[bug] system_libs are linked before objects causing undefined references

I have a recipe which includes compiled objects which depend on system libraries so I produce the following package info

    def package_info(self):
        self.cpp_info.objects = [os.path.join("lib", o) for o in objects]
        self.cpp_info.system_libs = ["pthread", "dl"]

however, the CMake config files produced link the system libs before the objects, which, on some systems, makes the linker not find the required symbols:

(.text+0x191a89): undefined reference to `pthread_setaffinity_np'
(.text+0x191aba): undefined reference to `dlsym'

seems like the order should be reversed in https://github.com/conan-io/conan/blob/0eb405bde999d5b7b8e706b206940d2e24aa828e/conan/tools/cmake/cmakedeps/templates/target_configuration.py#L117-L120

Environment Details (include every applicable attribute)

• Operating System+version: Ubuntu 18.04
• Compiler+version: GCC 8
• Conan version: 1.44.1

Steps to reproduce (Include if Applicable)

see above

[dvirtz]

Hi @dvirtz,

Thanks for the tips, Do you put this snippet in package_info method of conanfile.py of consumer? For example in my case, in conanfile.py of glog consumer?

no, I put it in the package_info of the package exporting those objects, so maybe this is not relevant if you don’t control the dependency

[memsharded]

We plan to branch 1.49 today if possible. I don’t think there is any reasonable workaround, beyond redefining targets variables directly in your consumer CMakeLists.txt after the find_package()