From: Xiangzhe <xiangzhedev@gmail.com>
Subject: [PATCH] build: make libunwind detection authoritative

UniversalStacktrace probes for libunwind headers independently of CMake.  If
CMake has deliberately disabled or failed to find libunwind, this compiles
calls to libunwind without linking it.  Pass the CMake result to the header so
libunwind can be controlled without automagic linkage.

--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -391,6 +391,9 @@
 
 IF(Unwind_FOUND)
   list(INSERT CORE_LIBRARIES 0 unwind::unwind)
+  add_compile_definitions(USE_UNWIND=1)
+ELSE()
+  add_compile_definitions(USE_UNWIND=0)
 ENDIF()
 
 IF(USE_SENTRY)
--- a/external_imported/UniversalStacktrace/ust/ust_unix.hpp
+++ b/external_imported/UniversalStacktrace/ust/ust_unix.hpp
@@ -15,6 +15,13 @@
 #if defined(__ANDROID__)
 // Android's bionic libc does not provide execinfo or libunwind
 #define USE_UNWIND 0
+#elif defined(USE_UNWIND)
+#if USE_UNWIND
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#else
+#include <execinfo.h>
+#endif
 #elif __has_include(<libunwind.h>)
 #define USE_UNWIND (1)
 #define UNW_LOCAL_ONLY