[Boost-users] Slow build with clang?

Subject: [Boost-users] Slow build with clang?
From: Richard Hadsell (hadsell_at_[hidden])
Date: 2012-12-11 16:28:32

I have been building the Boost libraries with g++ for many years.  Someone recommended trying Clang, so I downloaded 1.52.0 and built it first with g++ 4.5.1 on Fedora 14.  Then I started a build with clang 3.3, and it is taking forever.  I have not made 
any measurements, but it must be at least an order of magnitude slower than g++.  The math library seems to take the longest, but maybe there are other slow-building libraries yet to come.

Am I doing something wrong, or should I expect the clang build to be very slow?

In myuser-config I have this:

using clang : 3.3 : /directory_where_we_installed_clang/bin/clang :<compileflags>"-fPIC"<linkflags>"-fPIC" ;

The command line is this:

bin/bjam --user-config=myuser-config threading=multi instruction-set=core2 address-model=64 variant=release link=static,shared --stagedir=stageF14C clean

The clang version is: clang version 3.3 (trunk 169541) (llvm/trunk 169537)
The OS is Linux Fedora 14.

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