--debug-find not showing paths searched for find_library

Code
1

(running CMake 3.30.2)

I’m on macOS, and I have a call to find_library that looks like so, inside a CMake find module FindMoltenVK.cmake:

find_library(
  MoltenVK_LIBRARY
  NAMES MoltenVK
  HINTS ${PC_MoltenVK_LIBRARY_DIRS}
  DOC "MoltenVK location"
  NO_SYSTEM_ENVIRONMENT_PATH
  NO_CMAKE_SYSTEM_PATH
  NO_PACKAGE_ROOT_PATH
)

The idea is that I basically only want CMake to search paths I’ve added to the CMake prefix path for this particular library.

I am trying to debug the paths searched to verify that the appropriate areas are being searched, but I’m seeing the following puzzling output when generating with --debug-find:

CMake Debug Log at cmake/finders/FindMoltenVK.cmake:102 (find_library):
  find_library called with the following settings:

    VAR: MoltenVK_LIBRARY
    NAMES: "MoltenVK"
    Documentation: MoltenVK location
    Framework
      Only Search Frameworks: 0
      Search Frameworks Last: 0
      Search Frameworks First: 1
    AppBundle
      Only Search AppBundle: 0
      Search AppBundle Last: 0
      Search AppBundle First: 1
    CMAKE_FIND_USE_CMAKE_PATH: 1
    CMAKE_FIND_USE_CMAKE_ENVIRONMENT_PATH: 1
    CMAKE_FIND_USE_SYSTEM_ENVIRONMENT_PATH: 0
    CMAKE_FIND_USE_CMAKE_SYSTEM_PATH: 0
    CMAKE_FIND_USE_INSTALL_PREFIX: 1

  find_library considered the following locations:

  The item was found at

    /part/of/my/cmake/prefix/path/deps/lib/libMoltenVK.dylib

CMake is finding the library where I intend it to be found, but I have no debug output to confirm that only the right locations are being searched.

find_path output, on the other hand, is working correctly with --debug-find, and showing me the following:

  find_path considered the following locations:

    /part/of/my/cmake/prefix/path/deps/include/MoltenVK.framework/Headers/MoltenVK.h
    /part/of/my/cmake/prefix/path/deps/MoltenVK.framework/Headers/MoltenVK.h
    /part/of/my/cmake/prefix/path/deps/include/MoltenVK.h
    /part/of/my/cmake/prefix/path/deps/MoltenVK.h
    /part/of/my/cmake/prefix/path/deps/include/MoltenVK/MoltenVK.h
    /part/of/my/cmake/prefix/path/deps/MoltenVK/MoltenVK.h

(ignore that MoltenVK doesn’t actually ship a header by this name; I’m just showing that I’m getting correct debug output here).

I’m invoking find_path the same way I’m invoking find_library, like so:

find_path(
  MoltenVK_INCLUDE_DIR
  NAMES MoltenVK.h MoltenVK/MoltenVK.h
  HINTS ${PC_MoltenVK_INCLUDE_DIRS}
  DOC "MoltenVK include directory"
  NO_SYSTEM_ENVIRONMENT_PATH
  NO_CMAKE_SYSTEM_PATH
  NO_PACKAGE_ROOT_PATH
)

I’m being sure to clear my CMake cache (and in fact removing the whole build directory between generations); does anyone know why find_library is refusing to enumerate the paths it is searching?

2

Perhaps it found the library at the first path it checked. From what I recall, --debug-find might only show the paths up to the point it found what it was looking for, so if the first path contains the library, there won’t be any paths printed.

3

That seems to have been it. I guess by just removing the library from the intended spot I can check what all is being enumerated. Thanks for the help.