[Scons-users] Using multiple scanners together

[William Blevins]

Brian,

I am looking to get this patch included in an upcoming SCons release.  This
should resolve the problem you have encountered.  Please give it a try and
let us know what you think?

https://bitbucket.org/scons/scons/pull-request/237/issue-2264-cross-language-scanner-support/diff

V/R,
William

On Fri, Mar 20, 2015 at 7:00 PM, William Blevins <wblevins001 at gmail.com>
wrote:

> Brian,
>
> You are correct.  Scanner types will not change once the initial scanner
> selection has been made.
>
> Example:
>
> Scanners exist: c_scan and b_scan
>
> Files: A.c include B.b
> Files: A.b include B.c
>
> Scanning A.c invokes the c_scan on both A.c and all dependencies
> Scanning A.b invokes the b_scan on both A.b and all dependencies
>
> I'm not sure if cross-language scanning is "broken" or it was never
> supported.  I assume the later.  There are bugs reports that capture this
> behavior already (though perhaps not generically).
>
> I have worked on a patch that could resolve this issue. After working
> through the system, I determined that the solution wasn't optimal.  A
> better solution would be to acquire a new scanner from the base selector
> mechanism rather than trying to nest scanners.
> https://bitbucket.org/scons/scons/pull-request/176/issue-2264-reworking-scannerbase-to-unify/diff
>
> V/R,
> William
>
>
>
> On Thu, Mar 19, 2015 at 4:13 PM, Brian Cody <brian.j.cody at gmail.com>
> wrote:
>
>> I have rediscovered an issue that I hacked around previously. I have a
>> project file I want to scan. This scan will produce a list of files with a
>> different extension. I then want to scan these files as well. The problem
>> is that I can't make SCons respect skeys when recursing. For example:
>>
>> env['SCANNERS'].append(SCons.Scanner.Scanner(scanners.scan_vhdl_file,
>> path_function=SCons.Script.FindPathDirs('VHD_PATH'), recursive=True,
>> skeys=['.vhd']))
>> env['SCANNERS'].append(SCons.Scanner.Scanner(scanners.scan_prj_file,
>> path_function=SCons.Script.FindPathDirs('VHD_PATH'), recursive=True,
>> skeys=['.prj']))
>>
>> This is the code I would expect to have to write. In this case, the
>> project file is scanned and the vhd files within are detected. It then
>> opens the vhd files using the project file scanner rather than the vhd file
>> scanner. Fine--I suppose recursive could be interpreted that way--but
>> disabling recursive doesn't help either. What ends up happening is that
>> SCons doesn't scan the vhd files at all, which I take as a different
>> interpretation of what recursive means. If the vhd files are given as the
>> original source, everything works fine.
>>
>> My hack is a hybrid scanner function that detects whether the file being
>> scanned in a project file or a vhd file, and it redirects to the proper
>> scanning function.
>>
>> Is there a more correct way to accomplish this?
>>
>> Thanks!
>> -Brian
>>
>> _______________________________________________
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>> Scons-users at scons.org
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>>
>>
>
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