kern/102424: [libc] printf(3) prints ill result.

[Tsurutani Naoki]

David Schultz wrote:
> Thanks for investigating this. It's interesting that the problem
> only happens with -fgcse, and then only on amd64 machines in
> 32-bit mode. Does this happen in a more recent version of FreeBSD?
> 
> I don't have an amd64 machine available for testing, and the
> vendor's dtoa code is a little hard to read, especially if we're
> looking for a compiler bug here. Some ideas:
> 
> - See whether contrib/gdtoa/dmisc.c or contrib/gdtoa/dtoa.c is the
>   problem. (That is, compile only one of those with -O2 and see
>   what happens.)
> 
> - Compile libc with -g in your CFLAGS, then run the program with a
>   breakpoint on the 'quorem' function. See what value it returns.
>   It should never return more than 9.

Thank you for your reply.
But I do not know how to execute you wrote...
Would you tell me ?


---
Tsurutani Naoki
turutani at scphys.kyoto-u.ac.jp