[Scons-dev] First Pillar of Future SCons Tools

[anatoly techtonik]

That's a really good starting point. Parts is awesome. Need to merge
that part with
backward compatibility.

gxx.Register(
    # we assume that the system has the correct libraies installed to
do a cross build
    # or that the user add the extra check for the stuff the need
    hosts=[SystemPlatform('posix','x86'),SystemPlatform('posix','x86_64')],
    targets=[SystemPlatform('posix','x86'),SystemPlatform('posix','x86_64')],
    info=[
    GnuInfo(
        #standard location, however there might be
        # some posix offshoot that might tweak this directory
        # so we allow this to be set
        install_scanner=[
            PathFinder(['/usr/bin'])
            ],
        opt_dirs=[
                '/opt/'
            ],
        script=None,
        subst_vars={},
        shell_vars={'PATH':'${GXX.INSTALL_ROOT}'},
        test_file='g++',
        opt_pattern='gcc\-?([0-9]+\.[0-9]+\.[0-9]*|[0-9]+\.[0-9]+|[0-9]+)'
        )
    ]
)

Interesting if it is possible to make it completely data oriented, like:

---
- name: gxx
  platform:
    buildhost: posix 32, posix 64
    target:      posix 32, posix 64
  info:
   - type: GnuInfo
     search_paths:
       - /usr/bin
     opt_dirs:
       - /opt
     test_file: g++
     shell_vars:
       PATH: '${GXX.INSTALL_ROOT}'
     opt_pattern: 'gcc\-?([0-9]+\.[0-9]+\.[0-9]*|[0-9]+\.[0-9]+|[0-9]+)'




On Fri, Sep 26, 2014 at 6:21 PM, Kenny, Jason L <jason.l.kenny at intel.com> wrote:
> I believe this is what I tried to achieve in Parts.
>
> For example look at this file http://parts.tigris.org/source/browse/parts/trunk/parts/parts/tools/GnuCommon/gxx.py?view=markup
>
> You see the different version, platforms ( and cross platform support) for g++ on posix, windows, darwin ,solaris and android for x86, x86_64, ia64, phi cards, and some arm cases.
>
> The system decides based on the host and target we are building for in a given environment what set to use to find and configure the env with.
>
> I found this to be a great too way to support different tools as it "easy" for people to see what is going on, and easy to add support for a new version of some tool.
>
> Jason
>
> -----Original Message-----
> From: Scons-dev [mailto:scons-dev-bounces at scons.org] On Behalf Of anatoly techtonik
> Sent: Friday, September 26, 2014 8:01 AM
> To: SCons Development
> Subject: [Scons-dev] First Pillar of Future SCons Tools
>
> Hi,
>
> While patching Ansible stat module, the idea stormed me.
>
>     The information that SCons collects about Tool should be passed declarative and static.
>
> There are some more sparks that feature-creep over it.
>
>     Tool info should be declarative for better user experience while debugging and writing.
>     Tool info should be static data.
>     SCons itself decides how to combine tools based on static data that tool provides.
>
> Right now Tools `monkeypatch` SCons Environment dynamically, that's why it is SO HARD to understand what tool really provides. This in turn makes it REALLY HARD to study all tools to see common patterns.
> This in turn makes it ALMOST IMPOSSIBLE to squeeze all tools into mind to derive common abstract model for them without loosing possible (and
> crucial) details. And without abstract model we can not effectively communicate practical models and exchange ideas. The basic model for a tool should be static - what tool provides, if it exists or not.
>
>     If Tool needs to hack SCons deeper, it should be done in a separate method.
>     Monkeypatching of anything in SCons should be totally visible and accessible if needed.
>     SCons level of application objects should be separated on the next level over Python objects.
>
> Better stop now. Hopefully at least the first part is clear. In summary - tool info should be readable as YAML.
> --
> anatoly t.
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-- 
anatoly t.