Bug#1057151: clang-17: ClangTargets.cmake cannot find libclang-17.so.1

[Cordell Bloor]

Package: clang-17
Version: 1:17.0.6-1
Severity: normal
X-Debbugs-Cc: cg...@slerp.xyz, debi...@lists.debian.org

Dear Maintainer,

While attempting to update rocm-device-libs, I noticed that searching
for clang with find_package(Clang) will fail with an error. The
ClangTargets.cmake file expects libclang to be found at the path
"/usr/lib/llvm-17/lib/libclang-17.so.1", but the file is actually
installed to "/usr/lib/x86_64-linux-gnu/libclang-17.so.1".

The error encountred is:

```
CMake Error at /usr/lib/llvm-17/lib/cmake/clang/ClangTargets.cmake:833 (message):
The imported target "libclang" references the file

"/usr/lib/llvm-17/lib/libclang-17.so.1"

but this file does not exist. Possible reasons include:

* The file was deleted, renamed, or moved to another location.

* An install or uninstall procedure did not complete successfully.

* The installation package was faulty and contained

"/usr/lib/llvm-17/lib/cmake/clang/ClangTargets.cmake"

but not all the files it references.
```

The error can be reproduced with this minimal CMakeLists.txt:

```
cmake_minimum_required(VERSION 3.22)
project(example)
find_package(Clang)
```

Regards,
Cordell Bloor

-- System Information:
Debian Release: trixie/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.5.0-4-amd64 (SMP w/32 CPU threads; PREEMPT)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

Versions of packages clang-17 depends on:
ii binutils 2.41-7
ii libc6 2.37-12
ii libc6-dev 2.37-12
ii libclang-common-17-dev 1:17.0.6-1
ii libclang-cpp17 1:17.0.6-1
ii libclang1-17 1:17.0.6-1
ii libgcc-13-dev 13.2.0-7
ii libgcc-s1 13.2.0-7
ii libllvm17 1:17.0.6-1
ii libobjc-13-dev 13.2.0-7
ii libstdc++-13-dev 13.2.0-7
ii libstdc++6 13.2.0-7
ii llvm-17-linker-tools 1:17.0.6-1

Versions of packages clang-17 recommends:
ii llvm-17-dev 1:17.0.6-1
ii python3 3.11.4-5+b1

Versions of packages clang-17 suggests:
pn clang-17-doc <none>
pn wasi-libc <none>

-- no debconf information