MT-safe exception and thread library

[Andrey Slepuhin]

Teemu Torma wrote:
> 
>     From:  hjl@lucon.org (H.J. Lu)
>     Date:  Tue, 16 Dec 1997 11:29:29 -0800 (PST)
> 
>     I am not sure if I like the multilibs for the Thread-safe EH support.
>     That may be a problem for glibc. I'd like to see an option for a
>     single libgcc.a with the the Thread-safe EH support using weak
>     symols. I think it should work with gcc on platforms with weak
>     support. We can use SUPPORTS_WEAK to detect it. It should be
>     very easy to do.
> 
> It is not nice to use multilibs, but I am not sure if using weak
> symbols is that straightforward.  One problem that may arise is
> that MT code should usually be compiled with some preprocessor
> options (-D_REENTRANT for example), which also changes some other
> things, at least how "errno" is defined.  It may or may not cause
> problems in libgcc.

I agree that using weak symbols also may cause problems, but
anyway on my AIX box (which don't support weak symbols) I have
12 (!!!) different libraries with multilib enabled, so I must
to hack configuration files manually to disable cpu-specific
libraries, so it would be better to separate thread-specific
configuration options.

Andrey.