From: Herman Schultz <phermans@...>
Date: 2009-12-03T06:44:57+09:00
Subject: Re: Rake Environment variables gone missing

Aldric Giacomoni wrote:
> Herman Schultz wrote:
>> 
>> Here's the issue.  I read in a windows batch file that has a bunch of
>> environment variable in it that are used in a hornets nest of Devstudio
>> C++ projects.  I want to parse the variables out and pass them to ENV so
>> I can invoke incredibuild from rake.
>> 
> Herman,
> Could you convince me that you're not doing any kind of useless steps, 
> here? How about just doing the parsing from within Ruby/Rake ?

Well the problem is that the vcproj files are all based on environment 
variables.  The defines, the compiler options, the include paths, and 
the paths to the libraries for linking.


So you have things like
...
<Tool
 Name="VCCLCompilerTool"
 AdditionalOptions="$(GQT_DRIVER_DEB_DEFINES)"
...
in the environment batch file it looks like this

SET GQT_REL_DEFINES=%COMMON_DEFINES% %COMMON_REL_DEFINES% /D 
XERCES_TMPLSINC %COMMON_LIBRARY_DEFINES%

The project was setup like this by the team in such a way that you have 
to run the batch script before you open the vcproj file. If you just 
double click it from an explorer window, for example, it won't work.

Likewise if you're automating the build, you need to have the 
environment resolved before you build.  So if you want to shell out from 
rake to invoke the build you need to have that environment set.

In the passed, I used to chain the calling the environment script to the 
call to incredibuild.

Something like

result = system( "setEnvironment.bat;{incredibuild statement}" )

There were issues with that as I remember, so I wrote some ruby code to 
parse the environment batch file and set the environment.  It works fine 
on smaller projects but this one is gianormous.

Finally, once I had all the environment variables, I could insure that 
the build verification tests and the publishing scripts were all pulling 
the same files as the build system had used. I like that; single point 
of failure and all.

So if I am going to try to slide under the limit ( if that indeed is my 
problem ) I'll need to identify those variables which devstudio needs to 
have resolved vs. what variables I can read from rake at run time.

thanks again for the help.  I did try today, but I wasn't able to get 
under the limit.  I'll need a sharper knife.


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