opt-functions.awk (opt_args): Allow argument to be enclosed in curly braces.

	* opt-functions.awk (opt_args): Allow argument to be enclosed in
	curly braces.
	* doc/options.texi (Option properties):  Mention new quoting syntax.

From-SVN: r150248

gcc/ChangeLog

+2009-07-30  Dave Korn  <dave.korn.cygwin@gmail.com>
+
+	* opt-functions.awk (opt_args): Allow argument to be enclosed in
+	curly braces.
+	* doc/options.texi (Option properties):  Mention new quoting syntax.
+
 2009-07-29  Douglas B Rupp  <rupp@gnat.com>
 
 	* config/alpha/alpha.c (alpha_start_function):

gcc/doc/options.texi

@@ -84,7 +84,16 @@ configurations and yet the masks always need to be defined.
 @node Option properties
 @section Option properties
 
-The second field of an option record can specify the following properties:
+The second field of an option record can specify any of the following
+properties.  When an option takes an argument, it is enlosed in parentheses
+following the option property name.  The parser that handles option files
+is quite simplistic, and will be tricked by any nested parentheses within
+the argument text itself; in this case, the entire option argument can
+be wrapped in curly braces within the parentheses to demarcate it, e.g.:
+
+@smallexample
+Condition(@{defined (USE_CYGWIN_LIBSTDCXX_WRAPPERS)@})
+@end smallexample
 
 @table @code
 @item Common

gcc/opt-functions.awk

@@ -41,7 +41,13 @@ function opt_args(name, flags)
 	if (flags !~ " " name "\\(")
 		return ""
 	sub(".* " name "\\(", "", flags)
-	sub("\\).*", "", flags)
+	if (flags ~ "^{")
+	{
+		sub ("^{", "", flags)
+		sub("}\\).*", "", flags)
+	}
+	else
+		sub("\\).*", "", flags)
 
 	return flags
 }