5 # SCons is at #/tools/scons-<v>/engine/SCons/__init__.py
6 # site_init is at #/site_scons/site_init.py
8 sconsbase = os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(
9 inspect.currentframe().f_code.co_filename))),"tools")
10 sconsbase = os.path.join(
11 sconsbase,sorted((f for f in os.listdir(sconsbase) if f.startswith("scons-")))[-1])
12 sconsengine = os.path.join(sconsbase, 'engine')
13 sconsscript = os.path.join(sconsbase, 'script', 'scons')
15 if os.path.dirname(os.path.dirname(os.path.abspath(SCons.__file__))) != sconsengine:
16 import os, sys, SCons.Util
17 SCons.Util.display("scons: Switching version")
20 # This is really ugly. SCons has already switched into the
21 # top-level directory when this code is executed. To make 'scons
22 # -u <target>' work, we need to switch back into the orgiginal
23 # startup dir. This directory however is only available in a local
24 # variable called 'target_top' in SCons.Script.Main._main.
26 # We walk the stack to find a local variable called
27 # 'target_top'. If we can't find it (could really only happen if
28 # the SCons.Main code is changed considerably), we output a
29 # warning, that '-u' will probably fail (we re-start scons from
30 # the top-level directory, relative targets therefore will not
32 frame = sys._getframe()
33 target_top = marker = []
34 while frame and target_top is marker:
36 if frame : target_top = frame.f_locals.get('target_top',marker)
37 if target_top is marker:
38 SCons.Util.display("scons: WARNING: scons -u <target> will probably fail")
42 cdir = frame.f_locals.get('cdir', '.')
46 cdir = os.path.normpath(cdir)
47 if cdir.startswith('../'):
48 SCons.Util.display("scons: WARNING: failed to undo -C option")
49 elif cdir != '.' and not cdir.startswith('/'):
50 os.chdir('/'.join(('..' for _ in cdir.split('/'))))
51 os.environ['SCONS_LIB_DIR'] = sconsengine
52 os.execv(sys.executable, [sconsscript] + sys.argv)