[Build] CMake failure with span-lite for out-of-source build

[mboisson]

When configuring with CMake, I get the following error:

389 CMake Error at CMakeLists.txt:313 (add_subdirectory):
390   add_subdirectory not given a binary directory but the given source
391   directory
392   "/tmp/mboisson/avx2/ArrayFire/3.9.0/gccflexiblascuda-2020.1.122/easybuild_obj/extern/span-lite-src"
393   is not a subdirectory of
394   "/tmp/mboisson/avx2/ArrayFire/3.9.0/gccflexiblascuda-2020.1.122/arrayfire-full-v3.9.0".
395   When specifying an out-of-tree source a binary directory must be explicitly
396   specified.
397
398
399 CMake Error at CMakeLists.txt:314 (get_property):
400   get_property could not find TARGET span-lite.  Perhaps it has not yet been
401   created.
402
403
404 CMake Error at CMakeLists.txt:317 (set_target_properties):
405   set_target_properties Can not find target to add properties to: span-lite
406
407
408 CMake Error at CMakeLists.txt:319 (set_target_properties):
409   set_target_properties Can not find target to add properties to: span-lite
410
411

It looks like the line https://github.com/arrayfire/arrayfire/blob/master/CMakeLists.txt#L313 should specify a "build" directive ? (according to https://stackoverflow.com/questions/50408169/cmake-error-add-subdirectory-not-given-a-binary-directory )

[melonakos]

Thank you for reporting. We are working on the fix.

[mboisson]

For what it's worth, this is the patch I applied to our local build https://github.com/ComputeCanada/easybuild-easyconfigs/blob/computecanada-main/easybuild/easyconfigs/a/ArrayFire/ArrayFire-3.9.0-CMakeList.patch