macOS: modernize the DROD RPG build

.gitignore

@@ -142,5 +142,11 @@ Master/Darwin/steam/
 Master/Darwin/deps/
 # Local game data (.dat) for dev builds — copyrighted, never committed
 Master/Darwin/localdata/
+# DROD RPG macOS build output (reuses the main game's Master/Darwin/deps)
+drodrpg/Master/Darwin/custom/
+drodrpg/Master/Darwin/release/
+drodrpg/Master/Darwin/debug/
+drodrpg/Master/Darwin/steam/
+drodrpg/Master/Darwin/localdata/
 .DS_Store
 .idea

CompilingDrod_macOS.md

@@ -175,3 +175,35 @@ apart from the Steam TSS data in `localdata/TSS/` (`drod-tss5_0.dat`). It is the
 same binary as a full standalone TSS, so it shares the `custom/` build objects — no
 recompile when switching between them. TSS-standalone only (not with `--game` /
 `--steam`).
+
+## DROD RPG
+
+DROD RPG is a separate game (`drodrpg/`) with its own copy of this modern build
+system in **`drodrpg/Master/Darwin`**. Build it exactly the same way:
+
+```
+cd drodrpg/Master/Darwin
+./build_macos.sh                    # -> "DROD RPG 2.app" under custom/bin/
+./build_macos.sh --steam --steam-appid   # Steam build (AppID 3661610)
+```
+
+`make drod-custom` / `make drod-release` / `make drod-steam` build just the binary.
+`--universal`, `--dmg`, `--build-type`, `--output` and `--name` behave as above.
+
+Notes specific to DROD RPG:
+
+- **Shared code.** DROD RPG uses the repo-root `BackEndLib` and `FrontEndLib`
+  (only `DRODLib`, `CaravelNet`, `DROD`, `DRODUtil` live under `drodrpg/`). The
+  Makefile sources those two modules from the repo root automatically.
+- **Shared dependencies.** It reuses the main game's from-source libraries in
+  `Master/Darwin/deps` and the repo-root `metakit` submodule — the dep sets are
+  identical, so they are built once by `Master/Darwin/build_deps.sh` (invoked
+  automatically). Build the main game's deps first, or just run RPG's
+  `build_macos.sh` without `--skip-deps` and it bootstraps them.
+- **Game data.** Same three-source split as the main game (see *Game assets*
+  above). The data file is `drodrpg2_0.dat` — the real build (tilesets,
+  music and sounds baked in) is not open-source; drop it into
+  `drodrpg/Master/Darwin/localdata/` (gitignored). The loose Fonts + UI Bitmaps
+  come from the private **`drodrpgData`** repo (auto-detected as a sibling, or
+  `--assets /path/to/drodrpgData`); `Help/` and `Licenses/` come from this repo.
+  It is a single game, so there is no `--game` / variant selection.

drodrpg/DROD/DrodScreen.cpp

@@ -1138,9 +1138,10 @@ void CDrodScreen::EditGlobalVars(
 				wstrValue = pGame->GetArrayVarAsString(itemID);
 			} else if (vType == UVT_int) {
 				int iVarValue = stats.GetVar(varName, (int)0);
-				std::basic_stringstream<WCHAR_t> stream;
-				stream << iVarValue;
-				wstrValue = stream.str();
+				// libc++ (macOS) has no std::ctype<char16_t>, so a
+				// basic_stringstream<WCHAR_t> won't compile; use _itoW.
+				WCHAR wszIBuf[16];
+				wstrValue = _itoW(iVarValue, wszIBuf, 10);
 			}
 			else {
 				wstrValue = stats.GetVar(varName, WS("0"));

drodrpg/DROD/EntranceSelectDialogWidget.cpp

@@ -589,9 +589,10 @@ void CEntranceSelectDialogWidget::PopulateListBoxFromHoldVars(CCurrentGame* pGam
 			wVarValue += wszRightBracket;
 		} else if (vType == UVT_int) {
 			int iVarValue = stats.GetVar(varName, (int)0);
-			std::basic_stringstream<WCHAR_t> stream;
-			stream << iVarValue;
-			wVarValue = stream.str();
+			// libc++ (macOS) has no std::ctype<char16_t>, so a
+			// basic_stringstream<WCHAR_t> won't compile; use _itoW.
+			WCHAR wszIBuf[16];
+			wVarValue = _itoW(iVarValue, wszIBuf, 10);
 		} else {
 			wVarValue = stats.GetVar(varName, WS("0"));
 		}

drodrpg/DRODLib/I18N.cpp

@@ -51,23 +51,26 @@ namespace I18N {
 		bool bHasModifier = bIsShift || bIsCtrl || bIsAlt;
 		bool bHasNonModifier = keyCode != SDLK_UNKNOWN;
 
-		std::basic_stringstream<WCHAR> str;
+		// Plain WSTRING concatenation rather than a basic_stringstream<WCHAR>:
+		// libc++ (macOS) lacks the std::ctype<char16_t> facet that char16_t
+		// streams need.
+		WSTRING str;
 
 		if (bIsShift) {
-			str << (wModifierCount > 1 && bHasNonModifier ? ShiftShort : ShiftLong);
+			str += (wModifierCount > 1 && bHasNonModifier ? ShiftShort : ShiftLong);
 		}
 
 		if (bIsCtrl) {
-			str << (wModifierCount > 1 && bHasNonModifier ? CtrlShort : CtrlLong);
+			str += (wModifierCount > 1 && bHasNonModifier ? CtrlShort : CtrlLong);
 		}
 
 		if (bIsAlt) {
-			str << (wModifierCount > 1 && bHasNonModifier ? AltShort : AltLong);
+			str += (wModifierCount > 1 && bHasNonModifier ? AltShort : AltLong);
 		}
 
 		if (keyCode != SDLK_UNKNOWN)
-			str << g_pTheDB->GetMessageText(InputCommands::KeyToMID(keyCode));
+			str += g_pTheDB->GetMessageText(InputCommands::KeyToMID(keyCode));
 
-		return str.str();
+		return str;
 	}
 }