Fixed Windows/MSVC compilation.

source/mijin/debug/stacktrace.cpp

@@ -3,9 +3,19 @@
 
 #include <optional>
 #include <string>
-#include <backtrace.h>
 #include "../detect.hpp"
 
+#if MIJIN_COMPILER == MIJIN_COMPILER_CLANG || MIJIN_COMPILER == MIJIN_COMPILER_GCC
+#define MIJIN_USE_LIBBACKTRACE 1
+#else
+#define MIJIN_USE_LIBBACKTRACE 0
+#endif
+
+#if MIJIN_USE_LIBBACKTRACE
+#include <backtrace.h>
+#endif
+
+
 namespace mijin
 {
 namespace
@@ -38,6 +48,7 @@ thread_local Optional<Stacktrace> gCurrentExceptionStackTrace;
 // internal functions
 //
 
+#if MIJIN_USE_LIBBACKTRACE
 int backtraceFullCallback(void* data, std::uintptr_t programCounter, const char* filename, int lineno, const char* function)
 {
     BacktraceData& btData = *static_cast<BacktraceData*>(data);
@@ -57,6 +68,7 @@ void backtraceErrorCallback(void* data, const char* msg, int /* errnum */)
 }
 
 thread_local backtrace_state* gBacktraceState = nullptr;
+#endif // MIJIN_USE_LIBBACKTRACE
 } // namespace
 
 //
@@ -65,6 +77,7 @@ thread_local backtrace_state* gBacktraceState = nullptr;
 
 Result<Stacktrace> captureStacktrace(unsigned skipFrames) noexcept
 {
+#if MIJIN_USE_LIBBACKTRACE
     BacktraceData btData;
     if (gBacktraceState == nullptr)
     {
@@ -85,6 +98,10 @@ Result<Stacktrace> captureStacktrace(unsigned skipFrames) noexcept
     }
 
     return Stacktrace(std::move(btData.stackframes));
+#else // MIJIN_USE_LIBBACKTRACE
+	(void) skipFrames;
+	return {}; // TODO
+#endif // MIJIN_USE_LIBBACKTRACE
 }
 
 const Optional<Stacktrace>& getExceptionStacktrace() noexcept