281 lines
12 KiB
Plaintext
281 lines
12 KiB
Plaintext
============
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MacOSX Notes
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============
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This document provides a quick overview of some Mac OS X specific features in
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the Python distribution.
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* ``--enable-framework[=DIR]``
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If this argument is specified the build will create a Python.framework rather
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than a traditional Unix install. See the section
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_`Building and using a framework-based Python on Mac OS X` for more
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information on frameworks.
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If the optional directory argument is specified the framework it installed
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into that directory. This can be used to install a python framework into
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your home directory::
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$ configure --enable-framework=/Users/ronald/Library/Frameworks
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$ make && make install
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This will install the framework itself in ``/Users/ronald/Library/Frameworks``,
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the applications in a subdirectory of ``/Users/ronald/Applications`` and the
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command-line tools in ``/Users/ronald/bin``.
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* ``--with-framework-name=NAME``
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Specify the name for the python framework, defaults to ``Python``. This option
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is only valid when ``--enable-framework`` is specified.
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* ``--enable-universalsdk[=PATH]``
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Create a universal binary build of Python. This can be used with both
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regular and framework builds.
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The optional argument specifies which OSX SDK should be used to perform the
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build. This defaults to ``/Developer/SDKs/MacOSX.10.4u.sdk``, specify
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``/`` when building on a 10.5 system, especially when building 64-bit code.
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See the section _`Building and using a universal binary of Python on Mac OS X`
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for more information.
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* ``--with-univeral-archs=VALUE``
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Specify the kind of universal binary that should be created. This option is
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only valid when ``--enable-universalsdk`` is specified.
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Building and using a universal binary of Python on Mac OS X
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===========================================================
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1. What is a universal binary
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-----------------------------
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A universal binary build of Python contains object code for both PPC and i386
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and can therefore run at native speed on both classic powerpc based macs and
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the newer intel based macs.
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2. How do I build a universal binary
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------------------------------------
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You can enable universal binaries by specifying the "--enable-universalsdk"
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flag to configure::
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$ ./configure --enable-universalsdk
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$ make
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$ make install
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This flag can be used with a framework build of python, but also with a classic
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unix build. Either way you will have to build python on Mac OS X 10.4 (or later)
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with Xcode 2.1 (or later). You also have to install the 10.4u SDK when
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installing Xcode.
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2.1 Flavours of universal binaries
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..................................
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It is possible to build a number of flavours of the universal binary build,
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the default is a 32-bit only binary (i386 and ppc). The flavour can be
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specified using the option ``--with-universal-archs=VALUE``. The following
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values are available:
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* ``32-bit``: ``ppc``, ``i386``
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* ``64-bit``: ``ppc64``, ``x86_64``
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* ``all``: ``ppc``, ``ppc64``, ``i386``, ``x86_64``
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* ``3-way``: ``ppc``, ``i386`` and ``x86_64``
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* ``intel``: ``i386``, ``x86_64``
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To build a universal binary that includes a 64-bit architecture, you must build
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on a system running OSX 10.5 or later. The ``all`` flavour can only be built on
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OSX 10.5.
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The makefile for a framework build will install ``python32`` and ``pythonw32``
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binaries when the universal architecures includes at least one 32-bit architecture
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(that is, for all flavours but ``64-bit``).
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Running a specific archicture
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.............................
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You can run code using a specific architecture using the ``arch`` command::
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$ arch -i386 python
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Or to explicitly run in 32-bit mode, regardless of the machine hardware::
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$ arch -i386 -ppc python
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NOTE: When you're using a framework install of Python this requires at least
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Python 2.7 or 3.2, in earlier versions the python (and pythonw) commands are
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wrapper tools that execute the real interpreter without ensuring that the
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real interpreter runs with the same architecture.
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Building and using a framework-based Python on Mac OS X.
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========================================================
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1. Why would I want a framework Python instead of a normal static Python?
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--------------------------------------------------------------------------
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The main reason is because you want to create GUI programs in Python. With the
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exception of X11/XDarwin-based GUI toolkits all GUI programs need to be run
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from a fullblown MacOSX application (a ".app" bundle).
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While it is technically possible to create a .app without using frameworks you
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will have to do the work yourself if you really want this.
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A second reason for using frameworks is that they put Python-related items in
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only two places: "/Library/Framework/Python.framework" and
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"/Applications/MacPython <VERSION>" where ``<VERSION>`` can be e.g. "2.6",
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"3.1", etc.. This simplifies matters for users installing
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Python from a binary distribution if they want to get rid of it again. Moreover,
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due to the way frameworks work a user without admin privileges can install a
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binary distribution in his or her home directory without recompilation.
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2. How does a framework Python differ from a normal static Python?
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------------------------------------------------------------------
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In everyday use there is no difference, except that things are stored in
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a different place. If you look in /Library/Frameworks/Python.framework
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you will see lots of relative symlinks, see the Apple documentation for
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details. If you are used to a normal unix Python file layout go down to
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Versions/Current and you will see the familiar bin and lib directories.
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3. Do I need extra packages?
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----------------------------
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Yes, probably. If you want Tkinter support you need to get the OSX AquaTk
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distribution, this is installed by default on Mac OS X 10.4 or later. If
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you want wxPython you need to get that. If you want Cocoa you need to get
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PyObjC.
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4. How do I build a framework Python?
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-------------------------------------
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This directory contains a Makefile that will create a couple of python-related
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applications (fullblown OSX .app applications, that is) in
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"/Applications/MacPython <VERSION>", and a hidden helper application Python.app
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inside the Python.framework, and unix tools "python" and "pythonw" into
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/usr/local/bin. In addition it has a target "installmacsubtree" that installs
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the relevant portions of the Mac subtree into the Python.framework.
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It is normally invoked indirectly through the main Makefile, as the last step
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in the sequence
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1. ./configure --enable-framework
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2. make
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3. make install
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This sequence will put the framework in /Library/Framework/Python.framework,
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the applications in "/Applications/MacPython <VERSION>" and the unix tools in
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/usr/local/bin.
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Installing in another place, for instance $HOME/Library/Frameworks if you have
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no admin privileges on your machine, has only been tested very lightly. This
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can be done by configuring with --enable-framework=$HOME/Library/Frameworks.
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The other two directories, "/Applications/MacPython-<VERSION>" and
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/usr/local/bin, will then also be deposited in $HOME. This is sub-optimal for
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the unix tools, which you would want in $HOME/bin, but there is no easy way to
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fix this right now.
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If you want to install some part, but not all, read the main Makefile. The
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frameworkinstall is composed of a couple of sub-targets that install the
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framework itself, the Mac subtree, the applications and the unix tools.
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There is an extra target frameworkinstallextras that is not part of the
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normal frameworkinstall which installs the Tools directory into
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"/Applications/MacPython <VERSION>", this is useful for binary
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distributions.
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What do all these programs do?
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===============================
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"IDLE.app" is an integrated development environment for Python: editor,
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debugger, etc.
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"PythonLauncher.app" is a helper application that will handle things when you
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double-click a .py, .pyc or .pyw file. For the first two it creates a Terminal
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window and runs the scripts with the normal command-line Python. For the
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latter it runs the script in the Python.app interpreter so the script can do
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GUI-things. Keep the "alt" key depressed while dragging or double-clicking a
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script to set runtime options. These options can be set once and for all
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through PythonLauncher's preferences dialog.
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The commandline scripts /usr/local/bin/python and pythonw can be used to run
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non-GUI and GUI python scripts from the command line, respectively.
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How do I create a binary distribution?
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======================================
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Go to the directory "Mac/OSX/BuildScript". There you'll find a script
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"build-installer.py" that does all the work. This will download and build
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a number of 3rd-party libaries, configures and builds a framework Python,
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installs it, creates the installer package files and then packs this in a
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DMG image.
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The script will build a universal binary, you'll therefore have to run this
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script on Mac OS X 10.4 or later and with Xcode 2.1 or later installed.
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All of this is normally done completely isolated in /tmp/_py, so it does not
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use your normal build directory nor does it install into /.
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Because of the way the script locates the files it needs you have to run it
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from within the BuildScript directory. The script accepts a number of
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command-line arguments, run it with --help for more information.
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Configure warnings
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==================
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The configure script sometimes emits warnings like the one below::
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configure: WARNING: libintl.h: present but cannot be compiled
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configure: WARNING: libintl.h: check for missing prerequisite headers?
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configure: WARNING: libintl.h: see the Autoconf documentation
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configure: WARNING: libintl.h: section "Present But Cannot Be Compiled"
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configure: WARNING: libintl.h: proceeding with the preprocessor's result
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configure: WARNING: libintl.h: in the future, the compiler will take precedence
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configure: WARNING: ## -------------------------------------- ##
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configure: WARNING: ## Report this to http://bugs.python.org/ ##
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configure: WARNING: ## -------------------------------------- ##
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This almost always means you are trying to build a universal binary for
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Python and have libaries in ``/usr/local`` that don't contain the required
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architectures. Temporarily move ``/usr/local`` aside to finish the build.
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Uninstalling a framework install, including the binary installer
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================================================================
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Uninstalling a framework can be done by manually removing all bits that got installed.
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That's true for both installations from source and installations using the binary installer.
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Sadly enough OSX does not have a central uninstaller.
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The main bit of a framework install is the framework itself, installed in
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``/Library/Frameworks/Python.framework``. This can contain multiple versions
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of Python, if you want to remove just one version you have to remove the
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version-specific subdirectory: ``/Library/Frameworks/Python.framework/Versions/X.Y``.
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If you do that, ensure that ``/Library/Frameworks/Python.framework/Versions/Current``
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is a symlink that points to an installed version of Python.
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A framework install also installs some applications in ``/Applications/Python X.Y``,
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And lastly a framework installation installs files in ``/usr/local/bin``, all of
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them symbolic links to files in ``/Library/Frameworks/Python.framework/Versions/X.Y/bin``.
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Odds and ends
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=============
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Something to take note of is that the ".rsrc" files in the distribution are
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not actually resource files, they're AppleSingle encoded resource files. The
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macresource module and the Mac/OSX/Makefile cater for this, and create
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".rsrc.df.rsrc" files on the fly that are normal datafork-based resource
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files.
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Jack Jansen, Jack.Jansen@cwi.nl, 15-Jul-2004.
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Ronald Oussoren, RonaldOussoren@mac.com, 30-April-2010
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