Re: [gentoo-user] Upgrading gcc from 6.4 to 7.3

[gevisz <gevisz@gmail.com>]

2018-06-20 15:49 GMT+03:00 gevisz <gevisz@gmail.com>:
> 2018-06-20 15:01 GMT+03:00 gevisz <gevisz@gmail.com>:
>> 2018-06-20 14:16 GMT+03:00 Mick <michaelkintzios@gmail.com>:
>>> On Wednesday, 20 June 2018 11:43:32 BST gevisz wrote:
>>>> After updating portage tree today, portage
>>>> suggested to upgrade gcc from 6.4 to 7.3
>>>> version what I have done just now.
>>>>
>>>> Nevertheless,
>>>> # gcc-config --list-profiles
>>>>  [1] x86_64-pc-linux-gnu-6.4.0 *
>>>>  [2] x86_64-pc-linux-gnu-7.3.0
>>>> shows that I still have version 6.4 as a default.
>>>
>>> I'm on gcc-7.3.0-r3 and have not noticed any problems on 3 boxen so far.
>>>
>>>
>>>> As https://wiki.gentoo.org/wiki/Upgrading_GCC
>>>> still do not have any specific instructions on
>>>> switching to gcc version 7.3, I am still afread
>>>> of switching to gcc version 7.3 and would like
>>>> to ask if anybody encountered some problem
>>>> after switching to gcc version 7.3 and which
>>>> packages should be rebuild after such switching.
>>>>
>>>> Thank you in advance for your help.
>>>
>>> I didn't have to rebuild anything, but if you have reasons to fear breakage
>>> you can rebuild your toolchain:
>>>
>>> 1. Use gcc-config to select x86_64-pc-linux-gnu-7.3.0
>>> 2. Re-source /etc/profile by running in your current console/terminal:
>>>     . /etc/profile
>>> 3. Re-emerge libtool:
>>>     emerge -1 sys-devel/libtool
>>> 4. Re-emerge the following packages in this order:
>>>     emerge -1 sys-devel/gcc-7.3.0-r3
>>>     emerge -1 sys-devel/binutils
>>>     emerge -1 sys-libs/glibc
>>> 5. You could if you want re-emerge your entire system, 'emerge -e @world' or
>>> if you would rather conserve electricity wait as different packages come up
>>> for an update over time.
>>>
>>> If my experience to date holds true and for a general purpose desktop none of
>>> the above rebuilds are necessary, other than switching your gcc to 7.3.0.
>>
>> Thank you for your reply. I do not want to rebuild gcc-7.3 for the second time
>> today (as far as the temperature in my room is already +30°C). So, I will stick
>> to your last advice: I will just switch the default gcc version to 7.3
>> and wait for problems to appear. :)
>
> Just have rebuilt libtool and llvm, to have less problems. :)

Just today vlc failed to compile because libebml have been compiled
with gcc-6.4.0.
(Thanks to Alexander Kapshuk for the tip.)

So, libebml should be added to the list of packages that have to be
recompiled with gcc-7.3
(namely, to libtool and llvm), and recompiling everything twice after
updating major version
of gcc does not seem to be so bad idea for me any more. :)