clang++ 3.3 issue (excessively slow compile vs. gcc 4.6 in just one file of a port)

[Dimitry Andric]

On 19 Nov 2013, at 09:10, Matthias Andree <mandree at FreeBSD.org> wrote:
> Am 19.11.2013 08:49, schrieb Dimitry Andric:
...
>> Ok, this looks like http://llvm.org/PR16474 , which has a relatively
>> simple fix.  I have attached it, can you please try it out?  You can
>> just apply the patch to /usr/src and do:
>> 
>> make -C /usr/src/lib/clang
>> make -C /usr/src/usr.bin/clang/clang
>> sudo make -C /usr/src/usr.bin/clang/clang install
>> 
>> It should basically recompile just one file, and re-link the clang
>> executable.  I tried building ipsharpen.ii at -O3, and it uses about
>> 20 seconds now (on my relatively slow VM).
> 
> Dimitry,
> 
> thanks.
> 
> The patch speeds up the compile by one and a half orders of magnitude,
> and we're down to 30 s for my VM and compiling the .ii file.
> 
> The .cc now compiles in 22 s, rather than 500 s.
> 
> Excellent, problem solved!
> 
> Can we commit this (what the LLVM PR calls "regression") fix so it
> becomes part of 10.0-RELEASE?

I will commit it to head tonight, and after the normal MFC period of 3
days I will ask re@ to approve merging it to stable/10.

-Dimitry

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