Re: [gentoo-user] Getting rid of gcc-4.7.3...how?

[Matti Nykyri]

> On Dec 20, 2014, at 17:56, meino.cramer@×××.de wrote:
>
> Dale <rdalek1967@×××××.com> [14-12-20 02:47]:
>> meino.cramer@×××.de wrote:
>>> Dale <rdalek1967@×××××.com> [14-12-19 17:08]:
>>>> Mick wrote:
>>>>> Meino, to avoid misunderstandings: 1. Emerge the new gcc package. 2.
>>>>> Use gcc-config to change to the new gcc version. 3. Run 'env-update &&
>>>>> source /etc/profile'. 4. Run fix_libtool_files.sh, although I would
>>>>> think that this is redundant these days. 5. Unmerge the old gcc version.
>>>> I don't recall ever running fix_libtool_files.sh after switching gcc
>>>> versions.  Usually when I see a gcc upgrade, I emerge it, switch to it
>>>> and the usual profile thing, run emerge -e world JUST to be safe, then
>>>> unmerge the old gcc.  That's all I usually do here.  I have skipped the
>>>> emerge -e world a time or two.
>>>>
>>>> Am I just lucky, not likely as some may know, or does emerge -e world
>>>> catch it or what?  Now I'm curious.
>>>>
>>>> Dale
>>>>
>>>> :-)  :-)
>>> Hi Dale,
>>>
>>> I started compiling the new gcc this morning about ~7:00 AM...just a
>>> few minutes ago stage3 finishes. Now ... before doing anything else...
>>> I am makeing a backup of all that, so...if anything fails...I am able
>>> to reinstall the status quo.
>>>
>>> I will keep you informed, what happens to my little embedded system...
>>>
>>> Best
>>> Meino
>>
>> That's the thing about slow systems, you want to do it right the first
>> time because it takes to much time to repeat something.  Heck, I have a
>> 4 core AMD CPU with 16GBs of ram here and I still would rather do it
>> right the first time.  If you have something slow that takes days to do
>> something, you really want plan A to work.
>>
>> I'm also wondering if there have been changes to emerge that could make
>> a difference.  I run the latest unstable non *9999 version.  I sorta
>> like having all the new improvements.  I'm just not sure if that affects
>> the issue here is all.
>>
>> Dale
>>
>> :-)  :-)
>
> Hi,
>
> after a few more non-booting-systems and backup-reinstalls I think
> I know whats the reason is...but by I dont know how to get out of it:
>
> The system becomes inaccessible if I do an env-update and reboot.
>
> Reason for that are binaries, in which the path to the old gcc is
> hardcoded. With the sdcard mounted I checked that with my PC:
> I did a
>
>    grep -r '\/usr\/lib\/gcc\/armv7a-hardfloat-linux-gnueabi\/4.7.3'
>
> on ALL files of the sdcard and found "thousands" of hardcoded links
> to the old gcc inside binaries...
>
> The new gcc installed but not doing env-update implies that any
> further compilation will link to the old gcc.
>
> Doing env-update implies a system which will not survive the next
> reboot.
>
> What now?

If i understand your situation correctly, do:

gcc-config "to set the new version"
env-update
logout
login
emerge --deep --update world
emerge --depclean
revdep-rebuild

This will take a long time but will get your system working again. If you don't wan't to do that you can of course tweak the libraries with binary tools. That is easy if you know what you are doing.

To prevent this in the future always before world update, update gcc and glibc first if tere is a new version available. Gcc-config is crusial after you have installed a bew version of gcc.

-- 
-Matti