[GCC-XML] internal error with 0.9.0

Steve Vinoski vinoski at ieee.org
Thu Feb 14 13:47:37 EST 2008

On 2/14/08, Brad King <brad.king at kitware.com> wrote:
> Steve Vinoski wrote:
>  > Right, debugging gccxml_cc1plus instead of gccxml let me hit the
>  > breakpoint, but I didn't get very far after that. I'm not very
>  > familiar with the innards of gcc, so debugging it is not easy.
>  >
>  > But given that g++ 4.2 doesn't have any issues with that code, I
>  > thought maybe I could look through recent gcc patches to find the fix.
>  > I looked through a number of patches and also through the gcc sources
>  > a fair bit, but so far, no luck.
> I found the problem.  It is in fact a bug in GCC 4.2's mangle.c but it
>  is exposed only by GCC-XML's call to it.  Somehow mangle.c reaches a
>  case where it assumes that an enumeration value will be a simple integer
>  expression when in your example it is a less-than-comparison expression.

Well, at least I was looking at the right place -- mangle.c seemed to
be the culprit, but I couldn't narrow it down from there due to my
ignorance of the compiler internals. :-)

>  I've committed a hack to work around the issue:
>  /cvsroot/GCC_XML/gccxml/GCC/gcc/cp/mangle.c,v  <--  mangle.c
>  new revision: 1.3; previous revision: 1.2

I picked that up and verified that it works. Thanks!


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