Link backtrace.cpp on Android too for consistency. Use it in FLOG.

Android.mk

@@ -10,6 +10,7 @@ LOCAL_SRC_FILES :=\
     android/native_audio.cpp \
     audio/wav_read.cpp \
     audio/mixer.cpp.arm \
+    base/backtrace.cpp \
     base/buffer.cpp \
     base/display.cpp \
     base/timeutil.cpp \

base/PCMain.cpp

@@ -400,6 +400,8 @@ int main(int argc, char *argv[]) {
 	SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, 1);
 
 	int mode;
+	float set_dpi = 1.0f;
+	float set_scale = 1.0f;
 #ifdef USING_GLES2
 	mode = SDL_SWSURFACE | SDL_FULLSCREEN;
 	int set_xres = -1;
@@ -409,7 +411,6 @@ int main(int argc, char *argv[]) {
 	int set_xres = -1;
 	int set_yres = -1;
 
-	float set_dpi = 1.0f;
 	for (int i = 1; i < argc; i++) {
 		if (!strcmp(argv[i],"--fullscreen"))
 			mode |= SDL_FULLSCREEN;
@@ -420,6 +421,8 @@ int main(int argc, char *argv[]) {
 		}
 		if (set_dpi == -2)
 			set_dpi = parseFloat(argv[i]);
+		if (set_scale == -2)
+			set_scale = parseFloat(argv[i]);
 
 		if (!strcmp(argv[i],"--xres"))
 			set_xres = -2;
@@ -427,6 +430,8 @@ int main(int argc, char *argv[]) {
 			set_yres = -2;
 		if (!strcmp(argv[i],"--dpi"))
 			set_dpi = -2;
+		if (!strcmp(argv[i],"--scale"))
+			set_scale = -2;
 	}
 #endif
 	if (mode & SDL_FULLSCREEN) {
@@ -438,13 +443,15 @@ int main(int argc, char *argv[]) {
 #endif
 	} else {
 		// set a sensible default resolution (2x)
-		pixel_xres = 480 * 2;
-		pixel_yres = 272 * 2;
+		pixel_xres = 480 * 2 * set_scale;
+		pixel_yres = 272 * 2 * set_scale;
 #ifdef PPSSPP
 		g_Config.bFullScreen = false;
 #endif
 	}
 
+	set_dpi = 1.0f / set_dpi;
+
 	if (!landscape) {
 		std::swap(pixel_xres, pixel_yres);
 	}

base/backtrace.cpp

@@ -1,8 +1,7 @@
 #include "base/backtrace.h"
 
-#ifdef __linux__
-
-// LINUX ONLY
+// The mac check doesn't seem to work right.
+#if (!defined(ANDROID) && defined(__linux__)) || (defined(__APPLE__) && (defined(_M_IX86) || defined(_M_X64)))
 
 #include <execinfo.h>
 #include <unistd.h>
@@ -14,4 +13,12 @@ void PrintBacktraceToStderr() {
 	backtrace_symbols_fd(backtrace_buffer, num_addrs, STDERR_FILENO);
 }
 
+#else
+
+#include <stdio.h>
+
+void PrintBacktraceToStderr() {
+	fprintf(stderr, "No backtrace available to print on this platform\n");
+}
+
 #endif

base/logging.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include "backtrace.h"
+
 // Simple wrapper around Android's logging interface that also allows other
 // implementations, and also some misc utilities.
 
@@ -29,12 +31,14 @@ inline void Crash() { __asm { int 3 }; }
 
 #if defined(ARM) || defined(MIPS)
 inline void Crash() {
+	PrintBacktraceToStderr();
 	char *p = (char *)1337;
 	*p = 1;
 }
 #else
 // TODO: 64-bit version
 inline void Crash() {
+	PrintBacktraceToStderr();
 	asm("int $0x3");
 }
 #endif