[Scons-users] Possible python 3 issue?

[Bill Deegan]

Peter,

If you change line 26 in src/SConscript to the following it will work:
    # Return the list of module paths
    return list(buildmodpath)

The issue is you're assigning *PATH = map().. which is fine in py27, but in
py3, you get a view into the map. (It does lazyier evaluation).
So by wrapping with list() you get a normal list and everything works
fine...

In fact.. I don't think you actually need the map.. (which you shouldn't as
with duplicate=0 it'd have to include the build and src versions of the
paths you specify)
If I change the return to return modpath, it seems to build fine as well.

-Bill


On Wed, Oct 16, 2019 at 10:26 AM Bill Deegan <bill at baddogconsulting.com>
wrote:

> so sounds like a scanner issue then.. could it be using get_contents,
> instead of get_text_contents?
>
> On Wed, Oct 16, 2019 at 9:29 AM Mats Wichmann <mats at wichmann.us> wrote:
>
>> On 10/16/19 10:04 AM, Peter Diener wrote:
>> > Hi,
>> >
>> > I have been successfully using scons 3.1.0 with python 2.7.12 to build
>> a
>> > mostly Fortran based software project on Linux (multiple
>> distributions).
>> > I have the source tree separated from the build directory and are
>> > therefore using variantdir and an SConscript file. Recently I tried to
>> > run this with python 3.7.4 and found that it did not work as scons
>> > failed to correctly find the dependencies on module files.
>> >
>> > I was able to reproduce this with a smaller test example that mimics
>> the
>> > setup in my larger software project. I have attached a zip file with
>> > that source tree as well as build log files (in build_log.2.7.12 and
>> > build_log.3.7.4) with all errors and output when building with
>> > scons --tree=all. As can be seen from the build log files, when
>> building
>> > with python 3, scons does not seem to find the dependencies of the main
>> > program on the module files.
>> >
>> > I have also tried with the latest release version of scons 3.1.1 with
>> > the same results. It works with python 2 but not with python 3.
>> >
>> > So my question is: am I doing something wrong in my SConstruct and
>> > SConscript files that just happens to work with python 2 and not with
>> > python 3? Or is this a problem with scons and python 3?
>>
>> Possibly a bit of both.  There's an existing scons issue that points out
>> some weakness in submodule support (#3366), and given that Fortran isn't
>> the most heavily used language in the scons universe, there may still be
>> untested code paths in the conversion to Python 3, that don't get
>> exercised by what's in the test suite (there are some fairly new tests
>> in that area, which you know since you contributed there :) )
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>
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