re PR libstdc++/47058 ("--enable-maintainer-mode --disable-werror" wrongly upgrades warnings to errors in libstdc++)

2012-02-17  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/47058
	* acinclude.m4 (GLIBCXX_ENABLE_WERROR): New.
	(GLIBCXX_EXPORT_FLAGS): Add -Wabi to WARN_FLAGS
	* configure.ac: Use it.
	* fragment.am: Set WERROR_FLAG conditionally on --disable-werror.
	* configure: Regenerate.
	* python/Makefile.in: Same.
	* Makefile.in: Same.
	* doc/Makefile.in: Same.
	* include/Makefile.in: Same.
	* po/Makefile.in: Same.
	* python/Makefile.in: Same.
	* src/Makefile.in: Same.
	* src/c++11/Makefile.in: Same.
	* src/c++98/Makefile.in: Same.
	* testsuite/Makefile.in: Same.

From-SVN: r184349

15 files changed, 117 insertions, 23 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index a9d47ed..617cce6 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,22 @@
+2012-02-17  Benjamin Kosnik  <bkoz@redhat.com>
+
+	PR libstdc++/47058
+	* acinclude.m4 (GLIBCXX_ENABLE_WERROR): New.
+	(GLIBCXX_EXPORT_FLAGS): Add -Wabi to WARN_FLAGS
+	* configure.ac: Use it.
+	* fragment.am: Set WERROR_FLAG conditionally on --disable-werror.
+	* configure: Regenerate.
+	* python/Makefile.in: Same.
+	* Makefile.in: Same.
+	* doc/Makefile.in: Same.
+	* include/Makefile.in: Same.
+	* po/Makefile.in: Same.
+	* python/Makefile.in: Same.
+	* src/Makefile.in: Same.
+	* src/c++11/Makefile.in: Same.
+	* src/c++98/Makefile.in: Same.
+	* testsuite/Makefile.in: Same.
+
 2012-02-17  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	PR libstdc++/52189
diff --git a/libstdc++-v3/Makefile.in b/libstdc++-v3/Makefile.in
index 74fade4..6a66c60 100644
--- a/libstdc++-v3/Makefile.in
+++ b/libstdc++-v3/Makefile.in
@@ -288,6 +288,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -295,7 +297,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index e7ffacc..46a5532 100644
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -729,7 +729,7 @@ AC_DEFUN([GLIBCXX_EXPORT_FLAGS], [
   # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
   AC_SUBST(OPTIMIZE_CXXFLAGS)
 
-  WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
+  WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi'
   AC_SUBST(WARN_FLAGS)
 ])
 
@@ -3591,6 +3591,17 @@ AC_SUBST(python_mod_dir)
 GLIBCXX_CONDITIONAL(ENABLE_PYTHONDIR, test $python_mod_dir != no)
 ])
 
+dnl
+dnl Check to see if -Werror is disabled.
+dnl
+dnl --enable-werror/--disable-werror
+AC_DEFUN([GLIBCXX_ENABLE_WERROR], [
+  AC_MSG_CHECKING([for -Werror])
+  GLIBCXX_ENABLE(werror,$1,,[turns on -Werror])
+  AC_MSG_RESULT($enable_werror)
+  GLIBCXX_CONDITIONAL(ENABLE_WERROR, test $enable_werror = yes)
+])
+
 
 # Macros from the top-level gcc directory.
 m4_include([../config/gc++filt.m4])
diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index 07b2a84..c053be3 100755
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -664,6 +664,8 @@ LIBICONV
 OPT_LDFLAGS
 SECTION_LDFLAGS
 GLIBCXX_LIBS
+ENABLE_WERROR_FALSE
+ENABLE_WERROR_TRUE
 ENABLE_PYTHONDIR_FALSE
 ENABLE_PYTHONDIR_TRUE
 python_mod_dir
@@ -860,6 +862,7 @@ enable_cxx_flags
 enable_fully_dynamic_string
 enable_extern_template
 with_python_dir
+enable_werror
 enable_libstdcxx_time
 enable_tls
 enable_rpath
@@ -1549,6 +1552,7 @@ Optional Features:
                           memory [default=no]
   --enable-extern-template
                           enable extern template [default=yes]
+  --enable-werror         turns on -Werror [default=yes]
   --enable-libstdcxx-time[=KIND]
                           use KIND for check type [default=no]
   --enable-tls            Use thread-local storage [default=yes]
@@ -11495,7 +11499,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11498 "configure"
+#line 11502 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11601,7 +11605,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11604 "configure"
+#line 11608 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14959,7 +14963,7 @@ fi
     #
     # Fake what AC_TRY_COMPILE does.  XXX Look at redoing this new-style.
     cat > conftest.$ac_ext << EOF
-#line 14962 "configure"
+#line 14966 "configure"
 struct S { ~S(); };
 void bar();
 void foo()
@@ -15294,7 +15298,7 @@ $as_echo "$glibcxx_cv_atomic_long_long" >&6; }
   # Fake what AC_TRY_COMPILE does.
 
     cat > conftest.$ac_ext << EOF
-#line 15297 "configure"
+#line 15301 "configure"
 int main()
 {
   typedef bool atomic_type;
@@ -15329,7 +15333,7 @@ $as_echo "$glibcxx_cv_atomic_bool" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15332 "configure"
+#line 15336 "configure"
 int main()
 {
   typedef short atomic_type;
@@ -15364,7 +15368,7 @@ $as_echo "$glibcxx_cv_atomic_short" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15367 "configure"
+#line 15371 "configure"
 int main()
 {
   // NB: _Atomic_word not necessarily int.
@@ -15400,7 +15404,7 @@ $as_echo "$glibcxx_cv_atomic_int" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15403 "configure"
+#line 15407 "configure"
 int main()
 {
   typedef long long atomic_type;
@@ -15480,7 +15484,7 @@ $as_echo "$as_me: WARNING: Performance of certain classes will degrade as a resu
   # unnecessary for this test.
 
     cat > conftest.$ac_ext << EOF
-#line 15483 "configure"
+#line 15487 "configure"
 int main()
 {
   _Decimal32 d1;
@@ -15522,7 +15526,7 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
   # unnecessary for this test.
 
     cat > conftest.$ac_ext << EOF
-#line 15525 "configure"
+#line 15529 "configure"
 template<typename T1, typename T2>
   struct same
   { typedef T2 type; };
@@ -15556,7 +15560,7 @@ $as_echo "$enable_int128" >&6; }
     rm -f conftest*
 
     cat > conftest.$ac_ext << EOF
-#line 15559 "configure"
+#line 15563 "configure"
 template<typename T1, typename T2>
   struct same
   { typedef T2 type; };
@@ -17269,6 +17273,26 @@ python_mod_dir="${with_python_dir}"
 
 
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -Werror" >&5
+$as_echo_n "checking for -Werror... " >&6; }
+   # Check whether --enable-werror was given.
+if test "${enable_werror+set}" = set; then :
+  enableval=$enable_werror;
+      case "$enableval" in
+       yes|no) ;;
+       *) as_fn_error "Argument to enable/disable werror must be yes or no" "$LINENO" 5 ;;
+      esac
+
+else
+  enable_werror=yes
+fi
+
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $enable_werror" >&5
+$as_echo "$enable_werror" >&6; }
+
+
+
 # Checks for operating systems support that doesn't require linking.
 
 
@@ -66123,6 +66147,15 @@ else
 fi
 
 
+    if test $enable_werror = yes; then
+  ENABLE_WERROR_TRUE=
+  ENABLE_WERROR_FALSE='#'
+else
+  ENABLE_WERROR_TRUE='#'
+  ENABLE_WERROR_FALSE=
+fi
+
+
     if test $enable_symvers != no; then
   ENABLE_SYMVERS_TRUE=
   ENABLE_SYMVERS_FALSE='#'
@@ -66399,7 +66432,7 @@ $as_echo "$gxx_include_dir" >&6; }
   # OPTIMIZE_CXXFLAGS = -O3 -fstrict-aliasing -fvtable-gc
 
 
-  WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
+  WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi'
 
 
 
@@ -66580,6 +66613,10 @@ if test -z "${ENABLE_PYTHONDIR_TRUE}" && test -z "${ENABLE_PYTHONDIR_FALSE}"; th
   as_fn_error "conditional \"ENABLE_PYTHONDIR\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${ENABLE_WERROR_TRUE}" && test -z "${ENABLE_WERROR_FALSE}"; then
+  as_fn_error "conditional \"ENABLE_WERROR\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${ENABLE_SYMVERS_TRUE}" && test -z "${ENABLE_SYMVERS_FALSE}"; then
   as_fn_error "conditional \"ENABLE_SYMVERS\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index 81b523f..49de141 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -131,6 +131,7 @@ GLIBCXX_ENABLE_CXX_FLAGS
 GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING([no])
 GLIBCXX_ENABLE_EXTERN_TEMPLATE([yes])
 GLIBCXX_ENABLE_PYTHON
+GLIBCXX_ENABLE_WERROR([yes])
 
 # Checks for operating systems support that doesn't require linking.
 GLIBCXX_CHECK_MATH_PROTO
diff --git a/libstdc++-v3/doc/Makefile.in b/libstdc++-v3/doc/Makefile.in
index 9338934..39c7e1f 100644
--- a/libstdc++-v3/doc/Makefile.in
+++ b/libstdc++-v3/doc/Makefile.in
@@ -272,6 +272,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -279,7 +281,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/fragment.am b/libstdc++-v3/fragment.am
index 2bcbc1a..304d396 100644
--- a/libstdc++-v3/fragment.am
+++ b/libstdc++-v3/fragment.am
@@ -13,12 +13,18 @@ STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
 
+if ENABLE_WERROR
+WERROR_FLAG=$(WERROR)
+else
+WERROR_FLAG=
+endif
+
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
 CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 # -I/-D flags to pass when compiling.
 AM_CPPFLAGS = $(GLIBCXX_INCLUDES)
diff --git a/libstdc++-v3/include/Makefile.in b/libstdc++-v3/include/Makefile.in
index b872ef5..19a7c0e 100644
--- a/libstdc++-v3/include/Makefile.in
+++ b/libstdc++-v3/include/Makefile.in
@@ -262,6 +262,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -269,7 +271,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/libsupc++/Makefile.in b/libstdc++-v3/libsupc++/Makefile.in
index 4d4aeb7..ee65762 100644
--- a/libstdc++-v3/libsupc++/Makefile.in
+++ b/libstdc++-v3/libsupc++/Makefile.in
@@ -322,6 +322,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -329,7 +331,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/po/Makefile.in b/libstdc++-v3/po/Makefile.in
index 2fc769f..4392d89 100644
--- a/libstdc++-v3/po/Makefile.in
+++ b/libstdc++-v3/po/Makefile.in
@@ -262,6 +262,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -269,7 +271,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/python/Makefile.in b/libstdc++-v3/python/Makefile.in
index 7dde04f..f83fac8 100644
--- a/libstdc++-v3/python/Makefile.in
+++ b/libstdc++-v3/python/Makefile.in
@@ -286,6 +286,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -293,7 +295,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/src/Makefile.in b/libstdc++-v3/src/Makefile.in
index 9f5a18f..93ed440 100644
--- a/libstdc++-v3/src/Makefile.in
+++ b/libstdc++-v3/src/Makefile.in
@@ -313,6 +313,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -320,7 +322,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/src/c++11/Makefile.in b/libstdc++-v3/src/c++11/Makefile.in
index 7cc1c8c..b7f362a 100644
--- a/libstdc++-v3/src/c++11/Makefile.in
+++ b/libstdc++-v3/src/c++11/Makefile.in
@@ -280,6 +280,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -287,7 +289,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/src/c++98/Makefile.in b/libstdc++-v3/src/c++98/Makefile.in
index 33afea4..b0e6c14 100644
--- a/libstdc++-v3/src/c++98/Makefile.in
+++ b/libstdc++-v3/src/c++98/Makefile.in
@@ -299,6 +299,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -306,7 +308,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.
diff --git a/libstdc++-v3/testsuite/Makefile.in b/libstdc++-v3/testsuite/Makefile.in
index fc9b31a..0826f05 100644
--- a/libstdc++-v3/testsuite/Makefile.in
+++ b/libstdc++-v3/testsuite/Makefile.in
@@ -265,6 +265,8 @@ PWD_COMMAND = $${PWDCMD-pwd}
 STAMP = echo timestamp >
 toolexecdir = $(glibcxx_toolexecdir)
 toolexeclibdir = $(glibcxx_toolexeclibdir)
+@ENABLE_WERROR_FALSE@WERROR_FLAG = 
+@ENABLE_WERROR_TRUE@WERROR_FLAG = $(WERROR)
 
 # These bits are all figured out from configure.  Look in acinclude.m4
 # or configure.ac to see how they are set.  See GLIBCXX_EXPORT_FLAGS.
@@ -272,7 +274,7 @@ CONFIG_CXXFLAGS = \
 	$(SECTION_FLAGS) $(EXTRA_CXX_FLAGS) -frandom-seed=$@
 
 WARN_CXXFLAGS = \
-	$(WARN_FLAGS) $(WERROR) -fdiagnostics-show-location=once -Wabi
+	$(WARN_FLAGS) $(WERROR_FLAG) -fdiagnostics-show-location=once 
 
 
 # -I/-D flags to pass when compiling.