[Scons-users] cache not working as expected for a recompile in another directory

[William Blevins]

I thought about this some more, and I don't think I have enough information
about your configuration.


Question: Is the original case?

A/SConstruct
A/<copy of all other code>

B/SConstruct
B/<copy of all other code>

OR

A/SConsctruct
A/B/<copy of code>
A/C/<copy of code>

The Nodes in the second case are not the same Nodes.

Notes:

Regardless, a Node's signature also depends on it's dependencies, so just
because a file has is binary equal it may not mean that all it's
dependencies are...

V/R,
William

On Thu, Nov 19, 2015 at 9:56 AM, William Blevins <wblevins001 at gmail.com>
wrote:

>
> On Thu, Nov 19, 2015 at 9:11 AM, Abt, Johannes <johannes.abt at advantest.com
> > wrote:
>
>> On  Montag, 16. November 2015 20:46, Tom Tanner wrote:
>>
>> > The directory name will be included in the command line, which is
>> > included as part of the calculation when determining if something needs
>> > to be built.
>>
>> I checked that with a (trivial) "helloworld" example. I compile it in two
>> different directories.
>>
>> SConstruct:
>> -----
>> env = Environment()
>> env.CacheDir('../CacheDir')
>> env.Program(target = 'helloworld', source = ["helloworld.c"])
>> ----
>>
>> $ scons --quiet --cache-debug=-
>> CacheRetrieve(helloworld.o):  4055d8dd14fc46b0c3581d3de44bf7ba not in
>> cache
>> CachePush(helloworld.o):  pushing to 4055d8dd14fc46b0c3581d3de44bf7ba
>> CacheRetrieve(helloworld):  9dde76adbcb82ed244ea692c8ab09d11 not in cache
>> CachePush(helloworld):  pushing to 9dde76adbcb82ed244ea692c8ab09d11
>> $ mkdir ../new-dir
>> $ cp SConstruct hello.h helloworld.c ../new-dir
>> $ cd ../new-dir/
>> $ scons --quiet --cache-debug=-
>> CacheRetrieve(helloworld.o):  retrieving from
>> 4055d8dd14fc46b0c3581d3de44bf7ba
>> CacheRetrieve(helloworld):  retrieving from
>> 9dde76adbcb82ed244ea692c8ab09d11
>>
>> So, no, at least on this case, the directory name does not influence the
>> build signature.
>>
>
> If I understand this snippet correctly, you tried compiling the same file
> from two different directories.  This isn't equivalent to your test case
> where you have 2 binary equal files in two different locations.  In this
> test snippet, the Node representation of the file (regardless of what
> directory you are calling SCons from) is the same; whereas, with two
> different files, the Nodes are different because the absolute path (and
> relative path from the SConstruct) are different.
>
>
>>
>> Regards,
>> Johannes
>> _______________________________________________
>> Scons-users mailing list
>> Scons-users at scons.org
>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>
>
>
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