Hi,
On 1/7/07, Peter Tanski
I looked at Issue 49, on setting the correct environment variables for a Visual Studio (Visual C++) toolset using vcvars32.bat or whatever the correct batch file is (see below). This shouldn't be too hard to do but I don't know which SCons files I should modify for this. If any of you have extra time, would you please point me in the right direction?
build/platform.py is definitely the best place to do it as the function win32 is only called for Windows builds. It's slightly complicated by the attempts I made a getting Yhc to build under GHC on Windows, but never got to work. Getting the right environment variables is probably complicated enough to warrant a new file with a function called from build/platform.py, but it could be included in the same function. The basic strategy I want to try is this:
1. find the correct Visual Studio build by querying the system and finding the %VSnnCOMNTOOLS% installation. In DOS, this would be as simple as:
C:\> set | find "COMNTOOLS" VS80COMNTOOLS=C:\....
The dictionary os.environ is probably what you're looking for. 2. find the correct vcvars32.bat or vsvars32.bat (possibly by
searching the Start Menu for the Visual Studio [version] Command Prompt) and examining the shortcut. There are only two "Start Menu" systems to check, the current User and "All Users." There is a program, 'getlnk' from Bamboo Software <http://www.inwa.net/~frog/ bamboo.htm> to query the .lnk file in case there isn't a Windows program. (Note: easiest solution is to query the settings in the Registry, under \Software\Microsoft\VisualStudio\[version]\External Tools, I believe. I haven't explored this thoroughly and expect there is some cool Python or scons function for that purpose.)
http://sourceforge.net/projects/pywin32/ will let you query the registry. I'm not sure if it is included in the main Python windows installer, but it is definitely include in ActiveState's ActivePython. 3. run the batch file and query the environment variables Is the batch file simple enough to use regular expressions to extract the values? That might be easier? 4. propagate the variables into scons ENV
... after this, if Yhc ever needs the Visual Studio tools again, it might be able to perform the same process after (or during) installation.
This is as simple as env["CC"] = "path to compiler" Hope this helps, Andrew