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cc: do not wait for cpp to finish if there were errors

--- a/sys/src/cmd/cc/lex.c

+++ b/sys/src/cmd/cc/lex.c

@@ -300,7 +300,7 @@

 	yyparse();

 	if(!debug['a'] && !debug['Z'])

 		gclean();

-	if(mywait(&status) > 0 && status != 0)

+	if(nerrors == 0 && mywait(&status) > 0 && status != 0)

 		nerrors++;

 	return nerrors;

 }

-- 

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