[cfe-dev] too slow to build clang

[Rick Mann]

On Jan 19, 2009, at 07:44:36, Douglas Gregor wrote:

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

It seemed to me like he was saying that after the initial build,  
changing a single file (presumably not a header file) still required a  
substantial rebuild. But I'm just speculating. Using the Xcode build  
project, I have not experienced this to be the case.

-- 
Rick