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Emit warnings only when the flag is not zero

This change avoid the warning while we are developping.
Maybe could be a good idea later to remove it.

--- a/cc.h

+++ b/cc.h

@@ -20,7 +20,7 @@

 extern void error(const char *fmt, ...);

 extern void die(const char *fmt, ...);

-extern void warn(char flag, const char *fmt, ...);

+extern void warn(signed char flag, const char *fmt, ...);

 extern void *xmalloc(size_t size);

 extern void *xcalloc(size_t nmemb, size_t size);

 extern char *xstrdup(const char *s);

--- a/error.c

+++ b/error.c

@@ -11,18 +11,20 @@

 extern const char *filename;

 static void

-warn_helper(char flag, const char *fmt, va_list va)

+warn_helper(signed char flag, const char *fmt, va_list va)

 {

+	if (!flag)

+		return;

 	fprintf(stderr, "%s:%s:%u:%u: ",

 		(!flag) ? "warning" : "error", filename, linenum, columnum);

 	vfprintf(stderr, fmt, va);

 	putc('\n', stderr);

-	if (flag)

+	if (flag < 0)

 		exit(EXIT_FAILURE); /* TODO: uhmmmm */

 }

 void

-warn(char flag, const char *fmt, ...)

+warn(signed char flag, const char *fmt, ...)

 {

 	va_list va;

 	va_start(va, fmt);

-- 

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