[question] How to use cmake interface library with target sources?

In my CMakeLists.txt I create an interface library, add sources to it and then link it to an executable. When I try to consume it I get lots of undefined references. CMakeLists.txt example:

add_library(MyLib INTERFACE)
target_sources(MyLib INTERFACE util.cxx)
add_executable(SomeTarget main.cxx)
target_link_libraries(SomeTarget MyLib)

The project where I am creating the library and using it in the tests The conan recipe The project in which I try to use the library

I want conan to create a target like “MyLib” with the sources so I can link to it in the consuming project. I tried to use “self.cpp_info.srcdirs” but it did not work.

• I’ve read the CONTRIBUTING guide.

[memsharded]

Hi @malachib

No, this didn’t get enough priority, so it was moved to 2.X (which means the backlog of new features to be addressed after 2.0 becomes generally available).

If you could elaborate a bit more what is your use case for doing pure sources target, instead of a compiled library, that would help for the future potential implementation and testing of this feature.

[malachib]

Hi @memsharded sure I would be happy to share.

The library estdlib supports a few embedded platforms, namely esp32/esp-idf , Raspberry Pi Pico and historically Arduino. These usually use gcc, but with wildly different versions. The library itself is designed for extremely high portability between MPUs and also includes a few platform-specific helpers, in particular FreeRTOS.

For esp-idf, it’s conceivable that compiling a static library on an older version of their GCC toolchain+SDK will be OK when linking against a newer GCC/LD, but that makes me nervous. More wise people than me probably could inform me one way or the other.

For Raspberry Pi Pico, INTERFACE is necessary because FreeRTOS may or may not be present - and if it is - additional include pathing supplied by the application must flow down into the library.

Finally, I’d like those with MPUs I haven’t vetted recently, or ever, to be able to nab the library and use it. Historically it worked great on AVR and Blackfin, but those toolchains I don’t even have installed now