Hi,
I’m working on a C library project that provides some examples.
The examples are contained in a self contained subproject, and can be built from both the top library project (as normal executable targets) or installed as a component.
When installed, the subproject itself gets copied, not the binaries. It can detect it’s not a subproject anymore, and switches to find_package() (config mode) to find the library.
I’d like to make things fancier, and dynamically add the library install prefix to the installed find_package()'s PATHS, so that no matter where the library project is installed, if the examples component is enabled, they’ll be able to find the library config file.
Now, I know that in this case, the CMAKE_INSTALL_PREFIX variable, and $<INSTALL_PREFIX gen exp, are of no use here. Configuration and generation phases are already over when it’s time to install.
Since the install target depends on ALL, what would be needed is a build time command with access to build time-only data. That’s not possible.
Maybe a install(CODE/SCRIPT?
For example, the cmake --install <dir> cli command let’s the user specify a base install dir. Is that path stored somewhere an install script can read?