Impossible to change binary dir for userver subdirectory

[Anton3]

https://t.me/vfarme

Basically I have a monorepo with a structure like

- service_1
- service_2
- service_3
- third_party
  - userver

Each service can be deployed separately (or together) in a separate docker container. Every time I deploy or develop a service I need to rebuild userver along with the service source code, which takes really long time. make install would allow me to install userver in a separate docker image that I could use to build services. I do the same with Qt for example. When you install Qt you can just select modules you need to via find_package, so you don't need to constantly rebuild Qt.

@Anton3

build userver in a separate build dir, specify a custom build dir for userver in add_subdirectory, and bake the prebuilt userver build dir into the docker image

https://t.me/vfarme

So here is what I did (only for debug build in purpose).

I cloned userver to the docker under /opt/userver/userver, built userver in the docker under /opt/userver/userver/build-debug. Then in my CMakeLists.txt I did

set(USERVER_DIR /opt/userver/userver)

include(${USERVER_DIR}/cmake/SetupEnvironment.cmake)
include(GNUInstallDirs)

add_subdirectory(${USERVER_DIR} ${USERVER_DIR}/build-debug)

Now when I try to build my service I am getting a compilation error: https://pastebin.com/uP6fWicd

Looks like for some reason it's starting building userver again in project directory

@Anton3

I see, that's because we use CMAKE_BINARY_DIR instead of CMAKE_CURRENT_BINARY_DIR in quite a lot of places