From 5677de586fbe3ffff0c0a3bb53ea6ea915a5d70f Mon Sep 17 00:00:00 2001
From: Randy Palamar <randy@rnpnr.xyz>
Date: Wed, 29 Nov 2023 05:21:10 -0700
Subject: [PATCH] os/osinit: fix build when execinfo.h is missing

HAVE_BACKTRACE gets set on systems with libunwind however
execinfo.h may be missing (on *BSD or musl for example).
HAVE_EXECINFO_H has been defined by the build system for a long
time but previously not used.

Signed-off-by: Randy Palamar <randy@rnpnr.xyz>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1207>
---
 os/osinit.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/os/osinit.c b/os/osinit.c
index 71c943a38..3e18b51b0 100644
--- a/os/osinit.c
+++ b/os/osinit.c
@@ -54,7 +54,7 @@ SOFTWARE.
 #ifdef HAVE_DLFCN_H
 #include <dlfcn.h>
 #endif
-#ifdef HAVE_BACKTRACE
+#if defined(HAVE_BACKTRACE) && defined(HAVE_EXECINFO_H)
 #include <execinfo.h>
 #endif
 
@@ -202,7 +202,7 @@ OsInit(void)
         if (!server_poll)
             FatalError("failed to allocate poll structure");
 
-#ifdef HAVE_BACKTRACE
+#if defined(HAVE_BACKTRACE) && defined(HAVE_EXECINFO_H)
         /*
          * initialize the backtracer, since the ctor calls dlopen(), which
          * calls malloc(), which isn't signal-safe.