[gentoo-user] unexpected problems when switching c compilers

[gentoo-user] unexpected problems when switching c compilers

[John Covici]

Hi.  I finally decided to switch the c compiler from 4.9.3 to 5.3.0
and ran into some strange problems.  Although the kernel compiled
successfully, several packages in my last update of world got
undefined references, one of which was mktoolnix and also mpv.  Now I
did solve them by re-emerging the packages containing the references
and that fix things, although I had to do it in stages, getting past
one and finding another one.

So, my question is, is there away to fix this throuought /usr/lib
without having to re-emerge world or something, or do I just wait and
take them one at a time during future updates?

Thanks in advance for any suggestions.

-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici
         covici@ccs.covici.com

Re: [gentoo-user] unexpected problems when switching c compilers

[Miroslav Rovis]

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On 161025-12:02-0400, John Covici wrote:
> Hi.  I finally decided to switch the c compiler from 4.9.3 to 5.3.0
> and ran into some strange problems.  Although the kernel compiled
> successfully, several packages in my last update of world got
> undefined references, one of which was mktoolnix and also mpv.  Now I
> did solve them by re-emerging the packages containing the references
> and that fix things, although I had to do it in stages, getting past
> one and finding another one.
> 
> So, my question is, is there away to fix this throuought /usr/lib
> without having to re-emerge world or something, or do I just wait and
> take them one at a time during future updates?
> 
> Thanks in advance for any suggestions.

I've been using the 5.x since long months, since I'm on ~amd64. I
remember vaguely there was an item in the eselect news about it, and
links there and things. It should still be in your news list.

Regards!
-- 
Miroslav Rovis
Zagreb, Croatia
http://www.CroatiaFidelis.hr

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Re: [gentoo-user] unexpected problems when switching c compilers

[Mickaël Bucas]

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2016-10-25 20:02 GMT+02:00 Miroslav Rovis <miro.rovis@croatiafidelis.hr>:

> On 161025-12:02-0400, John Covici wrote:
> > Hi.  I finally decided to switch the c compiler from 4.9.3 to 5.3.0
> > and ran into some strange problems.  Although the kernel compiled
> > successfully, several packages in my last update of world got
> > undefined references, one of which was mktoolnix and also mpv.  Now I
> > did solve them by re-emerging the packages containing the references
> > and that fix things, although I had to do it in stages, getting past
> > one and finding another one.
> >
> > So, my question is, is there away to fix this throuought /usr/lib
> > without having to re-emerge world or something, or do I just wait and
> > take them one at a time during future updates?
> >
> > Thanks in advance for any suggestions.
>
> I've been using the 5.x since long months, since I'm on ~amd64. I
> remember vaguely there was an item in the eselect news about it, and
> links there and things. It should still be in your news list.
>

There was probably an Application Binary Interface change between the 2
compilers, for example [1]
The news from portage [2] explain how to use revdep-rebuild

All I know about these problems, I've learn from Diego Petteno's blog [3]
and the articles about Application Binary Interface
I've myself encountered this kind of problem even between minor versions of
GCC when the C++11 ABI was not stable.

I think you have some happy compiling ahead !

Best regards
Mickaël Bucas

[1] https://gcc.gnu.org/onlinedocs/libstdc%2B%2B/manual/using_dual_abi.html
[2]
https://www.gentoo.org/support/news-items/2015-10-22-gcc-5-new-c++11-abi.html
[3] https://blog.flameeyes.eu/2010/09/your-worst-enemy-undefined-symbols/

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Re: [gentoo-user] unexpected problems when switching c compilers

[John Covici]

On Tue, 25 Oct 2016 16:45:22 -0400,
Mickaël Bucas wrote:
> 
> [1  <text/plain; UTF-8 (quoted-printable)>]
> [2  <text/html; UTF-8 (quoted-printable)>]
> 2016-10-25 20:02 GMT+02:00 Miroslav Rovis <miro.rovis@croatiafidelis.hr>:
> 
>  On 161025-12:02-0400, John Covici wrote:
>  > Hi.  I finally decided to switch the c compiler from 4.9.3 to 5.3.0
>  > and ran into some strange problems.  Although the kernel compiled
>  > successfully, several packages in my last update of world got
>  > undefined references, one of which was mktoolnix and also mpv.  Now I
>  > did solve them by re-emerging the packages containing the references
>  > and that fix things, although I had to do it in stages, getting past
>  > one and finding another one.
>  >
>  > So, my question is, is there away to fix this throuought /usr/lib
>  > without having to re-emerge world or something, or do I just wait and
>  > take them one at a time during future updates?
>  >
>  > Thanks in advance for any suggestions.
> 
>  I've been using the 5.x since long months, since I'm on ~amd64. I
>  remember vaguely there was an item in the eselect news about it, and
>  links there and things. It should still be in your news list.
> 
> There was probably an Application Binary Interface change between the 2 compilers, for example [1]
> The news from portage [2] explain how to use revdep-rebuild
> 
> All I know about these problems, I've learn from Diego Petteno's blog [3] and the articles about Application Binary Interface
> I've myself encountered this kind of problem even between minor versions of GCC when the C++11 ABI was not stable.
> 
> I think you have some happy compiling ahead !
> 
> Best regards
> Mickaël Bucas

Thanks, I will check the news item and see what happens.

-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici
         covici@ccs.covici.com