config:

	* warnings.m4: New file.
libcpp:
	* configure.ac: Move AC_PROG_MAKE_SET, AC_PROG_INSTALL to
	programs cluster. Use ACX_PROG_CC_WARNING_OPTS,
	ACX_PROG_CC_WARNING_ALMOST_PEDANTIC, ACX_PROG_CC_WARNINGS_ARE_ERRORS.
	* aclocal.m4, configure: Regenerate.
	* init.c: Include localedir.h.
	* Makefile.in (WARN_CFLAGS, ALL_CFLAGS): New variables.
	(DEFS): Delete.
	(.c.o): Use $(ALL_CFLAGS).
	(localedir.h, localedir.hs): New rules.
	(clean): Use rm -rf to remove directories.
	(distclean): Also delete localedir.h and localedir.hs.
	(init.o): Update dependencies.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@88074 138bc75d-0d04-0410-961f-82ee72b054a4

8 files changed, 306 insertions, 13 deletions

diff --git a/config/ChangeLog b/config/ChangeLog
index 08b315d6edb..5e417bdd259 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,7 @@
+2004-09-24  Zack Weinberg  <zack@codesourcery.com>
+
+	* warnings.m4: New file.
+
 2004-09-23  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR bootstrap/17369
diff --git a/config/warnings.m4 b/config/warnings.m4
new file mode 100644
index 00000000000..5501be92046
--- /dev/null
+++ b/config/warnings.m4
@@ -0,0 +1,97 @@
+# Autoconf include file defining macros related to compile-time warnings.
+
+# Copyright 2004 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 2, 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.
+
+#You should have received a copy of the GNU General Public License
+#along with GCC; see the file COPYING.  If not, write to the Free
+#Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+#02111-1307, USA.
+
+# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz])
+#   Sets @WARN_CFLAGS@ to the subset of the given options which the
+#   compiler accepts.
+AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
+[AC_REQUIRE([AC_PROG_CC])dnl
+AC_SUBST([WARN_CFLAGS])dnl
+WARN_CFLAGS=
+save_CFLAGS="$CFLAGS"
+for option in $1; do
+  AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
+  AC_CACHE_CHECK([whether $CC supports $option], acx_Woption,
+    [CFLAGS="$option"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
+      [AS_VAR_SET(acx_Woption, yes)],
+      [AS_VAR_SET(acx_Woption, no)])
+  ])
+  AS_IF([test AS_VAR_GET(acx_Woption) = yes],
+        [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"])
+  AS_VAR_POPDEF([acx_Woption])dnl
+done
+CFLAGS="$save_CFLAGS"
+])# ACX_PROG_CC_WARNING_OPTS
+
+# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...])
+#   Sets WARN_PEDANTIC to "-pedantic" + the argument, if the compiler
+#   accepts all of those options simultaneously, otherwise to nothing.
+AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
+[AC_REQUIRE([AC_PROG_CC])dnl
+AC_SUBST([WARN_PEDANTIC])dnl
+AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl
+WARN_PEDANTIC=
+AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,
+[save_CFLAGS="$CFLAGS"
+CFLAGS="-pedantic $1"
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
+   [AS_VAR_SET(acx_Pedantic, yes)],
+   [AS_VAR_SET(acx_Pedantic, no)])
+CFLAGS="$save_CFLAGS"])
+AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
+      [WARN_PEDANTIC="-pedantic $1"])
+AS_VAR_POPDEF([acx_Pedantic])dnl
+])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC
+
+# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z])
+#   sets WERROR to "-Werror" if the compiler is GCC >=x.y.z, or if
+#   --enable-werror-always was given on the command line, otherwise
+#   to nothing.
+#   If the argument is the word "manual" instead of a version number,
+#   then WERROR will be set to -Werror only if --enable-werror-always
+#   appeared on the configure command line.
+AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS],
+[AC_REQUIRE([AC_PROG_CC])dnl
+AC_SUBST([WERROR])dnl
+WERROR=
+AC_ARG_ENABLE(werror-always, 
+    AS_HELP_STRING([--enable-werror-always],
+		   [enable -Werror despite compiler version]),
+[], [enable_werror_always=no])
+AS_IF([test $enable_werror_always = yes],
+      [WERROR=-Werror],
+ m4_if($1, [manual],,
+ [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl
+  AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers,
+    [set fnord `echo $1 | tr '.' ' '`
+     shift
+     AC_PREPROC_IFELSE(
+[#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
+  < [$]1 * 10000 + [$]2 * 100 + [$]3
+#error insufficient
+#endif],
+   [AS_VAR_SET(acx_GCCvers, yes)],
+   [AS_VAR_SET(acx_GCCvers, no)])])
+ AS_IF([test AS_VAR_GET(acx_GCCvers) = yes],
+       [WERROR=-WerrorB])
+  AS_VAR_POPDEF([acx_GCCvers])]))
+])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index 9203c5b6b81..839b559fad6 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,3 +1,18 @@
+2004-09-24  Zack Weinberg  <zack@codesourcery.com>
+
+	* configure.ac: Move AC_PROG_MAKE_SET, AC_PROG_INSTALL to
+	programs cluster. Use ACX_PROG_CC_WARNING_OPTS,
+	ACX_PROG_CC_WARNING_ALMOST_PEDANTIC, ACX_PROG_CC_WARNINGS_ARE_ERRORS.
+	* aclocal.m4, configure: Regenerate.
+	* init.c: Include localedir.h.
+	* Makefile.in (WARN_CFLAGS, ALL_CFLAGS): New variables.
+	(DEFS): Delete.
+	(.c.o): Use $(ALL_CFLAGS).
+	(localedir.h, localedir.hs): New rules.
+	(clean): Use rm -rf to remove directories.
+	(distclean): Also delete localedir.h and localedir.hs.
+	(init.o): Update dependencies.
+
 2004-09-22  Kelley Cook  <kcook@gcc.gnu.org>
 
 	* Makefile.in (aclocal.m4): Update dependencies.
diff --git a/libcpp/Makefile.in b/libcpp/Makefile.in
index 9158d670f26..9c89a25c152 100644
--- a/libcpp/Makefile.in
+++ b/libcpp/Makefile.in
@@ -34,6 +34,7 @@ AUTOHEADER = @AUTOHEADER@
 CATALOGS = @CATALOGS@
 CC = @CC@
 CFLAGS = @CFLAGS@
+WARN_CFLAGS = @WARN_CFLAGS@ @WARN_PEDANTIC@ @WERROR@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
 EXEEXT = @EXEEXT@
@@ -59,10 +60,11 @@ prefix = @prefix@
 
 MSGMERGE = msgmerge
 mkinstalldirs = $(SHELL) $(srcdir)/../mkinstalldirs
-DEFS = -DLOCALEDIR="\"$(localedir)\""
 INCLUDES = -I$(srcdir) -I. -I$(srcdir)/../include @INCINTL@ \
 	-I$(srcdir)/include
 
+ALL_CFLAGS = $(CFLAGS) $(WARN_CFLAGS) $(INCLUDES) $(CPPFLAGS)
+
 libcpp_a_OBJS = charset.o directives.o errors.o expr.o files.o \
 	identifiers.o init.o lex.o line-map.o macro.o mkdeps.o \
 	pch.o symtab.o traditional.o
@@ -116,7 +118,15 @@ stamp-h1: $(srcdir)/config.in config.status
 $(srcdir)/config.in: @MAINT@ $(srcdir)/configure
 	cd $(srcdir) && $(AUTOHEADER)
 	-rm -f stamp-h1
-	
+
+# It is not possible to get LOCALEDIR defined in config.h because
+# the value it needs to be defined to is only determined in the
+# Makefile.  Hence we do this instead.
+localedir.h: localedir.hs; @true
+localedir.hs: Makefile
+	echo "#define LOCALEDIR \"$(localedir)\"" > localedir.new
+	$(srcdir)/../move-if-change localedir.new localedir.h
+	echo timestamp > localedir.hs
 
 # Installation rules and other phony targets
 
@@ -150,11 +160,12 @@ mostlyclean:
 	-rm -f *.o
 
 clean: mostlyclean
-	-rm -f makedepend$(EXEEXT) libcpp.a $(srcdir)/autom4te.cache
+	-rm -rf makedepend$(EXEEXT) libcpp.a $(srcdir)/autom4te.cache
 
 distclean: clean
 	-rm -f config.h stamp-h1 config.status config.cache config.log \
-	  configure.lineno configure.status.lineno Makefile
+	  configure.lineno configure.status.lineno Makefile localedir.h \
+	  localedir.hs
 
 maintainer-clean: distclean
 	@echo "This command is intended for maintainers to use"
@@ -178,7 +189,7 @@ update-po: $(CATALOGS:.gmo=.pox)
 # Implicit rules and I18N
 
 .c.o:
-	$(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) -c $<
+	$(CC) $(DEFS) $(INCLUDES) $(CPPFLAGS) $(ALL_CFLAGS) -c $<
 
 # N.B. We do not attempt to copy these into $(srcdir).
 .po.gmo:
@@ -230,9 +241,8 @@ expr.o: $(srcdir)/expr.c $(COMMON_DEPS)
 
 files.o: $(srcdir)/files.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h \
    $(top_incdir)/hashtab.h $(top_incdir)/md5.h
-  
 identifiers.o: $(srcdir)/identifiers.c $(COMMON_DEPS)
-init.o: $(srcdir)/init.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h
+init.o: $(srcdir)/init.c $(COMMON_DEPS) $(libcpp_incdir)/mkdeps.h localedir.h
 lex.o: $(srcdir)/lex.c $(COMMON_DEPS)
 line-map.o: $(srcdir)/line-map.c $(COMMON_DEPS)
 macro.o: $(srcdir)/macro.c $(COMMON_DEPS)
diff --git a/libcpp/aclocal.m4 b/libcpp/aclocal.m4
index 50eb82f77f5..3640760e76a 100644
--- a/libcpp/aclocal.m4
+++ b/libcpp/aclocal.m4
@@ -18,3 +18,4 @@ m4_include([../config/iconv.m4])
 m4_include([../config/lib-ld.m4])
 m4_include([../config/lib-link.m4])
 m4_include([../config/lib-prefix.m4])
+m4_include([../config/warnings.m4])
diff --git a/libcpp/configure b/libcpp/configure
index c23f2f9a2c3..7a1bc914a5e 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -311,7 +311,7 @@ ac_includes_default="\
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os SET_MAKE INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT RANLIB ac_ct_RANLIB ACLOCAL AUTOCONF AUTOHEADER CPP EGREP LIBOBJS ALLOCA USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS LIBICONV LTLIBICONV PACKAGE USED_CATALOGS MAINT LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os SET_MAKE INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT RANLIB ac_ct_RANLIB ACLOCAL AUTOCONF AUTOHEADER WARN_CFLAGS WARN_PEDANTIC WERROR CPP EGREP LIBOBJS ALLOCA USE_NLS LIBINTL LIBINTL_DEP INCINTL XGETTEXT GMSGFMT POSUB CATALOGS LIBICONV LTLIBICONV PACKAGE USED_CATALOGS MAINT LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -849,6 +849,7 @@ if test -n "$ac_init_help"; then
 Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
+  --enable-werror-always  enable -Werror despite compiler version
   --disable-rpath         do not hardcode runtime library paths
   --enable-maintainer-mode enable rules only needed by maintainers
   --enable-checking      enable expensive run-time checks
@@ -1437,6 +1438,8 @@ test -n "$target_alias" &&
   test "$program_prefix$program_suffix$program_transform_name" = \
     NONENONEs,x,x, &&
   program_prefix=${target_alias}-
+
+# Checks for programs.
 echo "$as_me:$LINENO: checking whether ${MAKE-make} sets \$(MAKE)" >&5
 echo $ECHO_N "checking whether ${MAKE-make} sets \$(MAKE)... $ECHO_C" >&6
 set dummy ${MAKE-make}; ac_make=`echo "$2" | sed 'y,:./+-,___p_,'`
@@ -1545,8 +1548,6 @@ test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL}'
 
 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
 
-
-# Checks for programs.
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -2683,8 +2684,158 @@ done
 test -n "$AUTOHEADER" || AUTOHEADER="$MISSING autoheader"
 
 
-# Checks for header files.
+# Figure out what compiler warnings we can enable.
+# See config/warnings.m4 for details.
+
+
+WARN_CFLAGS=
+save_CFLAGS="$CFLAGS"
+for option in -W -Wall -Wwrite-strings -Wstrict-prototypes \
+			  -Wmissing-prototypes -Wold-style-definition; do
+  as_acx_Woption=`echo "acx_cv_prog_cc_warning_$option" | $as_tr_sh`
+
+  echo "$as_me:$LINENO: checking whether $CC supports $option" >&5
+echo $ECHO_N "checking whether $CC supports $option... $ECHO_C" >&6
+if eval "test \"\${$as_acx_Woption+set}\" = set"; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  CFLAGS="$option"
+    cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  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_c_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_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  eval "$as_acx_Woption=yes"
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+eval "$as_acx_Woption=no"
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+
+fi
+echo "$as_me:$LINENO: result: `eval echo '${'$as_acx_Woption'}'`" >&5
+echo "${ECHO_T}`eval echo '${'$as_acx_Woption'}'`" >&6
+  if test `eval echo '${'$as_acx_Woption'}'` = yes; then
+  WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"
+fi
+
+  done
+CFLAGS="$save_CFLAGS"
 
+WARN_PEDANTIC=
+echo "$as_me:$LINENO: checking whether $CC supports -pedantic -Wno-long-long" >&5
+echo $ECHO_N "checking whether $CC supports -pedantic -Wno-long-long... $ECHO_C" >&6
+if test "${acx_cv_prog_cc_pedantic__Wno_long_long+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  save_CFLAGS="$CFLAGS"
+CFLAGS="-pedantic -Wno-long-long"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  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_c_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_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  acx_cv_prog_cc_pedantic__Wno_long_long=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+acx_cv_prog_cc_pedantic__Wno_long_long=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+CFLAGS="$save_CFLAGS"
+fi
+echo "$as_me:$LINENO: result: $acx_cv_prog_cc_pedantic__Wno_long_long" >&5
+echo "${ECHO_T}$acx_cv_prog_cc_pedantic__Wno_long_long" >&6
+if test $acx_cv_prog_cc_pedantic__Wno_long_long = yes; then
+  WARN_PEDANTIC="-pedantic -Wno-long-long"
+fi
+
+
+
+# Only enable with --enable-werror-always until existing warnings are
+# corrected.
+WERROR=
+# Check whether --enable-werror-always or --disable-werror-always was given.
+if test "${enable_werror_always+set}" = set; then
+  enableval="$enable_werror_always"
+
+else
+  enable_werror_always=no
+fi;
+if test $enable_werror_always = yes; then
+  WERROR=-Werror
+fi
+
+
+
+# Checks for header files.
 echo "$as_me:$LINENO: checking whether time.h and sys/time.h may both be included" >&5
 echo $ECHO_N "checking whether time.h and sys/time.h may both be included... $ECHO_C" >&6
 if test "${ac_cv_header_time+set}" = set; then
@@ -7564,6 +7715,9 @@ s,@ac_ct_RANLIB@,$ac_ct_RANLIB,;t t
 s,@ACLOCAL@,$ACLOCAL,;t t
 s,@AUTOCONF@,$AUTOCONF,;t t
 s,@AUTOHEADER@,$AUTOHEADER,;t t
+s,@WARN_CFLAGS@,$WARN_CFLAGS,;t t
+s,@WARN_PEDANTIC@,$WARN_PEDANTIC,;t t
+s,@WERROR@,$WERROR,;t t
 s,@CPP@,$CPP,;t t
 s,@EGREP@,$EGREP,;t t
 s,@LIBOBJS@,$LIBOBJS,;t t
diff --git a/libcpp/configure.ac b/libcpp/configure.ac
index 60d00392199..0bcf1711b03 100644
--- a/libcpp/configure.ac
+++ b/libcpp/configure.ac
@@ -6,10 +6,10 @@ AC_INIT(cpplib, [ ], gcc-bugs@gcc.gnu.org, cpplib)
 AC_CONFIG_SRCDIR(ucnid.h)
 AC_CONFIG_MACRO_DIR(../config)
 AC_CANONICAL_SYSTEM
-AC_PROG_MAKE_SET
-AC_PROG_INSTALL
 
 # Checks for programs.
+AC_PROG_MAKE_SET
+AC_PROG_INSTALL
 AC_PROG_CC
 AC_PROG_RANLIB
 
@@ -18,6 +18,17 @@ AC_CHECK_PROGS([ACLOCAL], [aclocal], [$MISSING aclocal])
 AC_CHECK_PROGS([AUTOCONF], [autoconf], [$MISSING autoconf])
 AC_CHECK_PROGS([AUTOHEADER], [autoheader], [$MISSING autoheader])
 
+# Figure out what compiler warnings we can enable.
+# See config/warnings.m4 for details.
+
+ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
+			  -Wmissing-prototypes -Wold-style-definition])
+ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long])
+
+# Only enable with --enable-werror-always until existing warnings are
+# corrected.
+ACX_PROG_CC_WARNINGS_ARE_ERRORS([manual])
+
 # Checks for header files.
 AC_HEADER_TIME
 ACX_HEADER_STRING
diff --git a/libcpp/init.c b/libcpp/init.c
index aaf1d6b353c..b2be19a7136 100644
--- a/libcpp/init.c
+++ b/libcpp/init.c
@@ -24,6 +24,7 @@ Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #include "cpplib.h"
 #include "internal.h"
 #include "mkdeps.h"
+#include "localedir.h"
 
 static void init_library (void);
 static void mark_named_operators (cpp_reader *);