Fix building with Clang 20

date: 3.0.4
tomlplusplus: Latest master as of writing since there's no stable release with the build fixes.

premake5.lua

@@ -159,12 +159,28 @@ filter({"platforms:Linux", "language:C++", "toolset:clang"})
     "deprecated-enum-enum-conversion",
     "attributes",
   })
+if os.istarget("linux") and string.contains(_OPTIONS["cc"], "clang") then
+  CLANG_BIN = os.getenv("CC") or _OPTIONS["cc"]
+  if tonumber(string.match(os.outputof(CLANG_BIN.." --version"), "version (%d%d)")) >= 20 then
+    filter({"platforms:Linux", "language:C++", "toolset:clang"})
+      disablewarnings({
+        "deprecated-literal-operator", -- Needed only for tabulate
+        "nontrivial-memcall",
+      })
+  end
+end
+
 filter({"platforms:Linux", "language:C++", "toolset:clang", "files:*.cc or *.cpp"})
   buildoptions({
     "-stdlib=libstdc++",
     "-std=c++20", -- clang doesn't respect cppdialect(?)
   })
 
+filter("files:third_party/tabulate/**")
+  defines({
+    "USE_CPP17",
+  })
+
 filter("platforms:Android-*")
   system("android")
   systemversion("24")

src/xenia/base/console_app_main_posix.cc

@@ -14,7 +14,7 @@
 #include "xenia/base/cvar.h"
 #include "xenia/base/logging.h"
 
-extern "C" int main(int argc, char** argv) {
+int main(int argc, char** argv) {
   xe::ConsoleAppEntryInfo entry_info = xe::GetConsoleAppEntryInfo();
 
   if (!entry_info.transparent_options) {

src/xenia/ui/windowed_app_main_posix.cc

@@ -17,7 +17,7 @@
 #include "xenia/ui/windowed_app.h"
 #include "xenia/ui/windowed_app_context_gtk.h"
 
-extern "C" int main(int argc_pre_gtk, char** argv_pre_gtk) {
+int main(int argc_pre_gtk, char** argv_pre_gtk) {
   // Before touching anything GTK+, make sure that when running on Wayland,
   // we'll still get an X11 (Xwayland) window
   setenv("GDK_BACKEND", "x11", 1);