[Scons-users] Specify Toolchain for Windows

[Bill Deegan]

On Fri, May 19, 2017 at 8:06 AM, R0b0t1 <r030t1 at gmail.com> wrote:

> On Thu, May 18, 2017 at 2:03 PM, Zarko Berberski (Aditi Staffing LLC)
> via Scons-users <scons-users at scons.org> wrote:
> > Are you launching scons.py from some command shell/script ?
> >
> > The setup I'm working with uses cygwin64 and the build script adds
> "C:\cygwin64\usr\x86_64-w64-mingw32\sys-root\mingw\bin" (and the whole
> slew of others) so scons.py already has it and doesn't need build.
> >
> > When I need to invoke scons.py standalone (like form a debugger) I
> inject a file by adding something like:
> >
> > Import os, sys
> > SconsStarter = os.path.join( os.path.dirname(__file__),
> "SconsStarter.py")
> > execfile(SconsStarter)
> >
> > to the very beginning of scons.py and SconsStarter.py adds all paths I
> need, like:
> > ------------------------------------------------------------
> ----------------
> > BuildRoot = r"C:\cygwin64\home\v-zaberb"
> >
> > BuildPath = [
> >               r"C:\ocamlmgw64\bin",
> >               r"C:\PROGRA~2\MICROS~1.0\VC\bin\amd64",
> >               r"C:\PROGRA~2\MICROS~1.0\VC\bin",
> >               r"C:\PROGRA~2\MICROS~4\F#\4.0\FRAMEW~1\v4.0/",
> >               r"C:\cygwin64\usr\x86_64-w64-mingw32\sys-root\mingw\bin"
> > ]
> >
> > SconsPath = [ join(sys.prefix, 'scons'),    # throwaway, scons.py eats
> sys.path[0]
> >               join(sys.prefix, 'Lib', 'site-packages', 'scons-2.5.0'),
> >               join(sys.prefix, 'Lib', 'site-packages', 'scons-2.5.0',
> 'scons')
> >               ]
> >
> > sys.path = SconsPath + BuildPath + sys.path
> > ------------------------------------------------------------
> ----------------
> >
> > Oh and you do need to put one extra path at the top of your sys.path
> since scons.py is just going to eat it :-) Not kidding:
> >
> > https://bitbucket.org/scons/scons/src/f34900d9bfd84fd3c44ebe5763dfad
> 0e8bb1e247/src/script/scons.py?at=default&fileviewer=file-
> view-default#scons.py-68
> >
>
> I am running SCons from PowerShell:
>
> `C:\Python27\python.exe "C:\Python27\Scripts\scons.py"`
>

Typically modern pythons install the py.exe which you can use as follows:

py -2 "C:\Python27\Scripts\scons.py"`
(and soon when scons 3.0)
py -3 "C:\Python27\Scripts\scons.py"`

Also in your case you can do the following:

(from powershell)
$ENV:PATH += ";C:\Python27\Scripts\"

Then just run scons. (there should be a scons.bat installed there as well.



>
> The Python 2.7 installer didn't add itself to my path, and it
> conflicts with Python 3.6. Consequently I run SCons by referencing
> both locations explicitly.
>
> This seems to work, but SCons is using a MinGW installation that was
> either installed alongside Python 2.7 or incidentally by some other
> POSIX-software-for-Windows package.
>
> I tried to duplicate the path as you recommended, but SCons is still
> trying to use the old toolchain:
>
> ```Python
> path = ['C:/MinGW/x86_64-6.3.0-posix-seh-rt_v5-rev2/mingw64/bin',
>         'C:/MinGW/x86_64-6.3.0-posix-seh-rt_v5-rev2/mingw64/bin']
>
> environ = Environment(tools=[])
> environ.PrependENVPath('PATH', path)
> environ.Tool('default')
>
> shooter = environ.Program(target=target, source=sources,
>     PATH=path, LIBS=libraries, CPPPATH=incpath, LIBPATH=libpath)
> ```
>
>
Point me to the installation kit you used for mingw and I'll try it on my
machine.
The above should work. If not likely there's a bug to be filed/fixed.

Remove PATH from your Program(). Not needed.


> I appreciate the discussion and can't complain about the quality of
> the help, but my experience with SCons on Windows indicates to me that
> there is *no* build system that is easy to use on Windows. If SCons
> worked, it would be easier to configure than CMake (far easier), but
> as it is it doesn't seem to work and I may need to move back to CMake.
>

Works for me and many others.
Windows is a first class platform for SCons.

-Bill
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