This Repo demonstrates a bug found in conan1 version >=1.47 (tested with 1.47 and 1.60). The bug is caused by diamond dependency variation, where the root downstream package overrides an upstream dependency, which is requried transitive by other packages as well but in a lower version.

The follwing diagram illustrates the dependency graph:

In order to reproduce the bug, you need to run the build.sh script in the root of this repository.

In the end you should recieve the following error message:

WARN: libc/0.1: requirement liba/0.1 overridden by libd/0.1 to liba/1.0
ERROR: libb/0.1: requirement liba/0.1 overridden by libc/0.1 to liba/1.0

The error does not occure, when liba is not set explicitley as an requirement of libc but retrieved implicit through libb. It also does not occure when override=True is added to the requires statement of liba in libc. This bug seems to be no solved in conan2.