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Date: Mon, 18 Mar 2024 18:43:18 +0000
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Subject: Re: Cannot downgrade gcc 13 or 12 to 11.4.0-1
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To: thomas AT hedden DOT org
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From: Jon Turney via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
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On 14/03/2024 18:34, Thomas Hedden via Cygwin wrote:
> I installed a test version of gcc and cannot revert to an earlier, 
> non-test version. Here are the latest versions listed in the setup routine:
> 
> 11.4.0-1
> 12.3.1+20240202-0.1 (Test)
> 13.2.1+20240203-0.1 (Test)
> 
> (there are some even older ones, but I want 11.4.0-1.)
> 
> $ gcc --version
> gcc (GCC) 13.2.1 20240203
[...]
> $ gcc -o hello.exe hello.c
> /usr/lib/gcc/x86_64-pc-cygwin/13/../../../../x86_64-pc-cygwin/bin/ld: 
> cannot find -lintl: No such file or directory
> /usr/lib/gcc/x86_64-pc-cygwin/13/../../../../x86_64-pc-cygwin/bin/ld: 
> cannot find -liconv: No such file or directory
> collect2: error: ld returned 1 exit status

This seems like a problem with this test version of gcc.  I guess maybe 
it now links with intl and iconv by default in the specsfile, which will 
require the corresponding devel packages to be installed, but it doesn't 
depend on them.

This seems like a mistake. (I think libstdc++ will now require these, 
but they shouldn't be needed just for c compilation.)

> So, I can't compile anything. I don't need the test version to work, I 
> just want to downgrade to 11.4.0-1. However, if I uninstall the test 
> version, and then try to install 11.4.0-1, I get the following message:
> 
> Problem 1/1
> package gcc-g++-11.4.0-1 requires gcc11, but none of the providers can 
> be installed
> Solution 1/2
>    - allow replacement of gcc-core-13.2.1+20240203-0.1 with 
> gcc-core-11.4.0-1
> Solution 2/2 (default)
>    - do not ask to lock gcc-g++-11.4.0-1
> 
> What should I do?

Sorry that this message isn't very clear, and this situation is not 
handled well by setup.

You need to downgrade all the various gcc packages in step.

Which you can do manually, but perhaps the easiest way to do this is to 
select the 'Sync' option at the top-right, which will downgrade all test 
packages.


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