Steve Clamage wrote:
> On 09/09/08 09:35, Stefan Teleman wrote:
>>
>>
>> Steve Clamage wrote:
>>
>>> Apache libstdcxx is different -- it must be built for
>>> single-threaded or MT use.
>>>
>>> Let's take the case where we provide only an MT version of the
>>> runtime library.
>>>
>>> I'm not clear on the consequences of linking code compiled without
>>> -DRE_ENTRANT with MT code. Is that always safe? If so, maybe the
>>> only issue would be performance. (We don't yet know whether
>>> performance is an issue.)
>>
>> We can force stdcxx into thinking it's always MT, even for those
>> cases where the user application hasn't passed -mt -D_REENTRANT to
>> the compiler (by secretly raising _RWSTD_REENTRANT in the internal
>> config.h file).
>
> That won't help the case of modules that don't include headers from
> libstdcxx, or that include system headers before including libstdcxx
> headers.
>
> My original question remains: Is it safe to mix .o files compiled with
> and without -D_REENTRANT ?
I believe so, at least in Solaris 10 and later. As far as I can tell,
the only thing that -D_REENTRANT does is make some additional prototypes
visible, required for POSIX conformance. I don't think it changes
anything in the actual resulting binary.
-- Garrett
>
> ---
> Steve Clamage, stephen.clamage at sun.com
