[Scons-users] debugging why scons is not using the cache?

[David Roundy]

When I created a minimal test case, the problem went away, and upon
embarking on a bisection campaign, it turned out that I had a
"env.CacheDir(None)" squirrelled away, which was previously on a different
environment, but got changed to be the same one I used for C++.  Changing
that environment made it work again.

Thanks for your help!

David


On Mon, Aug 5, 2013 at 12:21 PM, Bill Deegan <bill at baddogconsulting.com>wrote:


> David,

>

> I haven't used cachedir myself, but I do know it's used fairly widely with

> C/C++ compiles.

>

> Can you create a small test case which reproduces the problem?

>

> -Bill

>

>

> On Mon, Aug 5, 2013 at 11:51 AM, David Roundy <

> roundyd at physics.oregonstate.edu> wrote:

>

>> No, I didn't try that.  However, it just says "building `foo.o' because

>> it doesn't exist."

>>

>> I do have some new information:  the cache *does* work, it just isn't

>> working for C++ files.  It works fine for haskell files, and a few other

>> types... but most of my code is C++.  This rules out the possibility that

>> the cache directory simply is not writable.

>>

>> I have not yet figured out a way to make scons announce when it writes to

>> the cache, or when it fails to find something in the cache.  The

>> --cache-debug option seems to only have effect for commands for which the

>> cache works, i.e. it gives extra information for the times when files are

>> retrieved from cache, but not otherwise.

>>

>> David

>>

>>

>> On Mon, Aug 5, 2013 at 11:26 AM, Bill Deegan <bill at baddogconsulting.com>wrote:

>>

>>> David,

>>>

>>> Have you tried: scons --debug=explain ?

>>> I think it may "explain" why things are being built or not

>>>

>>> -Bill

>>>

>>>

>>> On Mon, Aug 5, 2013 at 11:00 AM, David Roundy <

>>> roundyd at physics.oregonstate.edu> wrote:

>>>

>>>> Hello,

>>>>

>>>> I've got

>>>>

>>>> CacheDir(os.environ['HOME'] + '/.cache/scons')

>>>>

>>>> right at the beginning of my SConstruct file, which works fine on one

>>>> computer, but on a different computer (with $HOME mounted over nfs,

>>>> incidentally) I am not getting any caching.

>>>>

>>>> Any suggestions as to how I might go about debugging this?

>>>>

>>>> David

>>>>

>>>> _______________________________________________

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>>>>

>>>>

>>>

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>>>

>>>

>>

>>

>> --

>> David Roundy

>>

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>>

>>

>

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>



-- 
David Roundy
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