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#10907: Update OS X installer build README to better reflect
current build practices.

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Mac/BuildScript/README.txt

-Building a MacPython distribution
-=================================
+Building a Python Mac OS X distribution
+=======================================
 
-The ``build-install.py`` script creates MacPython distributions, including
-sleepycat db4, sqlite3 and readline support.  It builds a complete 
+The ``build-install.py`` script creates Python distributions, including
+certain third-party libraries as necessary.  It builds a complete 
 framework-based Python out-of-tree, installs it in a funny place with 
 $DESTROOT, massages that installation to remove .pyc files and such, creates 
 an Installer package from the installation plus other files in ``resources`` 
 and ``scripts`` and placed that on a ``.dmg`` disk image.
 
-Prerequisites
--------------
+As of Python 2.7.x and 3.2, PSF practice is to build two installer variants
+for each release:
 
-* A MacOS X 10.4 (or later)
+1.  32-bit-only, i386 and PPC universal, capable on running on all machines
+    supported by Mac OS X 10.3.9 through (at least) 10.6::
 
-* XCode 2.2 (or later), with the universal SDK
+        python2.6 build-installer.py \
+            --sdk-path=/Developer/SDKs/MacOSX10.4u.sdk \
+            --universal-archs=32-bit \
+            --dep-target=10.3 
+            # These are the current default options
 
-* No Fink (in ``/sw``) or DarwinPorts (in ``/opt/local``), those could
+    - builds the following third-party libraries
+
+        * Bzip2
+        * Zlib 1.2.3
+        * GNU Readline (GPL)
+        * SQLite 3
+        * NCurses
+        * Oracle Sleepycat DB 4.8 (Python 2.x only)
+
+    - requires ActiveState ``Tcl/Tk 8.4`` (currently 8.4.19) to be installed for building
+
+    - current target build environment:
+        
+        * Mac OS X 10.5.8 PPC or Intel
+        * Xcode 3.1.4 (or later)
+        * ``MacOSX10.4u`` SDK (later SDKs do not support PPC G3 processors)
+        * ``MACOSX_DEPLOYMENT_TARGET=10.3``
+        * Apple ``gcc-4.0``
+        * Python 2.6 for documentation build with Sphinx
+
+    - alternate build environments:
+
+        * Mac OS X 10.4.11 with Xcode 2.5
+        * Mac OS X 10.6.6 with Xcode 3.2.5
+            - need to change ``/System/Library/Frameworks/{Tcl,Tk}.framework/Version/Current`` to ``8.4``
+
+2.  64-bit / 32-bit, x86_64 and i386 universal, for OS X 10.6 (and later)::
+
+        python2.6 build-installer.py \
+            --sdk-path=/Developer/SDKs/MacOSX10.6.sdk \
+            --universal-archs=intel \
+            --dep-target=10.6
+
+    - uses system-supplied versions of third-party libraries
+    
+        * readline module links with Apple BSD editline (libedit)
+        * builds Oracle Sleepycat DB 4.8 (Python 2.x only)
+
+    - requires ActiveState Tcl/Tk 8.5.9 (or later) to be installed for building
+
+    - current target build environment:
+        
+        * Mac OS X 10.6.6 (or later)
+        * Xcode 3.2.5 (or later)
+        * ``MacOSX10.6`` SDK
+        * ``MACOSX_DEPLOYMENT_TARGET=10.6``
+        * Apple ``gcc-4.2``
+        * Python 2.6 for documentation build with Sphinx
+
+    - alternate build environments:
+
+        * none
+
+
+General Prerequisites
+---------------------
+
+* No Fink (in ``/sw``) or MacPorts (in ``/opt/local``) or other local
+  libraries or utilities (in ``/usr/local``) as they could
   interfere with the build.
 
-* The documentation for the release must be available on python.org
+* The documentation for the release is built using Sphinx
   because it is included in the installer.
 
+* It is safest to start each variant build with an empty source directory
+  populated with a fresh copy of the untarred source.
+
 
 The Recipe
 ----------
 
-Here are the steps you need to follow to build a MacPython installer:
+Here are the steps you need to follow to build a Python installer:
 
-*  Run ``./build-installer.py``. Optionally you can pass a number of arguments
-   to specify locations of various files. Please see the top of
+* Run ``build-installer.py``. Optionally you can pass a number of arguments
+  to specify locations of various files. Please see the top of
   ``build-installer.py`` for its usage.
 
-  Running this script takes some time, I will not only build Python itself
+  Running this script takes some time, it will not only build Python itself
   but also some 3th-party libraries that are needed for extensions.
 
 * When done the script will tell you where the DMG image is (by default
   somewhere in ``/tmp/_py``).
 
-Building a 4-way universal installer
-....................................
+Building other universal installers
+...................................
 
 It is also possible to build a 4-way universal installer that runs on 
-OSX Leopard or later::
+OS X Leopard or later::
 
-  $ ./build-installer.py --dep-target=10.5 --universal-archs=all --sdk=/
+  python 2.6 /build-installer.py \
+        --dep-target=10.5
+        --universal-archs=all
+        --sdk-path=/Developer/SDKs/MacOSX10.5.sdk
 
-This requires that the deployment target is 10.5 (or later), and hence
-also that your building on at least OSX 10.5.
+This requires that the deployment target is 10.5, and hence
+also that you are building on at least OS X 10.5.  4-way includes
+``i386``, ``x86_64``, ``ppc``, and ``ppc64`` (G5).  ``ppc64`` executable
+variants can only be run on G5 machines running 10.5.  Note that,
+while OS X 10.6 is only supported on Intel-based machines, it is possible
+to run ``ppc`` (32-bit) executables unmodified thanks to the Rosetta ppc
+emulation in OS X 10.5 and 10.6.
+
+Other ``--universal-archs`` options are ``64-bit`` (``x86_64``, ``ppc64``),
+and ``3-way`` (``ppc``, ``i386``, ``x86_64``).  None of these options
+are regularly exercised; use at your own risk.
+
 
 Testing
 -------
 
-The resulting binaries should work on MacOSX 10.3.9 or later. I usually run
-the installer on a 10.3.9, a 10.4.x PPC and a 10.4.x Intel system and then
-run the testsuite to make sure.
+Ideally, the resulting binaries should be installed and the test suite run
+on all supported OS X releases and architectures.  As a practical matter,
+that is generally not possible.  At a minimum, variant 1 should be run on
+at least one Intel, one PPC G4, and one PPC G3 system and one each of 
+OS X 10.6, 10.5, 10.4, and 10.3.9.  Not all tests run on 10.3.9.
+Variant 2 should be run on 10.6 in both 32-bit and 64-bit modes.::
 
+    arch -i386 /usr/local/bin/pythonn.n -m test.regrtest -w -u all 
+    arch -X86_64 /usr/local/bin/pythonn.n -m test.regrtest -w -u all
+    
+Certain tests will be skipped and some cause the interpreter to fail
+which will likely generate ``Python quit unexpectedly`` alert messages
+to be generated at several points during a test run.  These can
+be ignored.
 
-Announcements
--------------
-
-(This is mostly of historic interest)
-
-When all is done, announcements can be posted to at least the following
-places:
--   pythonmac-sig@python.org
--   python-dev@python.org
--   python-announce@python.org
--   archivist@info-mac.org
--   adcnews@apple.com
--   news@macnn.com
--   http://www.macupdate.com
--   http://guide.apple.com/usindex.lasso
--   http://www.apple.com/downloads/macosx/submit
--   http://www.versiontracker.com/ (userid Jack.Jansen@oratrix.com)
--   http://www.macshareware.net (userid jackjansen)
-
-Also, check out Stephan Deibels http://pythonology.org/market contact list