Itk: FFTW libraries not found by externally built remote module on Windows

[dzenanz]

Trying to build current master (eece13d) of ITKMontage by pointing to current master (67eb78ed6d7643717af33d8441997ef28d86ea9b) of ITK results in link errors.

6>------ Build started: Project: MontageTestDriver, Configuration: RelWithDebInfo x64 ------
6>LINK : fatal error LNK1104: cannot open file 'fftw3_threads.lib'

The library itself exists:

Environment

Windows 10 x64, VS2019, ITK itself compiled with v140 toolset, CMake 3.17.3. I don't think that version details are important, just being Windows is probably enough. I didn't try to reproduce it on other systems.

[hjmjohnson]

Perhaps we should restore the previous cmake behavior:

if(win32)
message(FATAL_ERROR "FFTW internal build not supported on windows, set ITK_USE_SYSTEM_FFTW")
endif()

[SimonRit]

RTK nightly builds fail on Windows since the last update of FFTW even if it uses externally built FFTW, see here. Should I change my build code to use the new variable names, i.e., FFTWD_LIBRARIES and FFTWF_LIBRARIES instead of FFTWD_LIB and FFTWF_LIB?

[SimonRit]

Solving #1930 did not solve externally built RTK, see, e.g., here.

[dzenanz]

I still get link errors on Windows, as of 85cb1d5860f81cbb3f35606b71e4cf73188837bd from yesterday.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. Thank you for your contributions.

[SimonRit]

I think I have fixed this issue for RTK, see SimonRit/RTK#407. Don't hesitate to comment there if you agree (or not) with the solution!