[cfe-dev] clang -emit-llvm infinite recursion

Chris Lattner clattner at apple.com
Wed Oct 17 17:11:38 PDT 2007

On Oct 17, 2007, at 1:53 PM, Török Edvin wrote:
> Hi,

Hi Török,

> If I run clang on alex.i, with -emit-llvm option I get infinite
> recursion, if I run without it,
> it gives me errors [because struct initializers are not implemented,
> the errors are ok].

Ok, I'll follow up on the -fsyntax-only errors in a separate email.

> I know that struct initializers are not yet implemented (right?), but
> then -emit-llvm should give an error if it can't handle something, and
> not infinite recursion.

The issue in this case is that clang -emit-llvm doesn't handle  
recursive structs at all yet.  Hopefully this should be resolved in  
the next couple weeks.  Right now -emit-llvm is only really useful  
for the most trivial programs.

Devang, we need to add a map to CodeGenTypes to keep track of already  
emitted types, as llvm-gcc does.  This is a little tricky because it  
has to use the PATypeHandle machinery like llvm-gcc.

> I would have used bugpoint to create a reduced testcase, but I don't
> know how to use it with clang, is it possible to use it?

Nope, bugpoint can't handle this.  It should reproduce with something  
like this though:

struct S {
   struct S * F;

struct S x;

> P.S.: I hope you don't misinterpret my mails, I want to help the
> development of clang/llvm by submitting the issues I encounter with
> it. That doesn't mean I don't like clang/llvm ;)

We welcome the help!


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