From 6ea22d950fd7246c9159a3601819ae23d03e8dcd Mon Sep 17 00:00:00 2001
From: Nicholas Noll <nbnoll@eml.cc>
Date: Wed, 20 May 2020 12:22:30 -0700
Subject: fix: truncate infinite recursion caused by self referential macros

---
 sys/cmd/cc/lex.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'sys/cmd/cc/lex.c')

diff --git a/sys/cmd/cc/lex.c b/sys/cmd/cc/lex.c
index 8ce4e79..4cc1259 100644
--- a/sys/cmd/cc/lex.c
+++ b/sys/cmd/cc/lex.c
@@ -635,8 +635,8 @@ Dispatch:
         } 
 
         sym = lookup(&lx->sym, tok.val.s);
-        if (sym) {
-            io = makeio();
+        if (sym && ((uintptr)sym->name != (uintptr)lx->io->path)) {
+            io = makeio(sym->name);
             printf("EXPANDING MACRO %s\n", sym->name);
             io->buf.end   += expandmacro(lx, sym, io->b);
             *io->buf.end++ = EOF;
-- 
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