[cfe-dev] Create compile_commands.json directly

[David Butler via cfe-dev]

yes, thanks for highlighting that, I overlooked that in the documentation


On Mon, Dec 27, 2021 at 1:49 PM Csaba Raduly <rcsaba at gmail.com> wrote:
>
> Hi David,
> Are you thinking about -MJ ?
> (https://clang.llvm.org/docs/ClangCommandLineReference.html#dependency-file-generation)
>
> Csaba
>
> On Mon, 27 Dec 2021 at 21:14, David Butler via cfe-dev
> <cfe-dev at lists.llvm.org> wrote:
> >
> > I think it would be really cool if clang could output the
> > compile_commands.json directly, without having to use some
> > extra/external tool (like bear/ninja…) so, like what do people think
> > about a patch that that took a .json file as input, and would update
> > with the current job? The idea would be that this would be a good fit
> > for small scale usage…
> >
> > Perhaps a bit more engineered solution would be to embed all the
> > needed information as debug info in the object file, and then the
> > linker does the work of updating any compile_commands.json files?
> >
> > Or maybe another thing that could be done is something like the -MD
> > option, where a bunch of individual files get made for each
> > invocation, and then, later, a compile_commands.json file can be made
> > by concatenating all the individual files together…
> >
> > Anyway, I’m looking forward to hearing other people’s thoughts on this
> >
> > Also, I wasn't sure what was the best forum for this discussion, so I
> > have copied this here:
> > https://llvm.discourse.group/t/create-compile-commands-json-directly/5063
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> > cfe-dev at lists.llvm.org
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>
>
>
> --
> You can get very substantial performance improvements
> by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
> So if you're looking for a completely portable, 100% standards-conformant way
> to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK)