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Disable macro expansions in cpp clausules

It is mandatory by the standard, and it is needed
beause in other case you can have recursion problems

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -532,6 +532,8 @@

 	if (*input->p != '#')

 		return 0;

 	++input->p;

+

+	disexpand = 1;

 	lexmode = CPPMODE;

 	setnamespace(NS_CPPCLAUSES);

 	next();

@@ -544,6 +546,8 @@

 	if (yytoken != EOFTOK && !cppoff)

 		error("trailing characters after preprocessor directive");

+	disexpand = 0;

 	lexmode = CCMODE;

+

 	return 1;

 }