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Description of problem:
In latest module build llvm-toolset:rhel8:8090020230510011837:b46abd14 the %{clang_resource_dir} points to a non existing directory (/usr/lib64/clang/16.0.0).
It seems to be because in previously there were two directories under /usr/lib64/clang/, one being %major.%minor.%patch and other being only %major. This has changed in clang 16 and now only one directory exists, which is (/usr/lib64/clang/16).

It looks like changing the macro definition [1] with the respective change from fedora [2] might fix the issue.

[1] https://gitlab.com/redhat/centos-stream/rpms/clang/-/blob/stream-llvm-toolset-rhel8-rhel-8.9.0/macros.clang#L11
[2] https://src.fedoraproject.org/rpms/clang/c/4cb2bd60c5856d81b8dc2c4beee7f54fc308bd69?branch=rawhide

Version-Release number of selected component (if applicable):
clang-devel-16.0.0-1.module+el8.9.0+18819+1c91450f.x86_64
clang-resource-filesystem-16.0.0-1.module+el8.9.0+18819+1c91450f.x86_64

How reproducible:
100%

Steps to Reproduce:
1. dnf install -y clang-devel
2. ls $(rpm -E "%{clang_resource_dir}")

Actual results:
ls: cannot access '/usr/lib64/clang/16.0.0': No such file or directory

Expected results:
%{clang_resource_dir} should expand to /usr/lib64/clang/16/

Additional info:
Fedora builds and RHEL9.3 builds are not affected by this issue.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (llvm-toolset:rhel8 bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:6985