Clang fail create code model in QtCreator

[nou]

Ubuntu version: Ubuntu 20.04 LTS
QtCreator version: 4.11.0-2build2

After installing Ubuntu 20.04 and QtCreator I can't develop with QtCreator. It print hundred of code errors like incomplete QString class in Q_OBJECT macro or doesn't recognize any Qt class. Buidling the code works and compiler doen't print any errors so this comes from code model plugin in QtCreator.

I found out that qtcreator depends on libclang1-8 but by default it install clang-10 as clang resolve to it. I solved this problem with code model plugin by installing clang-8 which resolved all errors reported by itand now works properly.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: qtcreator 4.11.0-2build2
ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
Uname: Linux 5.4.0-29-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Mon May 11 07:44:55 2020
InstallationDate: Installed on 2020-05-06 (4 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: qtcreator
UpgradeStatus: No upgrade log present (probably fresh install)

[nou (poizl)]

I think this is same problem https://askubuntu.com/questions/1232969/qtcreator-not-recognizing-linked-libraries-after-upgrading-ubuntu-to-20-04

[Launchpad Janitor (janitor)]

This bug was fixed in the package qtcreator - 4.12.4-1

---------------
qtcreator (4.12.4-1) unstable; urgency=medium

  * Team upload.
  * New upstream release.
  * Use the default LLVM/clang Debian versions, rather than hardcoding 8.
    Hopefully qtcreator will properly support newer LLVM versions fast enough.
    (Closes: #966007)
    - switch the libclang-8-dev build dependency to libclang-dev >= 8
    - switch the llvm-8-dev build dependency to llvm-dev >= 8
    - get the LLVM root using llvm-config
  * Switch the generic clang recommend to a dependency of the exact clang-N
    used to build (Closes: #919860, #952718) (LP: #1890434, #1877927)
    - add the clang build dependency to get the used clang executable
  * Drop the Debian man page, as it is outdated, and it offers no useful
    information.
  * Force the version of libqt5designercomponents5 as dependency to be at least
    the same as used during the build. (Closes: #966169)
  * Remove the kate-data suggest, as it does not exist anymore; syntax
    highlighting files are already provided by KF5SyntaxHighlighting.

 -- Pino Toscano <email address hidden> Wed, 19 Aug 2020 19:00:23 +0200