[Bug 279403] typedef redeclaration in base include becoming an issue for DTrace

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279403

Mark Johnston <markj@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |markj@FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Mark Johnston <markj@FreeBSD.org> ---
Has this example ever worked on FreeBSD?

The problem isn't with duplicate typedefs; those are errors in C as well.

In dt_parser.c we have:

1451         /*                                                                 
1452          * If we are nested inside of a C include file, add the
declaration to                                                                  
1453          * the C definition module; otherwise use the D definition module. 
1454          */                                                                
1455         if (yypcb->pcb_idepth != 0)                                        
1456                 dmp = dtp->dt_cdefs;                                       
1457         else                                                               
1458                 dmp = dtp->dt_ddefs;

When we hit the error, we're actually using ddefs instead of cdefs, which is
incorrect according to the comment.  How is pcb_idepth set?  It's adjusted when
we see line control directives emitted by the processor, but it looks like our
version of the D lexer isn't handling this properly somehow.

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