From d65a926a67749f8e8ffb6df9b3e2e123669b0656 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Wed, 14 Aug 2019 11:49:20 +0200
Subject: Filter: Don't alloc varargs array if its length would be zero

---
 filter/decl.m4 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/filter/decl.m4 b/filter/decl.m4
index efecb9a5..14b9329c 100644
--- a/filter/decl.m4
+++ b/filter/decl.m4
@@ -138,7 +138,7 @@ FID_IFCONST([[
 }
 FID_IFCONST([[
   const struct f_inst **items = NULL;
-  if (constargs) {
+  if (constargs && whati->varcount) {
     items = alloca(whati->varcount * sizeof(struct f_inst *));
     const struct f_inst *child = fvar;
     for (uint i=0; child; i++)
-- 
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