From d8cb29f6e0cb6ec08d40b2aefe6e83e064ced707 Mon Sep 17 00:00:00 2001
From: Martin Whitaker <icarus@martin-whitaker.me.uk>
Date: Sun, 14 Mar 2021 10:03:08 +0000
Subject: [PATCH] Fix bug in preprocessor line directive handling.

---
 ivlpp/lexor.lex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ivlpp/lexor.lex b/ivlpp/lexor.lex
index 5160f2e38..404ebe941 100644
--- a/ivlpp/lexor.lex
+++ b/ivlpp/lexor.lex
@@ -777,7 +777,7 @@ static void handle_line_directive(void)
          will underflow on line 1, but that's OK because we are using
          unsigned arithmetic. */
     assert(istack);
-    realloc(istack->path, fn_end-fn_start+1);
+    istack->path = realloc(istack->path, fn_end-fn_start+1);
     strncpy(istack->path, fn_start, fn_end-fn_start);
     istack->path[fn_end-fn_start] = '\0';
     istack->lineno = lineno - 2;