make behaviour

[Ralf Stephan]

Hello,

Up to one of the last beta versions, 'make' only built new libraries once.

Now, each time I switch branches to an older one and merge develop,

'make' will rebuild python-2.7.8, ATLAS and whatnot, taking half an hour

just for a branch switch on a 6-core, 8GB desktop machine.

As make is still recommended in the documentation, I consider this a bug.

But, noone else complained, so what am I missing?

Regards,

[Francois Bissey]

Well, “we” decided that was the only sane behaviour and made it the default.
I’ll try to find the thread for you.

François

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[Francois Bissey]

see https://groups.google.com/forum/#!topic/sage-devel/tyXJC2rtsag

> On 3/11/2014, at 22:07, Ralf Stephan <gtr...@gmail.com> wrote:
>

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[Ralf Stephan]

Thanks, I should use sage -f more often.

So, what became of Jeroen's idea of using the

"order only dependency" feature of GNU make?

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[Jeroen Demeyer]

On 2014-11-03 10:23, Ralf Stephan wrote:
> Thanks, I should use sage -f more often.
>
> So, what became of Jeroen's idea of using the
> "order only dependency" feature of GNU make?

Still a good idea. If Volker considers it a good idea for Sage-6.4, I'll
make a patch quickly.

[Volker Braun]

This probably needs a bunch of testing to figure out which dependencies are not really compiled-in, so I wouldn't want to rush it into 6.4. 

A better long-term plan is IMHO to use hashdist, which solves both the "compile time when switching branches" and LD_LIBRARY_PATH issues.

[Jeroen Demeyer]

On 2014-11-03 10:37, Volker Braun wrote:
> A better long-term plan is IMHO to use hashdist, which solves both the
> "compile time when switching branches" and LD_LIBRARY_PATH issues.

I don't know about hashdist, but I don't see how it could magically fix
the "compile time when switching branches" issue.

Anyway, make does a lot of things right (more so than
distutils/setuptools/scons/... IMHO), we just need to use it well.

Jeroen.

[Volker Braun]

On Monday, November 3, 2014 9:44:10 AM UTC, Jeroen Demeyer wrote:

I don't know about hashdist, but I don't see how it could magically fix
the "compile time when switching branches" issue.

By caching properly, and using tarball + build script + variables as hash key. So you never have to recompile anything that you have already compiled once before.

 

[kcrisman]

Huh, I noticed that, but figured I had just been doing something wrong. 

[Jeroen Demeyer]

So is it comparable to ccache then (caching all build output, not just
from .c files)?

[Jeroen Demeyer]

On 2014-11-03 10:23, Ralf Stephan wrote:

> Thanks, I should use sage -f more often.
>
> So, what became of Jeroen's idea of using the
> "order only dependency" feature of GNU make?

I created

http://trac.sagemath.org/ticket/17286

[Volker Braun]

On Tuesday, November 4, 2014 12:18:22 PM UTC, Jeroen Demeyer wrote:

So is it comparable to ccache then (caching all build output, not just
from .c files)?

Yes except that ccache doesn't cache the building, tuning, and linking...