Add infrastructure to disable the build of certain extensions Some of the extensions part of the Python core have dependencies on external libraries (sqlite, tk, etc.) or are relatively big and not necessarly always useful (CJK codecs for example). By extensions, we mean part of Python modules that are written in C and therefore compiled to binary code. Therefore, we introduce a small infrastructure that allows to disable some of those extensions. This can be done inside the configure.in by adding values to the DISABLED_EXTENSIONS variable (which is a word-separated list of extensions). The implementation works as follow : * configure.in defines a DISABLED_EXTENSIONS variable, which is substituted (so that when Makefile.pre is generated from Makefile.pre.in, the value of the variable is substituted). For now, this DISABLED_EXTENSIONS variable is empty, later patches will use it. * Makefile.pre.in passes the DISABLED_EXTENSIONS value down to the variables passed in the environment when calling the setup.py script that actually builds and installs those extensions. * setup.py is modified so that the existing "disabled_module_list" is filled with those pre-disabled extensions listed in DISABLED_EXTENSIONS. Patch ported to python2.7 by Maxime Ripard , and then extended by Thomas Petazzoni . Signed-off-by: Thomas Petazzoni --- Makefile.pre.in | 8 +++++--- configure.in | 2 ++ setup.py | 5 ++++- 3 files changed, 11 insertions(+), 4 deletions(-) Index: Python-2.7.1/Makefile.pre.in =================================================================== --- Python-2.7.1.orig/Makefile.pre.in +++ Python-2.7.1/Makefile.pre.in @@ -141,6 +141,8 @@ # configure script arguments CONFIG_ARGS= @CONFIG_ARGS@ +# disabled extensions +DISABLED_EXTENSIONS= @DISABLED_EXTENSIONS@ # Subdirectories with code SRCDIRS= @SRCDIRS@ @@ -406,8 +408,8 @@ # Build the shared modules sharedmods: $(BUILDPYTHON) @case $$MAKEFLAGS in \ - *s*) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' CROSS_COMPILING=@CROSS_COMPILING@ $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py -q build;; \ - *) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' CROSS_COMPILING=@CROSS_COMPILING@ $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py build;; \ + *s*) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' CROSS_COMPILING=@CROSS_COMPILING@ DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py -q build;; \ + *) $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' CROSS_COMPILING=@CROSS_COMPILING@ DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py build;; \ esac # Build static library @@ -1046,7 +1048,7 @@ # Install the dynamically loadable modules # This goes into $(exec_prefix) sharedinstall: sharedmods - $(RUNSHARED) CROSS_COMPILING=@CROSS_COMPILING@ $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py install \ + $(RUNSHARED) CROSS_COMPILING=@CROSS_COMPILING@ DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" $(PYTHON_FOR_BUILD) -E $(srcdir)/setup.py install \ --prefix=$(prefix) \ --install-scripts=$(BINDIR) \ --install-platlib=$(DESTSHARED) \ Index: Python-2.7.1/configure.in =================================================================== --- Python-2.7.1.orig/configure.in +++ Python-2.7.1/configure.in @@ -2084,6 +2084,8 @@ AC_PATH_TOOL([PKG_CONFIG], [pkg-config]) +AC_SUBST(DISABLED_EXTENSIONS) + # Check for use of the system expat library AC_MSG_CHECKING(for --with-system-expat) AC_ARG_WITH(system_expat, Index: Python-2.7.1/setup.py =================================================================== --- Python-2.7.1.orig/setup.py +++ Python-2.7.1/setup.py @@ -21,7 +21,10 @@ COMPILED_WITH_PYDEBUG = hasattr(sys, 'gettotalrefcount') # This global variable is used to hold the list of modules to be disabled. -disabled_module_list = [] +try: + disabled_module_list = sysconfig.get_config_var("DISABLED_EXTENSIONS").split(" ") +except KeyError: + disabled_module_list = list() def add_dir_to_list(dirlist, dir): """Add the directory 'dir' to the list 'dirlist' (at the front) if