6 files changed, 58 insertions, 4 deletions
diff --git a/lto-plugin/ChangeLog b/lto-plugin/ChangeLog
index 8ceb13c4dad..3fb20a9c0af 100644
--- a/lto-plugin/ChangeLog
+++ b/lto-plugin/ChangeLog
@@ -1,3 +1,13 @@
+2011-08-10  Richard Guenther  <rguenther@suse.de>
+
+	PR bootstrap/49907
+	lto-plugin/
+	* configure.ac: Use ACX_PROG_CC_WARNING_OPTS to detect -Wall presence.
+	* Makefile.am (AM_CFLAGS): Adjust.  Do not build with -Werror.
+	* configure: Regenerate.
+	* Makefile.in: Likewise.
+	* aclocal.m4: Likewise.
+
 2011-04-20  Jim Meyering  <meyering@redhat.com>
 
 	* lto-plugin.c (free_1, free_2): Remove useless if-before-free.
diff --git a/lto-plugin/Makefile.am b/lto-plugin/Makefile.am
index 4067c43150a..b24015e137b 100644
--- a/lto-plugin/Makefile.am
+++ b/lto-plugin/Makefile.am
@@ -8,7 +8,7 @@ target_noncanonical := @target_noncanonical@
 libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
 
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
-AM_CFLAGS = -Wall -Werror
+AM_CFLAGS = @ac_lto_plugin_warn_cflags@
 AM_LIBTOOLFLAGS = --tag=disable-static
 
 libexecsub_LTLIBRARIES = liblto_plugin.la
diff --git a/lto-plugin/Makefile.in b/lto-plugin/Makefile.in
index 86edb99bfa7..0c8d89fc7e2 100644
--- a/lto-plugin/Makefile.in
+++ b/lto-plugin/Makefile.in
@@ -47,6 +47,7 @@ am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
 	$(top_srcdir)/../config/lead-dot.m4 \
 	$(top_srcdir)/../config/lthostflags.m4 \
 	$(top_srcdir)/../config/override.m4 \
+	$(top_srcdir)/../config/warnings.m4 \
 	$(top_srcdir)/../libtool.m4 $(top_srcdir)/../ltoptions.m4 \
 	$(top_srcdir)/../ltsugar.m4 $(top_srcdir)/../ltversion.m4 \
 	$(top_srcdir)/../lt~obsolete.m4 $(top_srcdir)/configure.ac
@@ -167,6 +168,7 @@ abs_top_builddir = @abs_top_builddir@
 abs_top_srcdir = @abs_top_srcdir@
 ac_ct_CC = @ac_ct_CC@
 ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+ac_lto_plugin_warn_cflags = @ac_lto_plugin_warn_cflags@
 am__include = @am__include@
 am__leading_dot = @am__leading_dot@
 am__quote = @am__quote@
@@ -227,7 +229,7 @@ AUTOMAKE_OPTIONS = no-dependencies
 gcc_version := $(shell cat $(top_srcdir)/../gcc/BASE-VER)
 libexecsubdir := $(libexecdir)/gcc/$(target_noncanonical)/$(gcc_version)
 AM_CPPFLAGS = -I$(top_srcdir)/../include $(DEFS)
-AM_CFLAGS = -Wall -Werror
+AM_CFLAGS = @ac_lto_plugin_warn_cflags@
 AM_LIBTOOLFLAGS = --tag=disable-static
 libexecsub_LTLIBRARIES = liblto_plugin.la
 gcc_build_dir = ../$(host_subdir)/gcc
diff --git a/lto-plugin/aclocal.m4 b/lto-plugin/aclocal.m4
index 7c370a7d01b..ce9a5c2e428 100644
--- a/lto-plugin/aclocal.m4
+++ b/lto-plugin/aclocal.m4
@@ -973,6 +973,7 @@ m4_include([../config/depstand.m4])
 m4_include([../config/lead-dot.m4])
 m4_include([../config/lthostflags.m4])
 m4_include([../config/override.m4])
+m4_include([../config/warnings.m4])
 m4_include([../libtool.m4])
 m4_include([../ltoptions.m4])
 m4_include([../ltsugar.m4])
diff --git a/lto-plugin/configure b/lto-plugin/configure
index c9c84a10511..9815917f8fd 100755
--- a/lto-plugin/configure
+++ b/lto-plugin/configure
@@ -622,6 +622,7 @@ EGREP
 GREP
 SED
 LIBTOOL
+ac_lto_plugin_warn_cflags
 am__fastdepCC_FALSE
 am__fastdepCC_TRUE
 CCDEPMODE
@@ -4040,6 +4041,45 @@ rm -rf conftest*
   fi
 fi
 
+ac_lto_plugin_warn_cflags=
+save_CFLAGS="$CFLAGS"
+for option in -Wall; do
+  as_acx_Woption=`$as_echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports $option" >&5
+$as_echo_n "checking whether $CC supports $option... " >&6; }
+if { as_var=$as_acx_Woption; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  CFLAGS="$option"
+    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$as_acx_Woption=yes"
+else
+  eval "$as_acx_Woption=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+eval ac_res=\$$as_acx_Woption
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  if test `eval 'as_val=${'$as_acx_Woption'};$as_echo "$as_val"'` = yes; then :
+  ac_lto_plugin_warn_cflags="$ac_lto_plugin_warn_cflags${ac_lto_plugin_warn_cflags:+ }$option"
+fi
+  done
+CFLAGS="$save_CFLAGS"
+
 case `pwd` in
   *\ * | *\	*)
     { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: Libtool does not cope well with whitespace in \`pwd\`" >&5
@@ -10498,7 +10538,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10501 "configure"
+#line 10541 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10604,7 +10644,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 10607 "configure"
+#line 10647 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/lto-plugin/configure.ac b/lto-plugin/configure.ac
index 1aba69713f7..9a418d231fe 100644
--- a/lto-plugin/configure.ac
+++ b/lto-plugin/configure.ac
@@ -6,6 +6,7 @@ AM_INIT_AUTOMAKE([foreign no-dist])
 AM_MAINTAINER_MODE
 AC_PROG_CC
 AC_SYS_LARGEFILE
+ACX_PROG_CC_WARNING_OPTS([-Wall], [ac_lto_plugin_warn_cflags])
 AM_PROG_LIBTOOL
 ACX_LT_HOST_FLAGS
 AC_SUBST(target_noncanonical)