Dependency tracking does not work with macros in BuildRequires

[dschmidt]

Problem description or feature wish

I created a dep-filesystem package and a dep-somepackage that depends on the filesystem package. Both times the dep-Prefix is defined in prjconf as %{_dep_pkg_prefix}. Accordingly the spec files contain only references to %{_dep_pkg_prefix}-filesystem and %{_dep_pkg_prefix}-somepackage

Currently on initial build dep-somepackage stays unresolvable until dep-filesystem succeeded.

This has another unwanted consequence:
If there's a third package dep-somelib, that depends on dep-filesystem and dep-somepackage depends on that and dep-filesystem it will be rebuilt when either of them finishes its build, triggering way too many rebuilds.

Expected result

When an RPM spec file provides packages with macros in their names, they should be correctly tracked.
When building the repository dep-somepackage should be blocked by dep-filesystem.

A reference to a public OBS instance showing the issue

https://build.opensuse.org/project/monitor/home:pansenmann:dependencies

[jnweiger]

Mabye unrelated, but today I had a situation, where changing prjconf did not start any rebuilds. Manually triggered rebuilds started immediately.

[m407]

May by it is unrelated but I found that versions are also ignored in BuildRequires:
My spec contains
BuildRequires: php >= 7.0.0
But while build process I get
[ 4s] [138/141] cumulate php5-5.5.14-63.1