win32.mak: fix target checkwhitespace

[rainers]

Current version fails if the tools folder already exists:

git clone --depth=1 https://github.com/dlang/tools ..\..\tools
fatal: destination path '..\..\tools' already exists and is not an empty directory.

Also removes references to non-existing files and adds more files to be checked.

[CyberShadow]

Current version fails if the tools folder already exists:

Why would the tools directory exist but not contain a checkwhitespace.d? An old checkout? In which case, allowing the git command to fail is not going to help move things along, will it?

[rainers]

Why would the tools directory exist but not contain a checkwhitespace.d?

The git command is executed unconditionally by DM make and fails if the directory exists and is non-empty. Ignoring the result forwards the error checking to the compilation of checkwhitespace.d: if it actually doesn't exist dmd will complain.

[CyberShadow]

The git command is executed unconditionally by DM make and fails if the directory exists and is non-empty.

Huh, is that so? Since the $(TOOLS_DIR)\checkwhitespace.d rule has no dependencies, wouldn't it be executed iff the file doesn't exist?

[rainers]

Every other make behaves as expected, but not the Digital Mars version:

c:\tmp\make>type Makefile

Makefile:
        echo $@ does not exist!?

c:\tmp\make>c:\l\d\dmd2.074\dmd2\windows\bin\make.exe
echo Makefile does not exist!?
Makefile does not exist!?

c:\tmp\make>make
make: `makefile' is up to date.

c:\tmp\make>nmake

Microsoft (R) Program Maintenance Utility Version 12.00.21005.1
Copyright (C) Microsoft Corporation.  All rights reserved.

'Makefile' is up-to-date

[CyberShadow]

Huh. Well, thanks for the clarification.