set platform=%~1
set target=unknown
set flags=-c -O3

if "%platform%"=="win32" (
  set target=i386-pc-win32
) else if "%platform%"=="win64" (
  set target=x86_64-windows
) else if "%platform%"=="linux32" (
  set target=i386-linux
) else if "%platform%"=="linux64" (
  set target=x86_64-linux
) else if "%platform%"=="mac32" (
  set target=i386-macos
) else if "%platform%"=="mac64" (
  set target=x86_64-macos
) else if "%platform%"=="android32" (
  set target=armv7-a-linux-android -march=armv7-a -mthumb
) else if "%platform%"=="android64" (
  set target=aarch64-linux-android
) else if "%platform%"=="ios32" (
  set target=armv7-a-apple
) else if "%platform%"=="ios64" (
  set target=arm64-apple
) else (
  echo error: unknown platform "%platform%"
  goto :done
)

...

call clang -target %target% %flags% "%sourcefile%" -o"%targetfile%"