[LLVMdev] bug? c backend produces code rejected by gcc4.0.1: array type has incomplete element type

Bill Wendling
2006-09-20T18:06:34Z

Ignore what I just said. I was looking at the wrong problem...Sorr...

-bw

On 9/20/06, Bill Wendling <isanbard at gmail.com>
wrote:
> It seems very similar to http://llvm.org/bugs/show_bug.cgi?id=737 .
> You might want to check if it's the same problem. If not, then please
> create a new bug report.
>
> -bw
>
> On 9/20/06, Samuele Pedroni <pedronis at strakt.com> wrote:
> > The C backend can currently (recent head) produce code with such
patterns:
> >
> > /* Global Declarations */
> > /* Structure forward decls */
> > struct l_structtype_s;
> >
> > /* Typedefs */
> > typedef struct l_structtype_s l_fixarray_array3[3]; /* problematic
> > declaration */
> > typedef struct l_structtype_s l_structtype_s;
> >
> > /* Structure contents */
> > struct l_structtype_s {
> >   int field0;
> > };
> >
> > gcc 4.0.1 will reject this with
> >
> > example.c:7: error: array type has incomplete element type
> >
> > this kind of code was accepted by previous versions of gcc as a
fragile
> > extension,
> > but is no longer at least in 4.0.1 .
> >
> > is this known? should I file a bug?
> >
> > regards.
> >
> > PS: This code produces such a pattern through llvm-as, and llc
-march=c:
> >
> > target endian = little
> > target pointersize = 32
> > target triple = "i686-apple-darwin8.7.1"
> >
> > %fixarray_array3 = type [3 x %structtype_s]
> > %structtype_s = type { int }
> >
> > int %witness(%fixarray_array3* %p) {
> >      %q = getelementptr %fixarray_array3* %p, uint 0, uint 0, uint 0
> >      %v = load int* %q
> >      ret int %v
> > }
> > _______________________________________________
> > LLVM Developers mailing list
> > LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >
>