[llvm-bugs] [Bug 44218] New: Unable to install clangd-8 and clang-tidy-8 at the same time from LLVM Ubuntu Xenial repositories

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44218

            Bug ID: 44218
           Summary: Unable to install clangd-8 and clang-tidy-8 at the
                    same time from LLVM Ubuntu Xenial repositories
           Product: Packaging
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: deb packages
          Assignee: unassignedbugs at nondot.org
          Reporter: funous at gmail.com
                CC: llvm-bugs at lists.llvm.org

I am using the LLVM repositories for Ubuntu Xenial (`deb
http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main`)  and I'd like to
install both `clangd-8` and `clang-tidy-8`. At the moment it's not possible,
but I did not find any documentation saying these two packages should be
incompatible.

Expected behaviour:
  - It's possible to install `clangd-8` and `clang-tidy-8` at the same time.

Actual behaviour:
  - Apt fails with the following error:
```
The following packages have unmet dependencies:
 clangd-8 : Breaks: clang-tools-8 (< 1:8.0.1-1) but
1:8.0.1~svn369350-1~exp1~20190820122438.78 is to be installed
```

Possibly related to https://bugs.llvm.org/show_bug.cgi?id=43254

To reproduce it I used docker, here is a minimal `Dockerfile` that shows the
issue:
```
FROM ubuntu:16.04
RUN echo "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8 main" >
/etc/apt/sources.list.d/llvm.list \
  && apt-get update
RUN apt-get install -y clangd-8 clang-tidy-8
```

Here is the full output of running `docker build .` with the `Dockerfile`
above:
```
Sending build context to Docker daemon  2.048kB
Step 1/3 : FROM ubuntu:16.04
 ---> 2a697363a870
Step 2/3 : RUN echo "deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-8
main" > /etc/apt/sources.list.d/llvm.list   && apt-get update
 ---> Running in fbb9e6520558
Get:1 http://archive.ubuntu.com/ubuntu xenial InRelease [247 kB]
Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [109 kB]
Get:3 http://apt.llvm.org/xenial llvm-toolchain-xenial-8 InRelease [4234 B]
Get:4 http://archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Get:5 http://archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Ign:3 http://apt.llvm.org/xenial llvm-toolchain-xenial-8 InRelease
Get:6 http://apt.llvm.org/xenial llvm-toolchain-xenial-8/main amd64 Packages
[8424 B]
Get:7 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages
[1015 kB]
Get:8 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages [1558 kB]
Get:9 http://security.ubuntu.com/ubuntu xenial-security/restricted amd64
Packages [12.7 kB]
Get:10 http://security.ubuntu.com/ubuntu xenial-security/universe amd64
Packages [594 kB]
Get:11 http://security.ubuntu.com/ubuntu xenial-security/multiverse amd64
Packages [6283 B]
Get:12 http://archive.ubuntu.com/ubuntu xenial/restricted amd64 Packages [14.1
kB]
Get:13 http://archive.ubuntu.com/ubuntu xenial/universe amd64 Packages [9827
kB]
Get:14 http://archive.ubuntu.com/ubuntu xenial/multiverse amd64 Packages [176
kB]
Get:15 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
[1393 kB]
Get:16 http://archive.ubuntu.com/ubuntu xenial-updates/restricted amd64
Packages [13.1 kB]
Get:17 http://archive.ubuntu.com/ubuntu xenial-updates/universe amd64 Packages
[998 kB]
Get:18 http://archive.ubuntu.com/ubuntu xenial-updates/multiverse amd64
Packages [19.3 kB]
Get:19 http://archive.ubuntu.com/ubuntu xenial-backports/main amd64 Packages
[7942 B]
Get:20 http://archive.ubuntu.com/ubuntu xenial-backports/universe amd64
Packages [8807 B]
Fetched 16.2 MB in 2s (6339 kB/s)
Reading package lists...
W: GPG error: http://apt.llvm.org/xenial llvm-toolchain-xenial-8 InRelease: The
following signatures couldn't be verified because the public key is not
available: NO_PUBKEY 15CF4D18AF4F7421
W: The repository 'http://apt.llvm.org/xenial llvm-toolchain-xenial-8
InRelease' is not signed.
Removing intermediate container fbb9e6520558
 ---> 3a75c1f67438
Step 3/3 : RUN apt-get install -y clangd-8 clang-tidy-8
 ---> Running in 80b859553919
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 clangd-8 : Breaks: clang-tools-8 (< 1:8.0.1-1) but
1:8.0.1~svn369350-1~exp1~20190820122438.78 is to be installed
E: Unable to correct problems, you have held broken packages.
The command '/bin/sh -c apt-get install -y clangd-8 clang-tidy-8' returned a
non-zero code: 100
```

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