Per the docs and CMake, I see there are still:

-D32BIT       "Build 32-bit (r4) FMS library"        DEFAULT: OFF
-D64BIT       "Build 64-bit (r8) FMS library"        DEFAULT: OFF

as options. However, I'm not sure you can build FMS (2025.04) any more with both on. I tried recently building FMS with those both on (since that is the way we've built it with GEOS since time immemorial) but when you try, you get a hojillion CMake errors like:

CMake Error at CMakeLists.txt:784 (target_link_libraries):
  Target "check_time_sum" links to:

    FMS::fms

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

I think that's because when you build with -D32BIT=ON -D64BIT=ON the targets created are FMS::FMS_r4 and FMS::fms_r8 but the CMake is assuming the FMS target will be FMS::fms.

For now, I'm going to try and see if I can get the multi-precision variant (aka FMS::fms) working with GEOS because, well, that's what we actually want to use, but I wanted to ask if this was expected.

Perhaps the CMake being triggered should be avoided if not building as multi-precision?