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

[Mats Wichmann]

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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