Re: [gentoo-dev] Re: rfc: news item for png15

[Samuli Suominen <ssuominen@gentoo.org>]

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On 10/14/2011 04:59 AM, Ryan Hill wrote:
> On Fri, 14 Oct 2011 01:01:50 +0300
> Samuli Suominen <ssuominen@gentoo.org> wrote:
> 
>> Title: Upgrade to libpng15
>> Author: Samuli Suominen <ssuominen@gentoo.org>
>> Content-Type: text/plain
>> Posted: 2011-10-14
>> Revision: 1
>> News-Item-Format: 1.0
>> Display-If-Installed: <media-libs/libpng-1.5
>>
>> After upgrading from libpng14 to libpng15 it's important that you rebuild
>> cairo and gdk-pixbuf soon as possible if they are installed.
>                       ^ as
>> Then you can proceed with rebuilding rest of the software against the new
>                                       ^ the 
>> library:
>>
>> # revdep-rebuild --library libpng14.so.14
>>
>> In case of failure, try skipping the failing package and rebuilding it 
>> later in the process.
> 
> How?
>  
>> If you find packages not building with message "ld: cannot find -lpng14",
>                                         ^ the
>> they are likely caused by broken libtool archives (.la) in your system.
>>
>> You can identify those files with following one-liner:
>>
>> # find /usr/ -name '*.la' -exec grep png14 {} +
>>
>> More information and help is available at following forums post:
>                                            ^ the           ^-s?
>>
>> http://forums.gentoo.org/viewtopic-t-894950.html
>>
> 
> 
> 

Attaching draft #2.  I've taken account all the replies so far.  I left
complex one-liners out in _purpose_, and _want to_ people not
understanding the issue to follow up in the forums post.

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Title: Upgrade to libpng15
Author: Samuli Suominen <ssuominen@gentoo.org>
Content-Type: text/plain
Posted: 2011-10-14
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: <media-libs/libpng-1.5

After upgrading from libpng14 to libpng15 it's important that you rebuild
cairo and gdk-pixbuf as soon as possible if they are installed.

Then you can proceed with rebuilding the rest of the software against the new
library:

# revdep-rebuild --library libpng14.so.14 -- --keep-going

Note: It might be necessary to run the previous command more than once.

If you find packages not building with the message "ld: cannot find -lpng14",
they are likely caused by broken libtool archives (.la) in your system.

You can identify those files with following one-liner:

# find /usr/ -name '*.la' -exec grep png14 {} +

Ocne you have identified the broken files, you can either delete them,
edit them in place and replace png14 with png15, or re-emerge the packages
they belong to.

More information and help is available at the following forum post:

http://forums.gentoo.org/viewtopic-t-894950.html