Score:0

How to safely downgrade gcc from 8.5 to 8.4?

eg flag

I have a CentOS Stream 8 server with a backup application that requires the kernel to be compiled with the same version of gcc. Latest kernel is: 4.18.0-408.el8.x86_64

I inadvertently updated gcc in the course of doing updates, and it's currently: gcc version 8.5.0 20210514 (Red Hat 8.5.0-15) (GCC)

gcc 8.5 was apparently backported from CentOS Stream 9 into 8, and that's causing problems for me.

I need to downgrade gcc to 8.4, which is available. Of course when I try, I get the following errors:

]# dnf install gcc-8.4.1-1.el8.x86_64
Last metadata expiration check: 0:09:42 ago on Fri 28 Oct 2022 12:15:53 AM PDT.
Error:
 Problem: problem with installed package gcc-plugin-annobin-8.5.0-15.el8.x86_64
  - package gcc-plugin-annobin-8.5.0-15.el8.x86_64 requires gcc = 8.5.0-15.el8, but none of the providers can be installed
  - package gcc-plugin-annobin-8.5.0-13.el8.x86_64 requires gcc = 8.5.0-13.el8, but none of the providers can be installed
  - package gcc-plugin-annobin-8.5.0-14.el8.x86_64 requires gcc = 8.5.0-14.el8, but none of the providers can be installed
  - cannot install both gcc-8.4.1-1.el8.x86_64 and gcc-8.5.0-15.el8.x86_64
  - cannot install both gcc-8.5.0-13.el8.x86_64 and gcc-8.4.1-1.el8.x86_64
  - cannot install both gcc-8.5.0-14.el8.x86_64 and gcc-8.4.1-1.el8.x86_64
  - cannot install both gcc-8.5.0-15.el8.x86_64 and gcc-8.4.1-1.el8.x86_64
  - conflicting requests
(try to add '--allowerasing' to command line to replace conflicting packages or '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)
]# dnf remove gcc
Dependencies resolved.
===========================================================================================================================================================================
 Package                                           Architecture                      Version                                   Repository                             Size
===========================================================================================================================================================================
Removing:
 gcc                                               x86_64                            8.5.0-15.el8                              @appstream                             59 M
Removing dependent packages:
 BackupAndRecoveryAgent                            x86_64                            15.0.30430-1                              @System                               933 M
 annobin                                           x86_64                            10.67-3.el8                               @appstream                            968 k
 dkms                                              noarch                            3.0.7-1.el8                               @epel                                 151 k
 file_protector                                    noarch                            1.1-1497                                  @System                               8.3 M
 gcc-plugin-annobin                                x86_64                            8.5.0-15.el8                              @appstream                             48 k
 snapapi26_modules                                 noarch                            0.8.15-1                                  @System                               5.2 M
Removing unused dependencies:
 cpp                                               x86_64                            8.5.0-15.el8                              @appstream                             28 M
 glibc-devel                                       x86_64                            2.28-214.el8                              @baseos                               234 k
 glibc-headers                                     x86_64                            2.28-214.el8                              @baseos                               1.9 M
 isl                                               x86_64                            0.16.1-6.el8                              @AppStream                            3.1 M
 kernel-headers                                    x86_64                            4.18.0-408.el8                            @baseos                               5.2 M
 libmpc                                            x86_64                            1.1.0-9.1.el8                             @appstream                            124 k
 libxcrypt-devel                                   x86_64                            4.1.1-6.el8                               @baseos                                24 k

Transaction Summary
===========================================================================================================================================================================
Remove  14 Packages

Should I do dnf remove gcc-plugin-annobin and dnf install gcc-8.4.1-1.el8.x86_64 --skip-broken? Will everything fall into place once 8.4 is installed? Or should I remove gcc and gcc-plugin-annobin and install the version I need?

I just want to be cautious so nothing breaks.

Thank you.

Martin avatar
kz flag
dnf has a downgrade command - did you try `dnf downgrade gcc` ?
location avatar
eg flag
After I downgrade a couple of times, I am at gcc-8.5.0-13.el8.x86_64, and it gives me an error very similar to the one I posted above: Problem: problem with installed package gcc-plugin-annobin-8.5.0-13.el8.x86_64 - package gcc-plugin-annobin-8.5.0-13.el8.x86_64 requires gcc = 8.5.0-13.el8, but none of the providers can be installed etc etc
Martin avatar
kz flag
I just realized that you are on CentOS stream ... unlike other distributions, this is more like a rolling release than a stable distribution - which makes it unsuitable for your needs, since you require a specific version of the gcc compiler. So either you have to install gcc manually, or you have to switch the distribution you are working on...
location avatar
eg flag
You're right, I have some other issues due to what you mention. Also, I was able to install the gcc version I need.
Score:0
eg flag

I was able to fix the problem by using --allowerasing

]# dnf install gcc-8.4.1-1.el8.x86_64 --allowerasing removed gcc 8.5 and installed 8.4

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