Re: Slow compilation of guile-2.1.x

[Thompson, David]

On Mon, Nov 28, 2016 at 3:47 AM, Jan Synáček <address@hidden> wrote:
> On Fri, Nov 25, 2016 at 9:36 AM,  <address@hidden> wrote:
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>> On Fri, Nov 25, 2016 at 08:31:23AM +0100, Jan Synáček wrote:
>>> Hello,
>>>
>>> while building guile-2.1.4 for Fedora, I noticed that the compilation
>>> got *really* slow. I didn't measure it precisely, but as can be seen
>>> from [1] (about 20 minutes) and [2] (about 100 minutes with make check
>>> disabled), the time difference between the builds is roughly 80
>>> minutes... Release notes mention that the VM has been rewritten and
>>> the source is now compiled into ELF, but is it supposed to be this
>>> slow?
>>
>> Are you building from scratch? Because then yes, 2.1.x is expected
>> to bootstrap slowly [1]. The solution offered ATM is delivering a
>> half-bootstrapped system [2].
>
> Yes, but even a small (about 3 modules and a few 100s LoC) project of
> mine compiles about 3 times slower.

The compiler now performs many more optimizations.  If you want faster
compile time, turn off optimizations with 'guild compile -O0'.  Read
the output of 'guild compile -Ohelp' for more information.

- Dave