[cfe-dev] Getting past error: member access into incomplete type

[Manuel Klimek]

On Sun, Sep 2, 2012 at 10:51 PM, Eric Schulte <eric.schulte at gmx.com> wrote:
> Matthieu Monrocq <matthieu.monrocq at gmail.com> writes:
>
>> On Sun, Sep 2, 2012 at 8:04 AM, James Dennett <james.dennett at gmail.com>wrote:
>>
>>> On Sat, Sep 1, 2012 at 6:14 PM, Eric Schulte <eric.schulte at gmx.com> wrote:
>>> > Hi,
>>> >
>>> > I'm working on a small AST-manipulation tool built upon clang [1].  I
>>> > had an implementation which worked but didn't deal well with included
>>> > headings.  I've since re-written this using the Tooling interface,
>>> > however using the example code from [2] I run into the following "member
>>> > access into incomplete type" error on an ASTContext [3].
>>> >
>>> > It looks like I could solve this error by stepping back to previous
>>> > versions of clang and llvm [4], but I'd prefer to fix this so that it
>>> > works with the current code and moving forward.  The broken file is at,
>>> > https://github.com/eschulte/clang-mutate/blob/master/mutate-tool.cpp
>>> >
>>> > Any suggestions would be greatly appreciated.
>>>
>>> If I'm reading this correctly, your code just needs to #include the
>>> definition of the ASTContext class (from
>>> include/clang/AST/ASTContext.h) in order to refer to a member of
>>> ASTContext (e.g., "Context.getTranslationUnitDecl()").
>>>
>>> -- James
>>>
>>>
>> I agree with James.
>>
>> There has been refactoring on the headers in the AST and Sema (I think) to
>> move from direct inclusion to forward declaration which probably broke a
>> few clients that relied on the inclusions being done for them. Normally if
>> you would just make the inclusion yourself now, it should work as before.
>>
>> -- Matthieu
>
> Thanks,
>
> Having added the ASTContext include directive (and copied some linking
> behavior from tools distributed with clang) I'm now compiling
> successfully.
>
> However it seems that some more work will be required to inform clang's
> search for included files.  When running on a simple hello world example
> file which includes stdio.h, clang tools run without problem, e.g.,
>
>     $ clang hello.c
>     $ clang-check hello.c
>     Processing: /home/eschulte/src/clang-mutate/hello.c.
>
> however my tool (using the Tooling interface) results in the following.
>
>     $ ./clang-mutate n hello.c
>     numbering
>     Processing: /home/eschulte/src/clang-mutate/hello.c.
>     In file included from /home/eschulte/src/clang-mutate/hello.c:1:
>     /usr/include/stdio.h:33:11: fatal error: 'stddef.h' file not found
>     # include <stddef.h>
>               ^
>     Stack dump:
>     0.      <eof> parser at end of file
>     zsh: segmentation fault  ./clang-mutate n hello.c
>
> Any ideas what could be going wrong here?  FWIW all of this code is
> available at https://github.com/eschulte/clang-mutate, and the above
> error can be demonstrated by running "make check".

The tool needs to find the builtin include directory.

See http://clang.llvm.org/docs/LibTooling.html#builtin

Cheers,
/Manuel

>
> Thanks,
>
> --
> Eric Schulte
> http://cs.unm.edu/~eschulte
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