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Close stdout in error

Printing ???? is a non sense because the backend must check
for this sequence, and it means a low level read routine is needed,
but a better approach can be close the output stream.

--- a/cc1/error.c

+++ b/cc1/error.c

@@ -26,7 +26,7 @@

 	if (flag < 0) {

 		if (!failure) {

 			failure = 1;

-			puts("????");

+			fclose(stdout);

 		}

 		failure = 1;

 		if (nerrors++ == MAXERRNUM) {

--- a/cc1/ir.md

+++ b/cc1/ir.md

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

 and fields in statements are separated by tabulators. Declaration

 statements begin in column 0, meanwhile expressions and control

 flow begin with a tabulator. When the front end detects an error

-it emits ???? and stop of emitting anything else.

+it closes the output stream.

 ## Types ##