Upgrade to Qt 6 (#130)

Why? Open Source Qt 5 will stop receiving updates rather sooner than later so it's worth switching to Qt 6 to remain compatible with modern systems.

Reviewed-on: http://vub63vv26q6v27xzv2dtcd25xumubshogm67yrpaz2rculqxs7jlfqad.onion/torzu-emu/torzu/pulls/130

externals/CMakeLists.txt

@@ -50,10 +50,31 @@ if ((ARCHITECTURE_x86_64 OR ARCHITECTURE_arm64) AND NOT TARGET dynarmic::dynarmi
 endif()
 
 # getopt
-if (MSVC)
+include(CheckIncludeFile)
+check_include_file(getopt.h HAS_GETOPT)
+if (NOT HAS_GETOPT)
+    message(STATUS "Using bundled getopt")
     add_subdirectory(getopt)
 endif()
 
+# clang_rt_builtins
+check_c_source_compiles("
+#include <stdint.h>
+
+volatile __uint128_t a = 100;
+volatile __uint128_t b = 2;
+
+int main() {
+    __uint128_t result = a / b;
+    (void)result;
+    return 0;
+}
+" HAVE_UDIVTI3)
+if(NOT HAVE_UDIVTI3)
+    message(STATUS "Adding clang_rt_builtins due to missing __udivti3")
+    add_subdirectory(clang_rt_builtins)
+endif()
+
 # Glad
 add_subdirectory(glad)
 

externals/clang_rt_builtins/CMakeLists.txt

@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.10)
+project(clang_rt_builtins C)
+
+add_library(clang_rt_builtins STATIC udivti3.c)

externals/clang_rt_builtins/udivti3.c

@@ -0,0 +1,36 @@
+typedef unsigned __int128 tu_int;
+
+tu_int __udivti3(tu_int a, tu_int b)
+{
+    if (b == 0) {
+        // Handle division by zero (could also trigger a fault)
+        return 0;
+    }
+
+    if (b > a) {
+        return 0;
+    }
+
+    int shift;
+    for (shift = 0;; shift++) {
+        if (shift >= 128) {
+            break;
+        }
+        tu_int shifted_b = b << shift;
+        if (shifted_b > a || (shifted_b >> shift) != b) {
+            break;
+        }
+    }
+    shift--;
+
+    tu_int quotient = 0;
+    for (; shift >= 0; shift--) {
+        tu_int shifted_b = b << shift;
+        if (shifted_b <= a) {
+            quotient |= (tu_int) 1 << shift;
+            a -= shifted_b;
+        }
+    }
+
+    return quotient;
+}

externals/getopt/CMakeLists.txt

@@ -1,7 +1,7 @@
 # SPDX-FileCopyrightText: 2015 Greg Wicks <gpwicks@email.wm.edu>
 # SPDX-License-Identifier: GPL-2.0-or-later
 
-add_library(getopt
+add_library(getopt STATIC
     getopt.c
     getopt.h
 )
@@ -9,4 +9,4 @@ add_library(getopt
 create_target_directory_groups(getopt)
 
 target_compile_definitions(getopt PUBLIC STATIC_GETOPT)
-target_include_directories(getopt INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(getopt PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})