feat: implement M1 Ferro frontend

fec/build-dos.bat

@@ -0,0 +1,29 @@
+@echo off
+rem Open Watcom C89 build. TEST-DOS.BAT runs this from C:\FEC.
+C:
+cd \FEC
+if exist BUILD.OK del BUILD.OK
+if exist BUILD.FAIL del BUILD.FAIL
+if exist fec.exe del fec.exe
+if exist __wcl__.lnk del __wcl__.lnk
+if exist arena.obj del arena.obj
+if exist diag.obj del diag.obj
+if exist lexer.obj del lexer.obj
+if exist ast.obj del ast.obj
+if exist parser.obj del parser.obj
+if exist driver.obj del driver.obj
+
+if "%WATCOM%"=="" set WATCOM=C:\DEVEL\WATCOMC
+if not exist %WATCOM%\BINW\WCL.EXE goto build_fail
+set PATH=%WATCOM%\BINW;%WATCOM%\BINP;%PATH%
+wcl -q -za -wx -bt=dos -k32768 -fe=fec.exe src\arena.c src\diag.c src\lexer.c src\ast.c src\parser.c src\driver.c
+if errorlevel 1 goto build_fail
+if not exist fec.exe goto build_fail
+echo OK>BUILD.OK
+cd C:\FEC
+goto build_done
+
+:build_fail
+echo FAIL>BUILD.FAIL
+
+:build_done