warnings.m4: Use m4_expand_once to clear the AC_SUBST'ed variable.

config:
2007-01-11  Paolo Bonzini  <bonzini@gnu.org>

        * warnings.m4: Use m4_expand_once to clear the AC_SUBST'ed variable.
        (ACX_PROG_CC_WARNINGS_ARE_ERRORS): Fix typo.  Add optional 2nd argument.

libcpp:
2007-01-11  Paolo Bonzini  <bonzini@gnu.org>

	* configure: Regenerate.

From-SVN: r120675

4 files changed, 28 insertions, 13 deletions

diff --git a/config/ChangeLog b/config/ChangeLog
index 8b0aa1d429f..225e57629ba 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,6 +1,11 @@
 2007-01-11  Paolo Bonzini  <bonzini@gnu.org>
 
-	* config/warnings.m4: Add second parameter with name of variable.
+        * warnings.m4: Use m4_expand_once to clear the AC_SUBST'ed variable.
+        (ACX_PROG_CC_WARNINGS_ARE_ERRORS): Fix typo.  Add optional 2nd argument.
+
+2007-01-11  Paolo Bonzini  <bonzini@gnu.org>
+
+	* warnings.m4: Add second parameter with name of variable.
 	Always append to the variable if it exists.
 
 2007-01-01  Mike Stump  <mrs@apple.com>
diff --git a/config/warnings.m4 b/config/warnings.m4
index af99ffec083..d3358b6a894 100644
--- a/config/warnings.m4
+++ b/config/warnings.m4
@@ -19,14 +19,15 @@
 #Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 #02110-1301, USA.
 
-# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS@)
+# ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS)
 #   Sets @VARIABLE@ to the subset of the given options which the
 #   compiler accepts.
 AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
 [AC_REQUIRE([AC_PROG_CC])dnl
 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
 AC_SUBST(acx_Var)dnl
-acx_Var=
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
 save_CFLAGS="$CFLAGS"
 for option in $1; do
   AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
@@ -51,8 +52,9 @@ AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
 [AC_REQUIRE([AC_PROG_CC])dnl
 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
 AC_SUBST(acx_Var)dnl
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl
-acx_Var=
 AS_IF([test "$GCC" = yes],
 [AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,
 [save_CFLAGS="$CFLAGS"
@@ -68,23 +70,25 @@ AS_VAR_POPDEF([acx_Pedantic])dnl
 m4_popdef([acx_Var])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
+# ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
+#   sets @VARIABLE@ 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
+#   then @VARIABLE@ 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=
+m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
+AC_SUBST(acx_Var)dnl
+m4_expand_once([acx_Var=
+],m4_quote(acx_Var=))dnl
 AC_ARG_ENABLE(werror-always, 
     AS_HELP_STRING([--enable-werror-always],
 		   [enable -Werror despite compiler version]),
 [], [enable_werror_always=no])
 AS_IF([test $enable_werror_always = yes],
-      [WERROR=-Werror],
+      [acx_Var="$acx_Var${acx_Var:+ }-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,
@@ -98,6 +102,7 @@ AS_IF([test $enable_werror_always = yes],
    [AS_VAR_SET(acx_GCCvers, yes)],
    [AS_VAR_SET(acx_GCCvers, no)])])
  AS_IF([test AS_VAR_GET(acx_GCCvers) = yes],
-       [WERROR=-WerrorB])
-  AS_VAR_POPDEF([acx_GCCvers])]))
+       [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
+  AS_VAR_POPDEF([acx_GCCvers])])
+m4_popdef([acx_Var])dnl
 ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index 11a165f853a..ab548bb2b02 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -2,6 +2,10 @@
 
 	* configure: Regenerate.
 
+2007-01-11  Paolo Bonzini  <bonzini@gnu.org>
+
+	* configure: Regenerate.
+
 2007-01-04  Tom Tromey  <tromey@redhat.com>
 
 	PR preprocessor/28165:
diff --git a/libcpp/configure b/libcpp/configure
index 26ed11015ba..45c97247f53 100755
--- a/libcpp/configure
+++ b/libcpp/configure
@@ -2835,11 +2835,12 @@ else
   enable_werror_always=no
 fi;
 if test $enable_werror_always = yes; then
-  WERROR=-Werror
+  WERROR="$WERROR${WERROR:+ }-Werror"
 fi
 
 
 
+
 # Dependency checking.
 rm -rf .tst 2>/dev/null
 mkdir .tst 2>/dev/null