libSI’s CMake Support

Option 1: Using FetchContent

Pull it at configure time — no vendored copy in your tree:

include(FetchContent)
FetchContent_Declare(libSI
  GIT_REPOSITORY https://github.com/fleschutz/libSI.git
  GIT_TAG        v0.4)            # pin a release tag
FetchContent_MakeAvailable(libSI)

target_link_libraries(myapp PRIVATE libSI::libSI)

Option 2: Using add_subdirectory

Vendor the project (a submodule or a copy) and add it:

add_subdirectory(libSI)
target_link_libraries(myapp PRIVATE libSI::libSI)

Linking the target propagates the include directory, so you do not set either yourself.

Option 3: Using find_package

If libSI is installed (via cmake --install, or a Linux package), consume it with find_package:

find_package(libSI CONFIG REQUIRED)
target_link_libraries(myapp PRIVATE libSI::libSI)

Option 4: Copy the headers (no CMake)

Put SI/ on your compiler’s include path and build with C++23 (-std=c++23 on GCC and Clang, /std:c++latest on MSVC). Nothing else is required.