[Scons-users] compiler detection

[Gary Oberbrunner]

On Mon, Oct 29, 2012 at 3:40 PM, Evan Driscoll <driscoll at cs.wisc.edu> wrote:


> On 10/29/2012 02:40 PM, Kraus Philipp wrote:

> >

> > Am 29.10.2012 um 18:21 schrieb Evan Driscoll:

> >> Native Python/SCons knows nothing of MinGW paths; the /usr/bin/sh and

> >> /c/blah paths are translated to Windows paths by the MinGW libraries.

> >>

> >> You need to set env["SHELL'] to whatever the physical location of sh.exe

> >> is, e.g. env["SHELL"] = "c:/programs/mingw/bin/sh.exe" to make

> something up.

> >

> > The scons script is run from the MinGW shell (it is /bin/sh).

>

> ...as I said before, that doesn't matter.

>

>

> > I have tried to setup the Windows

> > path to the sh.exe and also the unix-styled path, in all cases the

> env.command stops with

> > the error that the shell is not found.

>

> Open CMD.exe and enter the Windows path to sh.exe. Does it run?

>

> When you put in the Windows path, are you perhaps using

> unescaped-backslashes (which are then escaping other things)? Is there

> any chance you're overwriting env["SHELL"] with something else later?

>

> What's the (Windows) path to sh.exe? What's the exact line you're using

> to set env["SHELL"]?

>

> And Philipp, don't forget what Evan said in the other thread; to use mingw

shell as the shell for Commands in a native-python SCons, you will have to
set the spawn function:

from SCons.Platform.win32 import exec_spawn

import os
env = Environment(ENV = {'PATH' : os.environ["PATH"]})
env["SHELL"]=env.WhereIs("bash")
env["SPAWN"] = (lambda sh, esc, cmd, args, env_param:
                exec_spawn([sh, '-c', ' '.join(args)], env_param))

(actually I'm not 100% sure that is sufficient, because cmd.exe and sh/bash
have different quoting rules, and I'm not sure this handles
quoting/escaping... but it's a start anyway.)

Of course there's another way: in the Command itself, just do:
 env.Command('tgt', 'src', '''c:/programs/mingw/bin/sh.exe -c cat "$SOURCE"

> "$TARGET"''')


but even there you will have to probably do some pathname manipulation (at
least sometimes), because $SOURCE will expand to the Windows path, not
mingw.

--
Gary
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