[cfe-dev] too slow to build clang

[Douglas Gregor]

On Jan 19, 2009, at 5:52 AM, Jiandong Lu wrote:

> hi,everyone.
> I logined llvm's bugzilla,got a bug.And I want to fix it.

Great!

>
> I add only debug statement to output something ,and than build clang  
> in my FreeBSD 7.1 in vmware.
> I found it took about tens of minutes.Although my machine is a  
> little slow (celeron 2.4 G cpu),
> I think it took too many minutes.Maybe there something is wrong.
>

Clang and LLVM are relatively large, so it does take some time to  
compile them. The biggest issue is often memory: does your VMware  
virtual machine have at least 1 GB memory?

Also, it helps to configure LLVM with --enable-targets=<some small  
subset of targets>. Otherwise, you're spending a lot of time compiling  
and linking back-end targets you probably don't care about (Sparc,  
Cell, etc.).

	- Doug
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