[llvm-dev] how to access certain kinds of diagnostics from libclang API?

[Craig Topper via llvm-dev]

Adding cfe-dev.

~Craig


On Sat, Feb 15, 2020 at 10:07 PM Andrew Kelley via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Here's an example diagnostic:
>
> andy at ark ~/tmp> clang -c test.c -march=bogus
> error: unknown target CPU 'bogus'
> note: valid target CPU values are: nocona, core2, penryn, bonnell, atom,
>       silvermont, slm, goldmont, goldmont-plus, tremont, nehalem, corei7,
>       westmere, sandybridge, corei7-avx, ivybridge, core-avx-i, haswell,
>       core-avx2, broadwell, skylake, skylake-avx512, skx, cannonlake,
>       icelake-client, icelake-server, knl, knm, k8, athlon64, athlon-fx,
>       opteron, k8-sse3, athlon64-sse3, opteron-sse3, amdfam10, barcelona,
>       btver1, btver2, bdver1, bdver2, bdver3, bdver4, znver1, x86-64
>
>
> When using clang::ASTUnit::LoadFromCommandLine, both the clang::ASTUnit*
> return value and the clang::ASTUnit* ErrAST out parameter are NULL. This
> makes it impossible to access diagnostics with
>
>     if (diags->hasErrorOccurred()) {
>         clang::ASTUnit *unit = ast_unit ? ast_unit : err_unit.release();
>         ZigList<Stage2ErrorMsg> errors = {};
>
>         for (clang::ASTUnit::stored_diag_iterator it =
> unit->stored_diag_begin(),
>              it_end = unit->stored_diag_end(); it != it_end; ++it)
>
>
> whereas for normal C compilation errors, this does work. Is there some
> other way to access the diagnostics?
>
> Here's a downstream issue report with more context:
> https://github.com/ziglang/zig/issues/4455
> See specifically the discussion starting here
> https://github.com/ziglang/zig/issues/3210#issuecomment-586085463 which
> may point to a bug or flaw in libclang's API.
>
> Thanks for the help,
> Andrew
>
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> llvm-dev at lists.llvm.org
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>
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