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[cc1] Remove -o option

It's not necessary, the user can use shell redirection if needed.

--- a/cc1/cc1.h

+++ b/cc1/cc1.h

@@ -478,7 +478,7 @@

 extern int onlycpp, onlyheader;

 extern unsigned curctx;

 extern Symbol *curfun, *zero, *one;

-extern char *infile, *outfile;

+extern char *infile;

 extern unsigned lineno;

 extern char filenam[FILENAME_MAX];

--- a/cc1/main.c

+++ b/cc1/main.c

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

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

 #include "cc1.h"

-char *argv0, *infile, *outfile;

+char *argv0, *infile;

 int warnings;

 jmp_buf recover;

@@ -22,13 +22,6 @@

 extern int failure;

 static void

-clean(void)

-{

-	if (failure && outfile)

-		remove(outfile);

-}

-

-static void

 defmacro(char *macro)

 {

 	char *p = strchr(macro, '=');

@@ -54,7 +47,6 @@

 	char *cp;

 	int i;

-	atexit(clean);

 	ilex();

 	icpp();

 	icode();

@@ -79,9 +71,6 @@

 	case 'd':

 		DBGON();

 		break;

-	case 'o':

-		outfile = EARGF(usage());

-		break;

 	case 'w':

 		warnings = 1;

 		break;

@@ -91,9 +80,6 @@

 	if (argc > 1)

 		usage();

-

-	if (outfile && !freopen(outfile, "w", stdout))

-		die("error opening output: %s", strerror(errno));

 	for (i = 0; i < uflags.n; ++i)

 		undefmacro(uflags.s[i]);