[cfe-dev] Bug 17824: parse error in typedef union with -fms-extensions

[Jeremy Fitzhardinge]

Hi all,

I filed bug 17824 a few days ago because I'm seeing a regression in the
current svn clang vs previous versions with this structure in glibc's
/usr/include/stdlib.h when compiling with -fms-extensions:

/usr/include/stdlib.h:70:23: error: expected member name or ';' after declaration specifiers
    union wait *__uptr;
    ~~~~~             ^
1 error generated.

The definition in question is:

typedef union
  {
    union wait *__uptr;
    int *__iptr;
  } __WAIT_STATUS __attribute__ ((__transparent_union__));

and just trying to compile this on its own is enough to trigger the bug.
The __attribute__ ((__transparent_union__)) is not a part of the
problem; it can be removed without changing the error.

I thought I'd see if I can make some progress on this myself, but I'm
wondering where to start. I'm poking around in
tools/clang/lib/Parse/ParseDecl.cpp seeing if I can make any headway
here, but I'm wondering if there's some way to dump the (partial?) parse
tree or otherwise see how the parser is progressing?

Thanks,
    J