Re: [Boost-users] Building boost faster: /MP

Igor R wrote:

...

If this is a compiler flag, then can you try full build with

cxxflags=-MP

and then without and report the timings? If this is a magic way to make builds faster, it can be enabled by default.

It is a compiler flag, and it really improves build times in milticore environment, but it's somewhat limited: http://msdn.microsoft.com/en-us/library/bb385193.aspx

But /MP only affects cl.exe when you give it more than one source file, and AFAIK bjam still spawns one cl.exe per source file. (Which is a pity. The way cl.exe works, I believe it actually improves compile time to give it multiple files to work on even without /MP.) Try the -j option to bjam instead, to make it spawn multiple cl.exe processes. Sebastian