linux: add simple crash handler that dumps stacktrace

Since the Linux version seems much more unstable than the Windows one,
having more information where the crash occured will help with figuring
out where the problems are.

This commit adds a simple crash handler that dumps out the stacktrace,
it's only supported on Linux.

Editor/CMakeLists.txt

@@ -26,6 +26,12 @@ else ()
 	)
 	set(LIB_DXCOMPILER "libdxcompiler.so")
 
+	# needed for proper names in crash stacktrace
+	set_target_properties(WickedEngineEditor
+		PROPERTIES
+		ENABLE_EXPORTS ON
+	)
+
 endif ()
 
 # Copy content to build folder:

Editor/main_SDL2.cpp

@@ -6,6 +6,11 @@
 
 #include "icon.c"
 
+#ifdef __linux__
+#  include <execinfo.h>
+#  include <signal.h>
+#endif
+
 using namespace std;
 
 Editor editor;
@@ -92,8 +97,35 @@ void set_window_icon(SDL_Window *window) {
     SDL_FreeSurface(icon);
 }
 
+#ifdef __linux__
+
+void crash_handler(int sig)
+{
+	void* buf[100];
+
+	size_t size = backtrace(buf, 100);
+	fprintf(stderr,
+			"\e[31m" // red
+			"The editor just crashed, sorry about that! If you make a bug report, please include the following information:\n\n"
+			"Signal: %i (%s)\n"
+			"Version: %s\nStacktrace:\n", sig, sigdescr_np(sig), wi::version::GetVersionString());
+	backtrace_symbols_fd(buf, size, STDERR_FILENO);
+	fprintf(stderr, "\e[m"); // back to normal
+	exit(1);
+}
+
+#endif
+
 int main(int argc, char *argv[])
 {
+
+#ifdef __linux__
+	for (int sig : std::array{SIGABRT, SIGBUS, SIGILL, SIGFPE, SIGSEGV})
+	{
+		signal(sig, crash_handler);
+	}
+#endif
+
     wi::arguments::Parse(argc, argv);
 
     sdl2::sdlsystem_ptr_t system = sdl2::make_sdlsystem(SDL_INIT_EVERYTHING | SDL_INIT_EVENTS);
@@ -121,7 +153,6 @@ int main(int argc, char *argv[])
 
 	width = std::max(100, width);
 	height = std::max(100, height);
-
     sdl2::window_ptr_t window = sdl2::make_window(
             "Wicked Editor",
             SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,