Install turtle using cmake's FetchContent

[dohashi]

I don't know if this counts as a turtle issue, but I want to add turtle to my project using cmake's FetchContent. It downloads ok, but using the suggested technique did not lead to a functional install of turtle. Ideally, the following would work:

cmake_minimum_required( VERSION 3.11 )

project(test_proj)

include(FetchContent)

FetchContent_Declare(
    turtle
    GIT_REPOSITORY [e-mail]:mat007/turtle
    GIT_TAG v1.3.2
)

FetchContent_MakeAvailable( turtle )

add_executable( test test.cpp )

Where test.cpp tries to #include "turtle/mock.hpp"

I've tried with and without defining TURTLE_INSTALL to ON. It seems like the install step is not working in a way that is compatible with what FetchContext expects.

In case anyone else runs into this, I was able to make it work using this:

FetchContent_Declare(
    turtle
    GIT_REPOSITORY [e-mail]:mat007/turtle
    GIT_TAG v1.3.2
)

FetchContent_GetProperties(turtle)
if(NOT turtle_POPULATED)
  FetchContent_Populate(turtle)

  include_directories( ${turtle_SOURCE_DIR}/include )
endif()

This adds the include directory from the source tree, which seems to work.

[Alexander Grund]

FetchContent makes the library available to CMake. It is basically a fancy add_subdirectory. See the CMake documentation about that feature.

Hence you need to link to turtle just as with any other (CMake) library. I.e. you are missing a target_link_libraries(test PRIVATE turtle::turtle)

Add this to the bottom of your initial example and it will work just fine. Nothing else needed.

[dohashi]

Ah, that works. Thank you.