[CMake] Accessing cache variable from CTest script

[David Cole]

On Fri, Aug 24, 2012 at 9:46 AM, Davide Mancusi <arekfu at gmail.com> wrote:
>
> Hello everyone,
>
> I have tried asking this question on stackoverflow [1] without much
> luck, so here we go:
>
> My project links to a third-party library that comes with a valgrind
> suppression file, as well as a CMake script. The script stores the
> location of the suppression file in a CMake cache variable.
>
> I have written a CTest script to build and test my project and I would
> like to use the suppression file during the memory-checking stage.
> Unfortunately, the CTest script does not seem to know anything about
> the CMake cache. How can I access the CMake cache variable from my
> CTest script?
>
> Thanks in advance for the help.
> Davide
>
> [1] http://stackoverflow.com/questions/12108741/access-cmake-cache-variable-from-ctest-script
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I've answered on stackoverflow directly.

For the mailing list record, here's the initial answer I gave there:


You can't directly access CMake cache variables from the ctest -S script.

However, you could possibly:

(1) include the third party CMake script in the ctest -S script with
"include" (after the update step, so the source tree is up to date)
(2) read the CMakeCache.txt file after the configure step to pull out
the cache variable of interest

For (1), the code would be something like:

  include(${CTEST_SOURCE_DIRECTORY}/path/to/3rdParty/script.cmake)

This would only be realistically possible if the script does only
simple things like set variable values that you can then reference. If
it does any CMake-configure-time things like find_library or
add_executable, then you shouldn't do this.

For (2):

  file(STRINGS ${CTEST_BINARY_DIRECTORY}/CMakeCache.txt result
    REGEX "^CURSES_LIBRARY:FILEPATH=(.*)$")
  message("result='${result}'")
  string(REGEX REPLACE "^CURSES_LIBRARY:FILEPATH=(.*)$" "\\1"
    filename "${result}")
  message("filename='${filename}'")