Re: enable-build-with-cxx bootstrap compare broken by r149964

[Richard Henderson <rth at redhat dot com>]

On 08/21/2009 02:37 PM, Jerry Quinn wrote:
> OK, I've gotten almost this far and can bootstrap (the asterisk is
> actually not the very first char and I have to figure that out).
> However, in the referenced test case, both typeinfos are apparently
> merged, thus returning the same pointer for their name strings, so
> pointer comparison still wouldn't work.
>
> Therefore, I guess I'll need to do the following:
>
> >    You might also need to take steps to ensure that the typeinfo gets emitted
> > as non-COMDAT with local symbols, so that each object does indeed end up with
> > its own separate copy.
>
> Where should I look to do this?

First thing you should do is make sure you're emitting a VAR_DECL
with the string contents, rather than a STRING_CST constant.  The
later will be merged within an object file within the compiler.

Second, make sure the VAR_DECL for the typeinfo is no DECL_ONE_ONLY.
That flag sets up COMDAT sections, which will be merged by the linker.


r~