On 05/28/2013 11:38 AM, Zamir Khan wrote:
> I should probably clarify the situation (I'm not sure I provided enough info
> up front). The larger dependencies like ITK are pre-built (I guess one would
> assume this; we don't rebuild ITK or VTK with every build of our project). So
> I thought it would be a simple problem of overwrite and then
> restoring the ITK_DIR value at the right time (e.g. at the point of
> find_package(ITK ...) for the modules in question). I feel like we've almost
> got this working. There are some lingering issues that we're still solving,
> but the respective modules seem to reference the correct versions of ITK now.
> I
> guess I'm wondering whether this approach is doomed to fail for a reason we
> haven't anticipated.
>
> I'm doing the replacement as follows:
>
> # This module uses an older version of ITK (3.2) than the rest of
> # the project (4.31), so here we overwrite the ITK_DIR variable
> # so that the correct version is found.
> MESSAGE( STATUS "ITK_DIR_SECONDARY value: " ${ITK_DIR_SECONDARY})
>
> MESSAGE( STATUS "ITK_DIR value (before overwrite): " ${ITK_DIR})
> # Store the primary ITK directory in a temporary variable
> set(ITK_DIR_PRIMARY ${ITK_DIR})
> # Overwrite the ITK_DIR cache variable
> set(ITK_DIR ${ITK_DIR_SECONDARY} CACHE STRING "The directory containing a
> CMake configuration file for ITK" FORCE)
> MESSAGE( STATUS "ITK_DIR value (after overwrite): " ${ITK_DIR})
>
> FIND_PACKAGE(ITK 3.2)
> IF(ITK_FOUND)
> INCLUDE(${ITK_USE_FILE})
> ELSE(ITK_FOUND)
> MESSAGE(FATAL_ERROR "ITK not found. Please set ITK_DIR.")
> ENDIF(ITK_FOUND)
>
> # Restore the original (primary) ITK_DIR value
> SET(ITK_DIR ${ITK_DIR_PRIMARY} CACHE STRING "The directory containing a CMake
> configuration file for ITK" FORCE)
> MESSAGE( STATUS "ITK_DIR value (after restore): " ${ITK_DIR})
CACHE values are loaded only at the beginning of processing CMake code
so the FORCE set will not take effect until the next time you run CMake.
Instead set ITK_DIR as a normal (non-cached) variable:
set(ITK_DIR "${ITK_DIR_4_3}")
find_package(ITK 4.3)
...
set(ITK_DIR "${ITK_DIR_3_2}")
find_package(ITK 3.2)
That should get the package configuration file from each ITK loaded.
There may be other problems with multiple versions of ITK in a single
project but I can't enumerate any off the top of my head. Certainly
it will work only when the two find_package calls are in separate
subdirectories (via add_subdirectory) and cannot see each other.
-Brad
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