`target_include_directories` on line 120 for on `lib/CMakeLists.txt` would make configuration step failed when this project (clspv_core) is linked by other project.

[Dalmurii]

Line 120 of lib/CMakeLists.txt is as following:

target_include_directories(${clspv_lib} PUBLIC ${CLSPV_INCLUDE_DIRS})

Currently, I've seen a variable CLSPV_INCLUDE_DIRS containing:

• Directory include on root directory which SHOULD be public.
• Directory prefixed on build which SHOULD be private.

This is an brief of fix in my opinion:

# The include directory which SHOULD be public.
target_include_directories(
  ${clspv_lib} INTERFACE
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include/> # Include directory on build state
  $<INSTALL_INTERFACE:include/> # include directory as installed.
)

# The include directory which SHOULD be private.
target_include_directories(
  ${clspv_lib} PRIVATE
  ${CLSPV_INCLUDE_DIRS}
)

[Dalmurii]

The script above seems to be not a proper fix since it somehow does not generate the tests for default.
I will open a pull request for this after I manage to resolve this current issue.