Re: Single-thread builds on GCC >= 3.4.0

From: Andreas Huber (ahd6974-spamgroupstrap_at_[hidden])
Date: 2005-01-19 11:15:58

John Maddock wrote:
>> Given ...
>>
>> http://aspn.activestate.com/ASPN/Mail/Message/boost/2306170
>>
>> ... it seems that the GCC toolset should define BOOST_DISABLE_THREADS
>> for single-threaded builds on GCC >= 3.4.0?
>
> Except that would make single-thread builds binary incompatible with
> the default Boost behaviour with that compiler.

Hmmm, wasn't the same true for GCC < 3.4.0? AFAICS the only thing that 
has changed is that there is no longer a safe way to detect whether the 
user requested an MT or ST build on the compiler command line. Instead, 
MT-ness is discovered through a define in std headers that the compiled 
code includes.

> For now I believe
> it's safer to make Boost "always thread safe" with gcc 3.4.

Even when the user explicitly requests ST with <threading>single on the 
bjam command line? Sure, a user can compile a boost lib with 
<threading>single and then use that lib from code compiled normally 
(without bjam), which would presumably lead to a disaster. However, 
(s)he could have done the same with GCC < 3.4.0, right?

What am I missing?

Regards,

-- 
Andreas Huber
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