topic Re: Compiler bug? in Operating System - HP-UX

Compiler bug?

David Layden — Tue, 17 Oct 2000 13:42:47 GMT

We're getting a SIGSEGV signal when accessing large (>256M) bitfield arrays. Writing to the bitfield works fine. Reading fails. The problem exists in cc and aCC, 32-bit and 64-bit. Optimization seems to fix the problem but debug versions always fail.

Any ideas? (see attachment)

Dave

Re: Compiler bug?

Andreas Voss — Tue, 17 Oct 2000 13:51:18 GMT

Hi,

you could try setting:
#pragma HP_ALIGN NOPADDING
into your c source to align your structure.

Regards

Re: Compiler bug?

David Layden — Tue, 17 Oct 2000 14:36:25 GMT

#pragma HP_ALIGN NOPADDING
This works in cc but aCC rejects it.

Dave

Re: Compiler bug?

David Layden — Tue, 17 Oct 2000 14:54:56 GMT

#pragma HP_ALIGN NOPADDING
This doesn't work for other bitfield patterns. For example:

typedef struct {
unsigned int tbits:1 ;
unsigned int ubits:31 ;
} NODE ;

Re: Compiler bug?

Andreas Voss — Tue, 17 Oct 2000 15:12:24 GMT

Hi,

for complete pragma reference look at www.docs.hp.com:
http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/92434-90011/92434-90011_top.html&con=/hpux/onlinedocs/92434-90011/00/00/12-con.html&toc=/hpux/onlinedocs/92434-90011/00/00/12-toc.html&searchterms=pragma&queryid=20001017-091031

Regards