Re: Bug#882490: mips/mipsel: enforce --param ggc-min-expand=10 in dpkg-buildflags

James Cowgill <[email protected]> Mon, 27 Nov 2017 14:03:57 +0000

Newsgroups	gmane.linux.debian.ports.mips
Message-ID	<[email protected]>

Hi,

On 26/11/17 02:41, Guillem Jover wrote:
> Control: tags -1 moreinfo
> 
> [ CCing [email protected] for porters input. ]
> 
> Hi!
> 
> On Thu, 2017-11-23 at 13:59:01 +0100, Mathieu Malaterre wrote:
>> Package: dpkg
>> Version: 1.19.0.4
>> User: [email protected]
>> Usertags: mips mipsel
> 
>> On Thu, Nov 23, 2017 at 1:14 PM, James Cowgill <[email protected]> wrote:
>>> On 23/11/17 11:42, Mathieu Malaterre wrote:
>>>> YunQiang,
>>>>
>>>> Do you know of any drawbacks ?
>>>
>>> This has been raised before:
>>> https://lists.debian.org/debian-mips/2016/10/msg00049.html
>>>
>>> I think it's generally a good idea. You wouldn't want to "enforce" this
>>> - you would set it as an overridable default setting.
>>>
>>> I think the disadvantages are: compilation speed, I think there is no
>>> official way to do this so you would have to hack the gcc source a bit,
>>> and deviation from upstream / other distros.
> 
> Why isn't this considered a buildd issue, lacking enough memory? Or as
> hinted in the discussion, perhaps a leak in gcc?
> 
> If this is gcc on MIPS just requiring more memory, why isn't such
> value set as the default. Which would be overridable with the same
> command-line option?

Usually this is caused by gcc running out of virtual memory on 32-bit
MIPS (which has on 2GB of user vm). IMO this should be fixed in gcc by
adjusting the default values of the ggc-* params on 32-bit MIPS (or even
all 32-bit architectures).

James

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