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Hey all,

I want to scratch my own itch by fixing the issue that clang_getCanonicalTy=
pe=20
does not deduce the type for variables such as `auto i =3D 1;`. See for con=
text:

https://llvm.org/bugs/show_bug.cgi?id=3D18669
http://clang-developers.42468.n3.nabble.com/API-for-auto-type-deduction-in-=
libclang-td4037350.html

I added a simple unit test as the first step:

    $ cat test/Index/cxx11-print-type.cpp
    auto a =3D 1;

    // RUN: c-index-test -test-print-type -std=3Dc++11 %s | FileCheck %s
    // CHECK: VarDecl=3Da:1:6 [type=3Dauto] [typeKind=3DUnexposed]
    [canonicaltype=3Dint] [canonicaltypekind=3DInt] [isPOD=3D1]

Running the first half manually I get:

    VarDecl=3Da:1:6 (Definition) [type=3Dauto] [typekind=3DUnexposed] [isPO=
D=3D0]

Sadly, I'm a bit lost as to where I'd have to fix this. Looking at=20
CXType.cpp's clang_getCanonicalType implementation, I tried something like=
=20
this:

    fprintf(stderr, "--------------> undeduced?: %d\n", T->isUndeducedType(=
));
    if (T->isUndeducedType()) {
      auto d =3D T->getContainedAutoType()->getDeducedType();
      fprintf(stderr, "--------------> deduced valid? %d\n", !d.isNull());
      if (!d.isNull()) {
        T =3D d;
      }
    }
=20
This shows me that for the above input (i.e. `auto i =3D 1;`), the type is=
=20
undeduced, but I also cannot force deduction by getDeducedType (probably me=
=20
abusing/misinterpreting the API). So what can be done here - how could it b=
e=20
fixed? Where would it be fixed?

Thanks

=2D-=20
Milian Wolff
mail@milianw.de
http://milianw.de
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