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From: Mark Hadfield <m DOT hadfield AT niwa DOT co DOT nz>
Subject:  Re: setting Win32 environment variables in Cygwin
Date:  Thu, 21 Jul 2005 09:38:02 +1200
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Alex Goldman wrote:
> When I execute a *.bat file containing lines like
> 
> Set FOO=12345
> 
> FOO does not show up in the environment of the Cygwin shell. Further,
> if I execute Win32 programs that access the environment, they can not
> see FOO either.

It's not clear what you're doing from your description, but if you are 
opening a Cygwin shell (eg bash), invoking cmd.exe to process the batch 
file and returning to bash, then you certainly won't see FOO in bash.

> Specifically, I need to do
> 
> Set PATH=C:\Program Files\Microsoft Visual C++ Toolkit 2003\bin;%PATH%
> Set INCLUDE=C:\Program Files\Microsoft Visual C++ Toolkit 2003\include;%INCLUDE%
> Set LIB=C:\Program Files\Microsoft Visual Studio .NET
> 2003\Vc7\lib;C:\Program Files\Microsoft Visual C++ Toolkit
> 2003\lib;%LIB%
> 
> So that VC++ will run properly from the command line. Any suggestions?

There was a question in the last day or two about running Digital/Compaq 
Visual Fortran from a Cygwin shell. My answer pretty much applies here.

   http://cygwin.com/ml/cygwin/2005-07/msg00849.html

I've also expounded on this in the past, mostly in connection with 
Fortran compilers. A bit of judicious searching might uncover some more 
info.

You should write bash commands to set the environment variables. You can 
invoke them at the prompt or bundle them in a bash function and invoke 
that. (It's no good putting them in a shell script and processing it 
with /bin/bash: it'll all be forgotten when the subprocess exits.) You 
do have to be careful with characters that need quoting (backslash, 
semi-colon, space). You also have to allow for the fact that PATH is 
automagically converted between Unix and Windows forms, but the others 
aren't. The above link gives an example of how to deal with all these 
issues.

By the way, do you really want to *prepend* entries to the LIB and 
INCLUDE environment variables (as opposed to starting from scratch)? If 
so, you'd better make sure the existing variables are in the Windows 
format expected by your compiler. Ending up with INCLUDE set to 
something like:

C:\Program Files\Microsoft Visual C++ Toolkit 
2003\include;/usr/local/include:/usr/include

would not be cool.



-- 
Mark Hadfield          "Kei puwaha te tai nei, Hoea tahi tatou"
m DOT hadfield AT niwa DOT co DOT nz
National Institute for Water and Atmospheric Research (NIWA)


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