fix windows build

.circleci/config.yml

@@ -440,18 +440,23 @@ jobs:
               haxe compile-c.hxml
         - run:
             name: Compile MBHaxe (single translation unit)
-            shell: cmd.exe
             # Build the self-contained marblegame.c in one cl invocation (like compile.bat /
             # the macOS & Linux jobs) instead of MSBuild compiling ~900 split files serially
             # with whole-program optimization. HL_MAKE must NOT be defined so marblegame.c
             # #includes all the generated .c files into a single translation unit.
+            # The batch commands are written to a real .bat file so `%%i`/`for` work; running
+            # them via `shell: cmd.exe` directly does not (cmd treats it as inline, not a script).
             command: |
-              cd %USERPROFILE%\project\native
+              cd ~/project/native
+              cat > build.bat <<'EOF'
+              cd /d %USERPROFILE%\project\native
               if not exist x64\Release mkdir x64\Release
               for /f "usebackq delims=" %%i in (`"C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe" -latest -products * -find VC\Auxiliary\Build\vcvars64.bat`) do call "%%i"
               set HL=%USERPROFILE%\deps\hashlink
               cl /nologo marblegame.c /Fe:x64\Release\marblegame.exe /O2 /MD /DNDEBUG -I . -I "%HL%\src" -I "%HL%\include" "%HL%\x64\Release\libhl.lib" "%HL%\x64\Release\ssl.lib" "%HL%\x64\Release\ui.lib" "%HL%\x64\Release\datachannel.lib" "%HL%\x64\Release\openal.lib" "%HL%\x64\Release\uv.lib" "%HL%\x64\Release\fmt.lib" "%HL%\x64\Release\sdl.lib"
               if not exist x64\Release\marblegame.exe exit /b 1
+              EOF
+              cmd.exe //c build.bat
         - run:
             name: Package app bundle
             command: |