Change the default SConscriptChdir() behavior to NOT chdir to the SConscript directory.

3 files changed, 23 insertions, 2 deletions

diff --git a/src/CHANGES.txt b/src/CHANGES.txt
index a6406a7..ca480de 100644
--- a/src/CHANGES.txt
+++ b/src/CHANGES.txt
@@ -75,6 +75,9 @@ RELEASE 0.12 - XXX
     This allows you to build in another directory by simply changing
     there and pointing at the SConstruct file in another directory.
 
+  - Change the default SConscriptChdir() behavior to change to the
+    SConscript directory while it's being read.
+
   From Lachlan O'Dea:
 
   - Add SharedObject() support to the masm tool.
diff --git a/src/RELEASE.txt b/src/RELEASE.txt
index 535384d..8ae7dfb 100644
--- a/src/RELEASE.txt
+++ b/src/RELEASE.txt
@@ -25,6 +25,15 @@ RELEASE 0.12 - XXX
   This is the twelfth alpha release of SCons.  Please consult the
   CHANGES.txt file for a list of specific changes since last release.
 
+  Please note the following important changes since release 0.11:
+
+  - The default behavior of SCons is now to change to the directory in
+    which an SConscript file resides while reading the SConscript file.
+    To disable this and restore the previous behavior of staying in the
+    top-level directory, specify the following in your SConstruct file:
+
+        SConscriptChdir(0)
+
   Please note the following important changes since release 0.10:
 
     - The default suffix for shared object files when using gcc has
diff --git a/src/engine/SCons/Script/SConscript.py b/src/engine/SCons/Script/SConscript.py
index ab071e0..8dd4ef3 100644
--- a/src/engine/SCons/Script/SConscript.py
+++ b/src/engine/SCons/Script/SConscript.py
@@ -61,7 +61,7 @@ launch_dir = os.path.abspath(os.curdir)
 global_exports = {}
 
 # chdir flag
-sconscript_chdir = 0
+sconscript_chdir = 1
 
 def SConscriptChdir(flag):
     global sconscript_chdir
@@ -232,7 +232,16 @@ def SConscript(*ls, **kw):
                     # in different Repositories.  For now, cross that
                     # bridge when someone comes to it.
                     ldir = default_fs.Dir(f.dir.get_path(sd))
-                    default_fs.chdir(ldir, change_os_dir=sconscript_chdir)
+                    try:
+                        default_fs.chdir(ldir, change_os_dir=sconscript_chdir)
+                    except OSError:
+                        # There was no local directory, so we should be
+                        # able to chdir to the Repository directory.
+                        # Note that we do this directly, not through
+                        # default_fs.chdir(), because we still need to
+                        # interpret the stuff within the SConscript file
+                        # relative to where we are logically.
+                        os.chdir(f.rfile().dir.abspath)
 
                     # Append the SConscript directory to the beginning
                     # of sys.path so Python modules in the SConscript