[CMake] Cache variables from module

[Isaiah Norton]

PARENT_SCOPE and CACHE can't be used in the same call, presumably because
cache is global. So cmake doesn't recognize those arguments, and instead
sets the variable PETSC_VERSION to a list containing all the following
arguments except PARENT_SCOPE (which does still apply). Perhaps a newer
cmake version will give an error.
Try:

    set (PETSC_VERSION "${PETSC_VERSION_MAJOR}.${PETS
C_VERSION_MINOR}.${PETSC_VERSION_SUBMINOR}" CACHE INTERNAL "PETSc
version")

(possibly also with `FORCE`, though it probably doesn't make sense for a
user to ever set that manually)

On Thu, May 3, 2018 at 3:36 AM, Florian Lindner <mailinglists at xgm.de> wrote:

> Hello,
>
> I have a third party FindPETSc.cmake module:
>
> https://github.com/jedbrown/cmake-modules/blob/master/FindPETSc.cmake
>
> The problem I have, is that variable PETSC_VERSION is not set when cmake
> is run for a second time
>
> https://github.com/jedbrown/cmake-modules/issues/28
>
> What is best way to deal with that?
>
> Can an entire function be cached, e.g. petsc_get_version or is adding
> CACHE to the set calls of PETSC_VERSION the best way?
>
> Adding CACHE INTERNAL gives me error messages:
>
> set (PETSC_VERSION "${PETSC_VERSION_MAJOR}.${PETSC_VERSION_MINOR}.${PETSC_VERSION_SUBMINOR}"
> CACHE INTERNAL "PETSc
> version" PARENT_SCOPE)
>
>
> CMake Error at tools/cmake-modules/FindPETSc.cmake:314 (if):
>   if given arguments:
>
>     "3.8.4" "CACHE" "INTERNAL" "PETSc version" "VERSION_LESS" "3.1"
>
>   Unknown arguments specified
>
>
>
> Thanks!
> Florian
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