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cc: wait for cpp to report whether it was a success

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

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

@@ -180,7 +180,7 @@

 compile(char *file, char **defs, int ndef)

 {

 	char *ofile, *p, **av;

-	int i, c, fd[2];

+	int i, c, fd[2], status;

 	static int first = 1;

 	ofile = strdup(file);

@@ -300,6 +300,8 @@

 	yyparse();

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

 		gclean();

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

+		nerrors++;

 	return nerrors;

 }