Compiling utilizing multiple CPUs

[Chuck Robey]

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Chuck Swiger wrote:
> On Jan 14, 2008, at 3:55 PM, Christoffer Strömblad wrote:
>> Having looked through much of the available documentation one thing
>> continues to elude me... Is it possible to specify globally how many
>> CPUs are available when compiling a port? When I compile a port now it
>> seems as if only one CPU is used, even though more are available.
> 
> The quality of the Makefiles or similar used by individual ports varies,
> and many of them are not safe to compile in a multithreaded fashion. 
> You can set "MAKEFLAGS=-j3" or similar in your environment, but it's
> really not recommended.
> 
I think it's necessary to tell why its not recommend it: because many
makefiles are insufficiently sedt up to correctly allow multiple cpu's to
work side by side.  the make(7) utility itself uses the j flag correctly,
and I have had many correct items correctly compiled.  You just need to
understand the makefiles very carefully, and not try the multiple makefile
trick without being certain of your makefile.
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