revert: acinclude.m4 ([GLIBCXX_ENABLE_ATOMIC_BUILTINS]): Do link tests when possible.

2009-05-06  Paolo Carlini  <paolo.carlini@oracle.com>

	Revert:
	2009-05-03  Paolo Carlini  <paolo.carlini@oracle.com>

	* acinclude.m4 ([GLIBCXX_ENABLE_ATOMIC_BUILTINS]): Do link tests when
	possible.
	* configure: Regenerate.

From-SVN: r147154

3 files changed, 50 insertions, 462 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 3ff387c..c7ec6f5 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,12 @@
+2009-05-06  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	Revert:
+	2009-05-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* acinclude.m4 ([GLIBCXX_ENABLE_ATOMIC_BUILTINS]): Do link tests when
+	possible.
+	* configure: Regenerate.
+
 2009-05-05  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	PR libstdc++/39909
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 2d046e9..186916c 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -2429,7 +2429,8 @@ dnl is intended to be an all-or-nothing switch, so all the atomic operations
 dnl that are used should be checked.
 dnl
 dnl Note:
-dnl libgomp and libgfortran use a link test, see CHECK_SYNC_FETCH_AND_ADD.
+dnl libgomp and libgfortran do this with a link test, instead of an asm test.
+dnl see: CHECK_SYNC_FETCH_AND_ADD
 dnl
 dnl Defines:
 dnl  _GLIBCXX_ATOMIC_BUILTINS_1 
@@ -2441,110 +2442,12 @@ AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
   AC_LANG_SAVE
   AC_LANG_CPLUSPLUS
   old_CXXFLAGS="$CXXFLAGS"
-
-  # Do link tests if possible, instead asm tests.
-  if test x$gcc_no_link != xyes; then  
-
-  # Can do link tests.
-
-  CXXFLAGS="$CXXFLAGS -fno-exceptions"
-
-  AC_MSG_CHECKING([for atomic builtins for bool])
-  AC_CACHE_VAL(glibcxx_cv_atomic_bool, [
-    AC_TRY_LINK(
-      [ ],
-      [typedef bool atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();],
-      [glibcxx_cv_atomic_bool=yes],
-      [glibcxx_cv_atomic_bool=no])
-  ])    
-  if test $glibcxx_cv_atomic_bool = yes; then
-    AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_1, 1,
-      [Define if builtin atomic operations for bool are supported on this host.])
-  fi
-  AC_MSG_RESULT($glibcxx_cv_atomic_bool)
-
-  AC_MSG_CHECKING([for atomic builtins for short])
-  AC_CACHE_VAL(glibcxx_cv_atomic_short, [
-    AC_TRY_LINK(
-      [ ],
-      [typedef short atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();],
-      [glibcxx_cv_atomic_short=yes],
-      [glibcxx_cv_atomic_short=no])
-  ])    
-  if test $glibcxx_cv_atomic_short = yes; then
-    AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_2, 1,
-      [Define if builtin atomic operations for short are supported on this host.])
-  fi
-  AC_MSG_RESULT($glibcxx_cv_atomic_short)
-
-  AC_MSG_CHECKING([for atomic builtins for int])
-  AC_CACHE_VAL(glibcxx_cv_atomic_int, [
-    AC_TRY_LINK(
-      [ ],
-      [typedef int atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();],
-      [glibcxx_cv_atomic_int=yes],
-      [glibcxx_cv_atomic_int=no])
-  ])    
-  if test $glibcxx_cv_atomic_int = yes; then
-    AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_4, 1,
-      [Define if builtin atomic operations for int are supported on this host.])
-  fi
-  AC_MSG_RESULT($glibcxx_cv_atomic_int)
-
-  AC_MSG_CHECKING([for atomic builtins for long long])
-  AC_CACHE_VAL(glibcxx_cv_atomic_long_long, [
-    AC_TRY_LINK(
-      [ ],
-      [typedef long long atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();],
-      [glibcxx_cv_atomic_long_long=yes],
-      [glibcxx_cv_atomic_long_long=no])
-  ])    
-  if test $glibcxx_cv_atomic_long_long = yes; then
-    AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_8, 1,
-      [Define if builtin atomic operations for long long are supported on this host.])
-  fi
-  AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
-
-  else
-
-  # Do asm tests.
-
+  
   # Compile unoptimized.
   CXXFLAGS='-O0 -S'
 
-  # Fake what AC_TRY_COMPILE does.
+  # Fake what AC_TRY_COMPILE does, without linking as this is
+  # unnecessary for a builtins test.
 
     cat > conftest.$ac_ext << EOF
 [#]line __oline__ "configure"
@@ -2566,14 +2469,14 @@ EOF
     AC_MSG_CHECKING([for atomic builtins for bool])
     if AC_TRY_EVAL(ac_compile); then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_bool=no
+        enable_atomic_builtinsb=no
       else
       AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_1, 1,
       [Define if builtin atomic operations for bool are supported on this host.])
-        glibcxx_cv_atomic_bool=yes
+        enable_atomic_builtinsb=yes
       fi
     fi
-    AC_MSG_RESULT($glibcxx_cv_atomic_bool)
+    AC_MSG_RESULT($enable_atomic_builtinsb)
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
@@ -2596,14 +2499,14 @@ EOF
     AC_MSG_CHECKING([for atomic builtins for short])
     if AC_TRY_EVAL(ac_compile); then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_short=no
+        enable_atomic_builtinss=no
       else
       AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_2, 1,
       [Define if builtin atomic operations for short are supported on this host.])
-        glibcxx_cv_atomic_short=yes
+        enable_atomic_builtinss=yes
       fi
     fi
-    AC_MSG_RESULT($glibcxx_cv_atomic_short)
+    AC_MSG_RESULT($enable_atomic_builtinss)
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
@@ -2627,14 +2530,14 @@ EOF
     AC_MSG_CHECKING([for atomic builtins for int])
     if AC_TRY_EVAL(ac_compile); then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_int=no
+        enable_atomic_builtinsi=no
       else
       AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_4, 1,
         [Define if builtin atomic operations for int are supported on this host.])
-        glibcxx_cv_atomic_int=yes
+        enable_atomic_builtinsi=yes
       fi
     fi
-    AC_MSG_RESULT($glibcxx_cv_atomic_int)
+    AC_MSG_RESULT($enable_atomic_builtinsi)
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
@@ -2657,23 +2560,22 @@ EOF
     AC_MSG_CHECKING([for atomic builtins for long long])
     if AC_TRY_EVAL(ac_compile); then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_long_long=no
+        enable_atomic_builtinsll=no
       else
       AC_DEFINE(_GLIBCXX_ATOMIC_BUILTINS_8, 1,
       [Define if builtin atomic operations for long long are supported on this host.])
-        glibcxx_cv_atomic_long_long=yes
+        enable_atomic_builtinsll=yes
       fi
     fi
-    AC_MSG_RESULT($glibcxx_cv_atomic_long_long)
+    AC_MSG_RESULT($enable_atomic_builtinsll)
     rm -f conftest*
 
-  fi
 
   CXXFLAGS="$old_CXXFLAGS"
   AC_LANG_RESTORE
 
   # Set atomicity_dir to builtins if either of above tests pass.
-  if test $glibcxx_cv_atomic_int = yes || test $glibcxx_cv_atomic_bool = yes ; then
+  if test $enable_atomic_builtinsi = yes || test $enable_atomic_builtinsb = yes ; then
     atomicity_dir=cpu/generic/atomicity_builtins
   fi
 
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 98429fb..31678eb 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -14757,336 +14757,14 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
   old_CXXFLAGS="$CXXFLAGS"
 
-  # Do link tests if possible, instead asm tests.
-  if test x$gcc_no_link != xyes; then
-
-  # Can do link tests.
-
-  CXXFLAGS="$CXXFLAGS -fno-exceptions"
-
-  echo "$as_me:$LINENO: checking for atomic builtins for bool" >&5
-echo $ECHO_N "checking for atomic builtins for bool... $ECHO_C" >&6
-  if test "${glibcxx_cv_atomic_bool+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-
-    if test x$gcc_no_link = xyes; then
-  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
-echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
-   { (exit 1); exit 1; }; }
-fi
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-int
-main ()
-{
-typedef bool atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_cxx_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  glibcxx_cv_atomic_bool=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-glibcxx_cv_atomic_bool=no
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-
-fi
-
-  if test $glibcxx_cv_atomic_bool = yes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define _GLIBCXX_ATOMIC_BUILTINS_1 1
-_ACEOF
-
-  fi
-  echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_bool" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_bool" >&6
-
-  echo "$as_me:$LINENO: checking for atomic builtins for short" >&5
-echo $ECHO_N "checking for atomic builtins for short... $ECHO_C" >&6
-  if test "${glibcxx_cv_atomic_short+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-
-    if test x$gcc_no_link = xyes; then
-  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
-echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
-   { (exit 1); exit 1; }; }
-fi
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-int
-main ()
-{
-typedef short atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_cxx_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  glibcxx_cv_atomic_short=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-glibcxx_cv_atomic_short=no
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-
-fi
-
-  if test $glibcxx_cv_atomic_short = yes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define _GLIBCXX_ATOMIC_BUILTINS_2 1
-_ACEOF
-
-  fi
-  echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_short" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_short" >&6
-
-  echo "$as_me:$LINENO: checking for atomic builtins for int" >&5
-echo $ECHO_N "checking for atomic builtins for int... $ECHO_C" >&6
-  if test "${glibcxx_cv_atomic_int+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-
-    if test x$gcc_no_link = xyes; then
-  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
-echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
-   { (exit 1); exit 1; }; }
-fi
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-int
-main ()
-{
-typedef int atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_cxx_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  glibcxx_cv_atomic_int=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-glibcxx_cv_atomic_int=no
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-
-fi
-
-  if test $glibcxx_cv_atomic_int = yes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define _GLIBCXX_ATOMIC_BUILTINS_4 1
-_ACEOF
-
-  fi
-  echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_int" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_int" >&6
-
-  echo "$as_me:$LINENO: checking for atomic builtins for long long" >&5
-echo $ECHO_N "checking for atomic builtins for long long... $ECHO_C" >&6
-  if test "${glibcxx_cv_atomic_long_long+set}" = set; then
-  echo $ECHO_N "(cached) $ECHO_C" >&6
-else
-
-    if test x$gcc_no_link = xyes; then
-  { { echo "$as_me:$LINENO: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&5
-echo "$as_me: error: Link tests are not allowed after GCC_NO_EXECUTABLES." >&2;}
-   { (exit 1); exit 1; }; }
-fi
-cat >conftest.$ac_ext <<_ACEOF
-/* confdefs.h.  */
-_ACEOF
-cat confdefs.h >>conftest.$ac_ext
-cat >>conftest.$ac_ext <<_ACEOF
-/* end confdefs.h.  */
-
-int
-main ()
-{
-typedef long long atomic_type;
-       atomic_type c1;
-       atomic_type c2;
-       const atomic_type c3(0);
-       __sync_fetch_and_add(&c1, c2);
-       __sync_val_compare_and_swap(&c1, c3, c2);
-       __sync_lock_test_and_set(&c1, c3);
-       __sync_lock_release(&c1);
-       __sync_synchronize();
-  ;
-  return 0;
-}
-_ACEOF
-rm -f conftest.$ac_objext conftest$ac_exeext
-if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
-  (eval $ac_link) 2>conftest.er1
-  ac_status=$?
-  grep -v '^ *+' conftest.er1 >conftest.err
-  rm -f conftest.er1
-  cat conftest.err >&5
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); } &&
-	 { ac_try='test -z "$ac_cxx_werror_flag"
-			 || test ! -s conftest.err'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; } &&
-	 { ac_try='test -s conftest$ac_exeext'
-  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  echo "$as_me:$LINENO: \$? = $ac_status" >&5
-  (exit $ac_status); }; }; then
-  glibcxx_cv_atomic_long_long=yes
-else
-  echo "$as_me: failed program was:" >&5
-sed 's/^/| /' conftest.$ac_ext >&5
-
-glibcxx_cv_atomic_long_long=no
-fi
-rm -f conftest.err conftest.$ac_objext \
-      conftest$ac_exeext conftest.$ac_ext
-
-fi
-
-  if test $glibcxx_cv_atomic_long_long = yes; then
-
-cat >>confdefs.h <<\_ACEOF
-#define _GLIBCXX_ATOMIC_BUILTINS_8 1
-_ACEOF
-
-  fi
-  echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_long_long" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_long_long" >&6
-
-  else
-
-  # Do asm tests.
-
   # Compile unoptimized.
   CXXFLAGS='-O0 -S'
 
-  # Fake what AC_TRY_COMPILE does.
+  # Fake what AC_TRY_COMPILE does, without linking as this is
+  # unnecessary for a builtins test.
 
     cat > conftest.$ac_ext << EOF
-#line 15089 "configure"
+#line 14767 "configure"
 int main()
 {
   typedef bool atomic_type;
@@ -15110,22 +14788,22 @@ echo $ECHO_N "checking for atomic builtins for bool... $ECHO_C" >&6
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_bool=no
+        enable_atomic_builtinsb=no
       else
 
 cat >>confdefs.h <<\_ACEOF
 #define _GLIBCXX_ATOMIC_BUILTINS_1 1
 _ACEOF
 
-        glibcxx_cv_atomic_bool=yes
+        enable_atomic_builtinsb=yes
       fi
     fi
-    echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_bool" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_bool" >&6
+    echo "$as_me:$LINENO: result: $enable_atomic_builtinsb" >&5
+echo "${ECHO_T}$enable_atomic_builtinsb" >&6
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15128 "configure"
+#line 14806 "configure"
 int main()
 {
   typedef short atomic_type;
@@ -15149,22 +14827,22 @@ echo $ECHO_N "checking for atomic builtins for short... $ECHO_C" >&6
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_short=no
+        enable_atomic_builtinss=no
       else
 
 cat >>confdefs.h <<\_ACEOF
 #define _GLIBCXX_ATOMIC_BUILTINS_2 1
 _ACEOF
 
-        glibcxx_cv_atomic_short=yes
+        enable_atomic_builtinss=yes
       fi
     fi
-    echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_short" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_short" >&6
+    echo "$as_me:$LINENO: result: $enable_atomic_builtinss" >&5
+echo "${ECHO_T}$enable_atomic_builtinss" >&6
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15167 "configure"
+#line 14845 "configure"
 int main()
 {
   // NB: _Atomic_word not necessarily int.
@@ -15189,22 +14867,22 @@ echo $ECHO_N "checking for atomic builtins for int... $ECHO_C" >&6
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_int=no
+        enable_atomic_builtinsi=no
       else
 
 cat >>confdefs.h <<\_ACEOF
 #define _GLIBCXX_ATOMIC_BUILTINS_4 1
 _ACEOF
 
-        glibcxx_cv_atomic_int=yes
+        enable_atomic_builtinsi=yes
       fi
     fi
-    echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_int" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_int" >&6
+    echo "$as_me:$LINENO: result: $enable_atomic_builtinsi" >&5
+echo "${ECHO_T}$enable_atomic_builtinsi" >&6
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15207 "configure"
+#line 14885 "configure"
 int main()
 {
   typedef long long atomic_type;
@@ -15228,21 +14906,20 @@ echo $ECHO_N "checking for atomic builtins for long long... $ECHO_C" >&6
   echo "$as_me:$LINENO: \$? = $ac_status" >&5
   (exit $ac_status); }; then
       if grep __sync_ conftest.s >/dev/null 2>&1 ; then
-        glibcxx_cv_atomic_long_long=no
+        enable_atomic_builtinsll=no
       else
 
 cat >>confdefs.h <<\_ACEOF
 #define _GLIBCXX_ATOMIC_BUILTINS_8 1
 _ACEOF
 
-        glibcxx_cv_atomic_long_long=yes
+        enable_atomic_builtinsll=yes
       fi
     fi
-    echo "$as_me:$LINENO: result: $glibcxx_cv_atomic_long_long" >&5
-echo "${ECHO_T}$glibcxx_cv_atomic_long_long" >&6
+    echo "$as_me:$LINENO: result: $enable_atomic_builtinsll" >&5
+echo "${ECHO_T}$enable_atomic_builtinsll" >&6
     rm -f conftest*
 
-  fi
 
   CXXFLAGS="$old_CXXFLAGS"
   ac_ext=c
@@ -15253,7 +14930,7 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
   # Set atomicity_dir to builtins if either of above tests pass.
-  if test $glibcxx_cv_atomic_int = yes || test $glibcxx_cv_atomic_bool = yes ; then
+  if test $enable_atomic_builtinsi = yes || test $enable_atomic_builtinsb = yes ; then
     atomicity_dir=cpu/generic/atomicity_builtins
   fi