[cfe-dev] Fwd: warnings and error messages always go to standard error

[Geoff Levner via cfe-dev]

Aha! Thank you very much, Eli. That does the trick.

[Actually, though, you have to pass createDiagnostics() a
DiagnosticConsumer, which in my case is my TextDiagnosticPrinter.]

Geoff

On Tue, 28 Aug 2018 at 22:03, Friedman, Eli <efriedma at codeaurora.org> wrote:

> On 8/28/2018 12:51 PM, Geoff Levner via cfe-dev wrote:
>
> Greetings, clangspeople,
>
> We are using Clang and LLVM in an application to compile and execute C++
> code on the fly. If the code fails to compile, I would like to be able to
> pop up a dialog box telling the user why. But warnings and error messages
> go straight to standard error.
>
> I have tried passing a raw_string_ostream to TextDiagnosticPrinter instead
> of errs(), but that seems to have no effect. What is that stream actually
> used for? Am I doing something wrong? I have attached the code we use to
> compile (simplified a bit).
>
>
> The DiagnosticsEngine you pass to the Driver is only used for diagnostics
> from the driver itself, not the resulting compilation.
>
> createDiagnostics() takes a DiagnosticsEngine as a parameter.  (If you
> don't explicitly pass one, it will create one for you, which prints
> diagnostics to stderr.)
>
> -Eli
>
> --
> Employee of Qualcomm Innovation Center, Inc.
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>
>
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