[cfe-dev] How to assign a Custom Diagnostic IDs in Clang Tool

[Don Hinton via cfe-dev]

Are you trying to put the actual numerical value in the documentation?
That won't work since it's based on the enum value that gets computed at
compile time -- actually via tablegen -- and changes over time as
diagnostics are added/removed.

Tooling may already do this, but if not, just create your own enum that
starts at the first available value, clang::diag::DIAG_UPPER_LIMIT, and go
from there.  Then you can publish and use those enum values, e.g.,
MyTool::Some_Diag.  Take a look at how new id numbers are generated and use
the same technique, e.g.:

  https://clang.llvm.org/doxygen/DiagnosticIDs_8cpp_source.html#l00291).

If you need a string you can pass on the command line, you can create your
own mapping.

hth...
don


On Thu, Feb 1, 2018 at 1:12 PM, Roman Popov via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Looks like DiagnosticEngine does not allow to be instantiated with
> User-supplied IDs.
> The problem is that DiagnosticIDs is not an interface to IDs database, but
> rather a final class not designed for inheritance.
>
> So I don't find a way how Clang diagnostic library can be reused by 3rd
> party tool.
>
> 2018-02-01 12:10 GMT-08:00 Roman Popov <ripopov at gmail.com>:
>
>> Hello,
>> I want to create a fixed sets of IDs for error messages in Clang tool. So
>> I can put them into tool documentation.
>>
>> Is it possible to somehow assign a fixed ID for diagnostic?
>> DiagnosticEngine::getCustomDiagID() generates ID automatically, so I
>> have no control on IDs.
>>
>> Should I probably instantiate my own DiagnosticEngine instead of using
>> one from AstContext ?
>>
>> Thanks,
>> Roman
>>
>
>
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