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JenyaKh
n00b
Joined: 07 Apr 2017
Posts: 9
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 Posted: Thu Apr 20, 2017 4:11 pm Post subject: Update of a package whose version was explicitly specified |
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I have had stable gcc-4.9.4. Today emerge world installed the new gcc-5.4.0-r3 into another slot. However, I'm not ready to switch to the new version completely and I decided to keep both packages. I hoped that as the two versions are installed in different slots, emerge -c will not remove the older version gcc-4.9.4. However, emerge -c did offer to remove it.
So I tried the workaround. I installed the two versions explicitly:
sudo emerge =sys-devel/gcc-4.9.4
sudo emerge =sys-devel/gcc-5.4.0-r3
It worked. Now emerge -c does not offer to remove any gcc versions from my system.
However, I worry if the solution is good. Will portage offer me to emerge the newer version of gcc (I mean a stable version newer than 5.4.0-r3) when it appears in gentoo repo? If it offers me to install the newer version will emerge -c offers me to remove then older gcc-4.9.4 and gcc-5.4.0-r3 versions or will I have to remember of them and remove them manually?
I mean when I install a package not specifying a particular version, it all works automatically: portage finds a newer version by itself and allow to remove the older one. But if I specify a version when emerging a package it looks like masking but I don't understand how to consequently control the masking and the package updates.
Could you, please, explain the moment? |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54237
Location: 56N 3W
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| Posted: Thu Apr 20, 2017 4:18 pm Post subject: |
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JenyaKh,
Your world file will contain both gcc versions because they have been explicitly installed.
You will still get gcc updates.
Due to the C++ ABI change between gcc-4 and gcc-5, the update is non-trivial. Read your news items.
You cannot mix C++ code built with gcc-4 and gcc-5.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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JenyaKh
n00b
Joined: 07 Apr 2017
Posts: 9
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| Posted: Thu Apr 20, 2017 4:26 pm Post subject: |
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| NeddySeagoon wrote: | JenyaKh,
Your world file will contain both gcc versions because they have been explicitly installed.
You will still get gcc updates.
Due to the C++ ABI change between gcc-4 and gcc-5, the update is non-trivial. Read your news items.
You cannot mix C++ code built with gcc-4 and gcc-5. |
NeddySeagoon,
If I'm not mistaken my world file contains just the line
sys-devel/gcc
without any versions. Though right now I'm not near my gentoo machine and I will check this tomorrow.
I know about the ABI changes. I read my news items. I wrote that I just want to keep the two packets -- not to use them at the same time. When I have time I will try to switch to the newer version.
My question is particularly about how will the updates of the two versions in the two different slots happen so I asked:
"... when I install a package not specifying a particular version, it all works automatically: portage finds a newer version by itself and allow to remove the older one. But if I specify a version when emerging a package it looks like masking but I don't understand how to consequently control the masking and the package updates" |
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JenyaKh
n00b
Joined: 07 Apr 2017
Posts: 9
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| Posted: Fri Apr 21, 2017 3:10 am Post subject: |
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| NeddySeagoon wrote: | JenyaKh,
Your world file will contain both gcc versions because they have been explicitly installed.
You will still get gcc updates.
Due to the C++ ABI change between gcc-4 and gcc-5, the update is non-trivial. Read your news items.
You cannot mix C++ code built with gcc-4 and gcc-5. |
I checked my world file. Indeed, you have been right. I have the two entries there:
sys-devel/gcc:4.9.4
sys-devel/gcc:5.4.0
That explains much. Thank you, NeddySeagoon. However, still I'm not quite sure about their updates. If I understand right I will have to control it and the removal of the older packages by myself. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54237
Location: 56N 3W
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| Posted: Fri Apr 21, 2017 8:35 am Post subject: |
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JenyaKh,
It depends on the slotting. The easy part is that --depclean will not remove sys-devel/gcc:4.9.4 and sys-devel/gcc:5.4.0
| Code: | emerge =sys-devel/gcc-4.9.4 =sys-devel/gcc-5.4.0-r3 -pv
sys-devel/gcc-5.4.0-r3:5.4.0::gentoo
sys-devel/gcc-4.9.4:4.9.4::gentoo |
You read those lines as <category>/<package>-<version>:<slot>::>repository>
So the slots are 5.4.0 and 4.9.4. If there were -rX updates those updates go in the same slots, so yould would get those. Updates.
If there was a 5.4.x. It would go into its own slot too.
Notice your world file has a colon (:) seperator, not a dash (-), so the gcc entries are <category>/<package>:<slot>, not <category>/<package>-<version>.
This means that if you ever got, gcc-4.9.4, gcc-5.4.0, gcc-5.4.3 and gcc-5.4.5 installed, then ran --depcleen,
gcc-4.9.4, gcc-5.4.0 would remain as they are in world.
gcc-5.4.3 would be removed.
gcc-5.4.5 would remain as its the highest version.
Note that gcc-5.4.3 and gcc-5.4.5 don't exist today.
If the slots were 4 and 5, then its more complex. A slot holds a single installed version. All versions of gcc-4.x.y would go in slot 4.
I manage gcc with --depclean --exclude=sys-devel/gcc so that depclean ignores gcc.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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toralf
Developer
Joined: 01 Feb 2004
Posts: 3922
Location: Hamburg
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| Posted: Fri Apr 21, 2017 9:21 am Post subject: |
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BTW: | Code: | | emerge --noreplace <package> |
is what you should consider to use. |
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JenyaKh
n00b
Joined: 07 Apr 2017
Posts: 9
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| Posted: Fri Apr 21, 2017 10:48 am Post subject: |
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| NeddySeagoon wrote: | JenyaKh,
It depends on the slotting. The easy part is that --depclean will not remove sys-devel/gcc:4.9.4 and sys-devel/gcc:5.4.0
| Code: | emerge =sys-devel/gcc-4.9.4 =sys-devel/gcc-5.4.0-r3 -pv
sys-devel/gcc-5.4.0-r3:5.4.0::gentoo
sys-devel/gcc-4.9.4:4.9.4::gentoo |
You read those lines as <category>/<package>-<version>:<slot>::>repository>
So the slots are 5.4.0 and 4.9.4. If there were -rX updates those updates go in the same slots, so yould would get those. Updates.
If there was a 5.4.x. It would go into its own slot too.
Notice your world file has a colon ( seperator, not a dash (-), so the gcc entries are <category>/<package>:<slot>, not <category>/<package>-<version>.
This means that if you ever got, gcc-4.9.4, gcc-5.4.0, gcc-5.4.3 and gcc-5.4.5 installed, then ran --depcleen,
gcc-4.9.4, gcc-5.4.0 would remain as they are in world.
gcc-5.4.3 would be removed.
gcc-5.4.5 would remain as its the highest version.
Note that gcc-5.4.3 and gcc-5.4.5 don't exist today.
If the slots were 4 and 5, then its more complex. A slot holds a single installed version. All versions of gcc-4.x.y would go in slot 4.
I manage gcc with --depclean --exclude=sys-devel/gcc so that depclean ignores gcc. |
NeddySeagoon, Thank you very much for the detailed explanation!!! Especially that you have pointed out to me that it's slots that are used in world file rather than versions. |
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