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Add limit to the number of errors

This limit helps in the case of inifinite errors, and after 10
errors nobody read more.

--- a/cc1/error.c

+++ b/cc1/error.c

@@ -7,7 +7,10 @@

 #include "../inc/cc.h"

 #include "cc1.h"

+#define MAXERRNUM 10

+

 extern uint8_t failure;

+static uint8_t nerrors;

 static void

 warn_helper(int8_t flag, char *fmt, va_list va)

@@ -18,6 +21,10 @@

 		(flag < 0) ? "error" : "warning", filename(), fileline());

 	vfprintf(stderr, fmt, va);

 	putc('\n', stderr);

+	if (flag < 0 && nerrors++ == MAXERRNUM) {

+		fputs("too many errors\n", stderr);

+		exit(-1);

+	}

 }

 void