[CMake] Reruning cmake and environment variables

[Michael Wild]

On 1. Nov, 2009, at 16:27 , elizabeta petreska wrote:

> Hello
>
> I am using Windows ansd Cmake 2.6. I am invoking CMake from command  
> window
> which has set some environment  variables. The environment   
> variables are
> visible only the during the lifetime of the command window.
> I am using the environment  variables in many places through my
> cmakelists.txt , for example in INCLUDE_DIRECTORIES, LINK_LIBRARIES  
> etc. The
> environment  variables are mainly set with file path strings.
>
> Problem :
> When I am working in Visual Studio on my project, if my  
> cmakelists.txt for
> the project is changed, Cmake is rerun from Visual Studio.
> Because  Cmake is run from Visual Studio , and not the shell where the
> environment  variables are set , it can't recognize the environment
> variables. How to overcome this ?
> Thanks

Somewhere short after the PROJECT command, put something like this:

foreach(_var VAR1 VAR2 VAR3 VAR4)
   if(NOT DEFINED ${_var})
     set(${_var} "$ENV{${_var}}" CACHE INTERNAL "This is my super  
variable ${_var}")
   endif()
endforeach()

This will initialize internal cache variables with the values from the  
environment, and then in subsequent runs use the values from the cache.


HTH

Michael