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

	* config/warnings.m4: Add second parameter with name of variable.
	Always append to the variable if it exists.

1 files changed, 15 insertions, 11 deletions

diff --git a/config/warnings.m4 b/config/warnings.m4
index 8b832382b..af99ffec0 100644
--- a/config/warnings.m4
+++ b/config/warnings.m4
@@ -1,6 +1,6 @@
 # Autoconf include file defining macros related to compile-time warnings.
 
-# Copyright 2004, 2005 Free Software Foundation, Inc.
+# Copyright 2004, 2005, 2007 Free Software Foundation, Inc.
 
 #This file is part of GCC.
 
@@ -19,13 +19,14 @@
 #Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 #02110-1301, USA.
 
-# ACX_PROG_CC_WARNING_OPTS([-Wfoo -Wbar -Wbaz])
-#   Sets @WARN_CFLAGS@ to the subset of the given options which the
+# 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
-AC_SUBST([WARN_CFLAGS])dnl
-WARN_CFLAGS=
+m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
+AC_SUBST(acx_Var)dnl
+acx_Var=
 save_CFLAGS="$CFLAGS"
 for option in $1; do
   AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
@@ -36,20 +37,22 @@ for option in $1; do
       [AS_VAR_SET(acx_Woption, no)])
   ])
   AS_IF([test AS_VAR_GET(acx_Woption) = yes],
-        [WARN_CFLAGS="$WARN_CFLAGS${WARN_CFLAGS:+ }$option"])
+        [acx_Var="$acx_Var${acx_Var:+ }$option"])
   AS_VAR_POPDEF([acx_Woption])dnl
 done
 CFLAGS="$save_CFLAGS"
+m4_popdef([acx_Var])dnl
 ])# ACX_PROG_CC_WARNING_OPTS
 
-# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC([-Wno-long-long ...])
-#   Sets WARN_PEDANTIC to "-pedantic" + the argument, if the compiler is GCC
+# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC)
+#   Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC
 #   and 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
+m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
+AC_SUBST(acx_Var)dnl
 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl
-WARN_PEDANTIC=
+acx_Var=
 AS_IF([test "$GCC" = yes],
 [AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,
 [save_CFLAGS="$CFLAGS"
@@ -59,9 +62,10 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
    [AS_VAR_SET(acx_Pedantic, no)])
 CFLAGS="$save_CFLAGS"])
 AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
-      [WARN_PEDANTIC="-pedantic $1"])
+      [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"])
 ])
 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])