[Scons-users] Improve speed of windows environment

[Mats Wichmann]

On 4/23/19 11:48 AM, Pierre-Luc Boily wrote:
> Ok, I tried  your solution but scons complains that Object doesn't
> exist, (which is normal I know).  2 Stupids questions:
> 
> 1- What is the difference between tools and builders in the
> environment?  By doing this :
> DefaultEnvironment(tools=[])
> env=Environment(tools=[],...)
> 
> both tools and builders are now empty.

if the builder needs a tool and the tool is not found, then you don't
get the builder.

you need to deduce the tools you do need and give them in the
Enviroment() call.  That's not necessarily trivial to figure out, I
don't think there's a published mapping, but you certainly need a
compiler and linker.

The standard tool modules call the functions that create the associated
builders, so for example we see:

SCons/Tool/link.py calls SCons.Tool.createSharedLibBuilder(env),
SCons.Tool.createProgBuilder(env) and
SCons.Tool.createLoadableModuleBuilder(env)

while SCons/Tool/cc.py calls SCons.Tool.createObjBuilders(env)

The downside with doing it this way is that it becomes OS-specific; for
Windows you need msvc, mslink and mslib tools, and so on.

> 
> 2- I need env.Object, env.Library env.Program, but those are gone from
> the BUILDERS section.  How to I add them when I create the Environment? 
> Tried this, but that doesn't work : 
> sconsEnv = SCons.Environment.Environment(MSVC_VERSION = '10.0',
> TARGET_ARCH = 'x86', tools=['Object'])
> 
> Thank you very much!
> 
> Pierre-Luc
> 
> 
> Le mar. 23 avr. 2019, à 10 h 54, Bill Deegan <bill at baddogconsulting.com
> <mailto:bill at baddogconsulting.com>> a écrit :
> 
>     Yes.
>     This has long been the case.
>     Launching processes in Windows is MUCH slower than linux.
>     When SCons starts up it tries to load all the default tools.
>     This involves launching numerous processes to see what tools are
>     available and also which version(s)
>     You can speed this up by only loading the tools you're using on windows.
> 
>     Do you only use env.Program() or do you also use Program() (which
>     uses the DefaultEnvironment())
>     So:
>     DefaultEnvironment(tools=[])
>     env=Environment(tools=[only the tools you're using],...)
> 
>     Should help.
> 
>     -Bill
> 
> 
> 
>     On Tue, Apr 23, 2019 at 10:07 AM Pierre-Luc Boily
>     <pierreluc.boily at gmail.com <mailto:pierreluc.boily at gmail.com>> wrote:
> 
>         Hello!
> 
>         I just realized that the creation of an environment is faster
>         under centos
>         compared to windows 10.  See below Dump trace with --deubg=time
>         arguments :
> 
>         Centos : https://pastebin.com/UPggyDcj
>         Windows : https://pastebin.com/11YzKNDH
> 
>         I already read somewhere that tool creation is time consuming,
>         but both
>         centos\windows environments looks similar to be regarding
>         tools..  So, I
>         don't know why windows takes 1500 ms compare to 300ms for centos.
> 
>         Any idea?
> 
>         thx!
> 
> 
> 
>         --
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