Fix version checks in CMake packages.

[alliepiper]

No description provided.

[alliepiper]

run tests

[robertmaynard]

This set of changes is insufficient for the following example:

list(APPEND CMAKE_PREFIX_PATH <path_to_thrust_1.12> <path_to_thrust_1.15>)
find_package(Thrust REQUIRED)
thrust_create_target(A::Thrust)

find_package(Thrust 1.15 REQUIRED)
thrust_create_target(B::Thrust)

The second find_package(Thrust) call will occur since we have added a VERSION value, but it will use the cached find_package(CUB) call since we don't propagate the requested VERSION argument down.

The naive solution ( as seen below ), resolves this issue:

diff --git a/thrust/cmake/thrust-config.cmake b/thrust/cmake/thrust-config.cmake
index 50e84ce7..ae108319 100644
--- a/thrust/cmake/thrust-config.cmake
+++ b/thrust/cmake/thrust-config.cmake
@@ -497,7 +497,8 @@ endfunction()
 macro(_thrust_find_CUDA required)
   if (NOT TARGET Thrust::CUDA)
     thrust_debug("Searching for CUB ${required}" internal)
-    find_package(CUB CONFIG
+    find_package(CUB ${THRUST_VERSION} CONFIG
       ${_THRUST_QUIET_FLAG}
       ${required}
       NO_DEFAULT_PATH # Only check the explicit HINTS below:

A full reproducer can be found at: https://gist.github.com/robertmaynard/c6a784e7e78d318cba2ae1e71805c618

[alliepiper]

Fixed in #1603