[Scons-dev] Looking for help mapping Windows pdb semantics to SCons

[Bill Deegan]

Mats,

What builders can't you cache?

-Bill

On Fri, May 24, 2019 at 3:56 PM Mats Wichmann <mats at wichmann.us> wrote:

> For all you guys, is the current caching - all filesystem based - useful
> enough? I've been chewing on a network based extension, for all those
> disposable builders that don't really have great ways to cache
>
>
> On May 24, 2019 3:45:01 PM MDT, "Andrew C. Morrow" <
> andrew.c.morrow at gmail.com> wrote:
>>
>>
>> Hi Adam -
>>
>> I'm working in this same area (caching and debug info handling) for the
>> SCons based MongoDB build system, right now.
>>
>> Overall, I am trying to move to a model on Windows that is more like
>> using -gsplit-dwarf with the GNU tools, where every object file gets a
>> (cacheable) .pdb, and then we link with /DEBUG:fastlink, and defer the
>> final per library/executable PDB to a post link step by using mspdbcmf.
>> This is similar to using dwp to package up the .dwo files.
>>
>> You can see some of my very much work-in-progress state here:
>> https://github.com/acmorrow/mongo/blob/SERVER-33661/site_scons/site_tools/separate_debug.py
>>
>> Unfortunately, I've encountered one showstopper issue for us:
>> https://developercommunity.visualstudio.com/content/problem/573023/absolute-paths-for-associated-pdb-files-are-record.html,
>> and I'm waiting to hear back on it.
>>
>> The next steps in my current approach would be to move the actions that
>> produce the finalized .dwp, .dSYM, or .pdb file into separate builders,
>> rather than adding them as actions to the .Program and .SharedLibrary
>> builders. That would allow the build tasks to finalize the debug
>> information to be executed separately, or not at all for developer builds
>> where keeping the debug info in separated per-object files is sufficient.
>>
>> If you are interested, I'd be happy to collaborate (off-list initially?)
>> to discuss some of the issues we have encountered and find a way to avoid
>> duplication of effort. Improving the debug info handling situation is
>> something I'm keenly interested in, as it is a major bottleneck in our
>> build performance.
>>
>> Thanks,
>> Andrew
>>
>>
>>
>> On Fri, May 24, 2019 at 3:45 PM Tomasz Gajewski <tomga at wp.pl> wrote:
>>
>>>
>>> Adam Gross via Scons-dev <scons-dev at scons.org> writes:
>>>
>>> > I am investigating better supporting caching with SCons at VMware and
>>> > am trying to see if I can teach SCons about pdb files.
>>>
>>> Is there any problem for your use cases in using /Z7 option for
>>> compilation? That tells the compiler to embed debug data in .obj file
>>> like on linux. Then during linking pdb's are created. It works at least
>>> for shared libraries and executables.
>>>
>>> Regards
>>> Tomasz Gajewski
>>>
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>>>
>>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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