Re: Horrible compiletimes and memory usage while compiling a parser with X3

On 13/11/2016 9:50 PM, Larry Evans wrote:
> On 11/07/2016 02:44 AM, Peter Gerell wrote:
>> On 07/11/2016 12:38 PM , Joel de Guzman wrote:
>>> On 07/11/2016 1:26 AM, Mikael Asplund wrote:
>>>> This is the reason we're still on 1.60 (with a small
>>>> const-patch from 1.61), since later version have link problems which are just too hard
>>>> to debug.
>>
>>> It would be great if you post a test file that exhibits this problem you mention.
>>> This linking problem doesn't look good and must be fixed.
>>
>> Hi Joel.
>> This is the problem Mikael is referring to.
>> http://melpon.org/wandbox/permlink/X8Awj4wIZ2JqMWIw
>>
>> If KEEP_CHAR is defined the code builds with both boost 1.60 and 1.61.
>> Without KEEP_CHAR it fails with 1.61.
>>
>> The following commit introduced the problem.
>> https://github.com/boostorg/spirit/commit/a8e391bd99dddb3f9ece84bdb1bb9236b0a37cf7
>>
>> The problem seems to be that the attribute types are short-circuited for sequences of one
>> even though we explicitly request a specific binding using FUSION_DEFINE_FOR_STRUCT(ast::Start, count);
> [snip]
>
> More specifically, the change on line 178 causes the
> problem.  That change caused r_pass on line 303 to be
> derived from pass_through_sequence_attribute instead of
> pass_sequence_attribute_front, as was the case with
> boost_1_60_0.  That change, in turn, caused r_attr on line
> 303 to just copy attr, which was type ast::Start, instead of
> the type type of the boost_1_60_0 r_attr which was type
> ast::Count.

[snips]

Just a note that I am not dropping this. I'll find some big chunk of time
to have a deeper look into this and offer some definite solutions.
Unless, of course, if someone beats me to it :-)

Regards,
-- 
Joel de Guzman
http://www.ciere.com
http://boost-spirit.com
http://www.cycfi.com/


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