compositor: check for execinfo.h

Some systems may not have execinfo.h. Add a configure test for it, and
if it is not found, make the backtrace() call a no-operation.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>

configure.ac

@@ -24,6 +24,8 @@ AC_CHECK_FUNC([dlopen], [],
               AC_CHECK_LIB([dl], [dlopen], DLOPEN_LIBS="-ldl"))
 AC_SUBST(DLOPEN_LIBS)
 
+AC_CHECK_HEADERS([execinfo.h])
+
 PKG_CHECK_MODULES(COMPOSITOR,
 		  [wayland-server egl >= 7.10 glesv2 xkbcommon pixman-1])
 

shared/os-compatibility.h

@@ -23,6 +23,16 @@
 #ifndef OS_COMPATIBILITY_H
 #define OS_COMPATIBILITY_H
 
+#ifdef HAVE_EXECINFO_H
+#include <execinfo.h>
+#else
+static inline int
+backtrace(void **buffer, int size)
+{
+	return 0;
+}
+#endif
+
 int
 os_socketpair_cloexec(int domain, int type, int protocol, int *sv);
 

src/compositor.c

@@ -42,7 +42,6 @@
 #include <dlfcn.h>
 #include <signal.h>
 #include <setjmp.h>
-#include <execinfo.h>
 
 #include <wayland-server.h>
 #include "compositor.h"