #include <bits/exception.h>
 
 extern "C++" {
@@ -139,7 +138,7 @@ _GLIBCXX_END_NAMESPACE_VERSION
 
 #pragma GCC visibility pop
 
-#if (__cplusplus >= 201103L) && (ATOMIC_INT_LOCK_FREE > 1)
+#if (__cplusplus >= 201103L)
 #include <bits/exception_ptr.h>
 #include <bits/nested_exception.h>
 #endif

libstdc++-v3/libsupc++/exception_ptr.h

@@ -39,10 +39,6 @@
 #include <typeinfo>
 #include <new>
 
-#if ATOMIC_INT_LOCK_FREE < 2
-#  error This platform does not support exception propagation.
-#endif
-
 extern "C++" {
 
 namespace std 

libstdc++-v3/libsupc++/guard.cc

@@ -30,6 +30,7 @@
 #include <new>
 #include <ext/atomicity.h>
 #include <ext/concurrence.h>
+#include <bits/atomic_lockfree_defines.h>
 #if defined(__GTHREADS) && defined(__GTHREAD_HAS_COND) \
   && (ATOMIC_INT_LOCK_FREE > 1) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
 # include <climits>

libstdc++-v3/libsupc++/nested_exception.cc

@@ -25,7 +25,5 @@
 
 namespace std 
 {
-#if ATOMIC_INT_LOCK_FREE > 1
   nested_exception::~nested_exception() noexcept = default;
-#endif
 } // namespace std

libstdc++-v3/libsupc++/nested_exception.h

@@ -39,10 +39,6 @@
 #include <bits/c++config.h>
 #include <bits/move.h>
 
-#if ATOMIC_INT_LOCK_FREE < 2
-#  error This platform does not support exception propagation.
-#endif
-
 extern "C++" {
 
 namespace std

libstdc++-v3/src/c++11/future.cc

@@ -78,8 +78,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   const char*
   future_error::what() const noexcept { return logic_error::what(); }
 
-#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1) \
-  && (ATOMIC_INT_LOCK_FREE > 1)
+#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)
   __future_base::_Result_base::_Result_base() = default;
 
   __future_base::_Result_base::~_Result_base() = default;

libstdc++-v3/testsuite/18_support/exception_ptr/40296.cc

 // { dg-do compile { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/60612-terminate.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/60612-unexpected.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/62258.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2015-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/64241.cc

@@ -17,7 +17,6 @@
 
 // { dg-options "-fno-exceptions -O0" }
 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 #include <exception>
 #include <testsuite_hooks.h>

libstdc++-v3/testsuite/18_support/exception_ptr/current_exception.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // 2008-05-25  Sebastian Redl  <sebastian.redl@getdesigned.at>
 

libstdc++-v3/testsuite/18_support/exception_ptr/lifespan.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // 2008-05-25  Sebastian Redl  <sebastian.redl@getdesigned.at>
 

libstdc++-v3/testsuite/18_support/exception_ptr/make_exception_ptr.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/make_exception_ptr_2.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/move.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/requirements.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/requirements_neg.cc

 // { dg-do compile { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/exception_ptr/rethrow_exception.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // 2008-05-25  Sebastian Redl  <sebastian.redl@getdesigned.at>
 

libstdc++-v3/testsuite/18_support/nested_exception/51438.cc

 // { dg-do compile { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/62154.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/68139.cc

 // { dg-do compile { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2015-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/cons.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/nested_ptr.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/rethrow_if_nested.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/rethrow_nested.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/18_support/nested_exception/throw_with_nested.cc

 // { dg-do run { target c++11 } }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/42819.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/49668.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/54297.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 // { dg-require-sleep "" }
 
 // Copyright (C) 2012-2017 Free Software Foundation, Inc.

libstdc++-v3/testsuite/30_threads/async/any.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/async.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/except.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/forced_unwind.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/launch.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/async/lwg2021.cc

@@ -20,7 +20,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // LWG 2021. Further incorrect usages of result_of
 // Arguments to result_of should use decay.

libstdc++-v3/testsuite/30_threads/async/sync.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/cons/assign_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/cons/constexpr.cc

@@ -2,7 +2,6 @@
 // { dg-options "-fno-inline -g0" }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 // { dg-final { scan-assembler-not "_ZNSt6futureIvEC2Ev" } }
 // { dg-final { scan-assembler-not "_ZNSt6futureIiEC2Ev" } }
 

libstdc++-v3/testsuite/30_threads/future/cons/copy_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/cons/default.cc

 // { dg-do run { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/cons/move.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/cons/move_assign.cc

 // { dg-do run { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/45133.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/get.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/get2.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/share.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/valid.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/wait.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/wait_for.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/members/wait_until.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/future/requirements/explicit_instantiation.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/headers/future/types_std_c++0x.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" } 
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/49668.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/60564.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/1.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/2.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/3.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/56492.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2013-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/alloc.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/alloc2.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/alloc_min.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/assign_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/copy_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/move.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/cons/move_assign.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/forced_unwind.cc

 // { dg-do run { target *-*-linux* *-*-gnu* } }
 // { dg-options "-pthread" { target *-*-linux* *-*-gnu* *-*-solaris* } }
 // { dg-require-effective-target c++11 }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/at_thread_exit.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/get_future.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/get_future2.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/invoke.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/invoke2.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/invoke3.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/invoke4.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/invoke5.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/reset.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/reset2.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/swap.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/members/valid.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/requirements/explicit_instantiation.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/packaged_task/uses_allocator.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/60966.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/69106.cc

@@ -18,7 +18,6 @@
 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 #include <future>
 

libstdc++-v3/testsuite/30_threads/promise/cons/1.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/cons/alloc.cc

@@ -3,7 +3,6 @@
 // { dg-require-effective-target c++11 }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2010-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/cons/alloc2.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/cons/alloc_min.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2011-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/cons/assign_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //

libstdc++-v3/testsuite/30_threads/promise/cons/copy_neg.cc

 // { dg-do compile { target c++11 } }
 // { dg-require-cstdint "" }
 // { dg-require-gthreads "" }
-// { dg-require-atomic-builtins "" }
 
 // Copyright (C) 2009-2017 Free Software Foundation, Inc.
 //