From 82a92743fcbaf1f88b05f31ab8d2f7093157aad1 Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Tue, 9 Mar 2021 10:08:05 +0100
Subject: [PATCH] BUILD: bug: refine HA_LINK_ERROR() to only be used on gcc and
 derivatives

TCC happens to define __OPTIMIZE__ at -O2 but doesn't proceed with dead
code elimination, resulting in ha_free() to always reference the link
error symbol. Let's condition this test on __GCC__ which others like
Clang also define.
---
 include/haproxy/bug.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index 57b7fc061..f5509c8f2 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -74,7 +74,7 @@
 #endif
 
 /* When not optimizing, clang won't remove that code, so only compile it in when optimizing */
-#ifdef __OPTIMIZE__
+#if defined(__GNUC__) && defined(__OPTIMIZE__)
 #define HA_LINK_ERROR(what)                                                  \
 	do {                                                                 \
 		/* provoke a build-time error */                             \