autoupdate

[gnulib.git] / m4 / warnings.m4

diff --git a/m4/warnings.m4 b/m4/warnings.m4
index 594ff97..a4a750a 100644 (file)
--- a/m4/warnings.m4
+++ b/m4/warnings.m4
@@ -1,34 +1,37 @@
-# warnings.m4 serial 1
-dnl Copyright (C) 2008 Free Software Foundation, Inc.
+# warnings.m4 serial 5
+dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
 dnl From Simon Josefsson
 
-# gl_WARN_INIT
-# Initializes WARN_CFLAGS variable.
-AC_DEFUN([gl_WARN_INIT],
-[
-  AC_ARG_VAR(WARN_CFLAGS, [C compiler warning flags])
-])
+# gl_AS_VAR_APPEND(VAR, VALUE)
+# ----------------------------
+# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
+m4_ifdef([AS_VAR_APPEND],
+[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
+[m4_define([gl_AS_VAR_APPEND],
+[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
 
-# gl_WARN_ADD([parameter]) adds parameter to WARN_CFLAGS if compiler
-# supports it.  For example, use gl_WARN_ADD([-Werror]).
+# gl_WARN_ADD(PARAMETER, [VARIABLE = WARN_CFLAGS])
+# ------------------------------------------------
+# Adds parameter to WARN_CFLAGS if the compiler supports it.  For example,
+# gl_WARN_ADD([-Wparentheses]).
 AC_DEFUN([gl_WARN_ADD],
-[
-  pushdef([param],[translit([$1],[ABCDEFGHIJKLMNOPQRSTUVWXYZ./-],
-                                 [abcdefghijklmnopqrstuvwxyz___])])
-
-  AC_CACHE_CHECK([whether compiler handles $1], [gl_cv_warn[]param[]], [
-    save_CFLAGS="$CFLAGS"
-    CFLAGS="${CFLAGS} $1"
-    AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
-                       gl_cv_warn[]param=yes, gl_cv_warn[]param=no)
-    CFLAGS="$save_CFLAGS"
-  ])
-
-  if test $gl_cv_warn[]param = "yes"; then
-    WARN_CFLAGS="$WARN_CFLAGS $1"
-  fi
+dnl FIXME: gl_Warn must be used unquoted until we can assume
+dnl autoconf 2.64 or newer.
+[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_$1])dnl
+AC_CACHE_CHECK([whether compiler handles $1], m4_defn([gl_Warn]), [
+  gl_save_CPPFLAGS="$CPPFLAGS"
+  CPPFLAGS="${CPPFLAGS} $1"
+  AC_PREPROC_IFELSE([AC_LANG_PROGRAM([])],
+                    [AS_VAR_SET(gl_Warn, [yes])],
+                    [AS_VAR_SET(gl_Warn, [no])])
+  CPPFLAGS="$gl_save_CPPFLAGS"
+])
+AS_VAR_IF(gl_Warn, [yes],
+  [gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])])
+AS_VAR_POPDEF([gl_Warn])dnl
+m4_ifval([$2], [AS_LITERAL_IF([$2], [AC_SUBST([$2])], [])])dnl
 ])