buildroot

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.ac by

adding values to the DISABLED_EXTENSIONS variable (which is a

word-separated list of extensions).

​

The implementation works as follow :

​

 * configure.ac 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 <ripard@archos.com>, and

then extended by Thomas Petazzoni

<thomas.petazzoni@free-electrons.com>.

​

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

---

 Makefile.pre.in |    4 ++++

 configure.ac    |    2 ++

 setup.py        |    5 ++++-

 3 files changed, 10 insertions(+), 1 deletion(-)

​

Index: b/Makefile.pre.in

===================================================================

--- a/Makefile.pre.in

+++ b/Makefile.pre.in

@@ -175,6 +175,8 @@

 # configure script arguments

 CONFIG_ARGS=   @CONFIG_ARGS@

+# disabled extensions

+DISABLED_EXTENSIONS=   @DISABLED_EXTENSIONS@

 # Subdirectories with code

 SRCDIRS=   @SRCDIRS@

@@ -561,6 +563,7 @@

    esac; \

    $(RUNSHARED) CC='$(CC)' LDSHARED='$(BLDSHARED)' OPT='$(OPT)' \

        _TCLTK_INCLUDES='$(TCLTK_INCLUDES)' _TCLTK_LIBS='$(TCLTK_LIBS)' \

+       DISABLED_EXTENSIONS="$(DISABLED_EXTENSIONS)" \

        $(PYTHON_FOR_BUILD) $(srcdir)/setup.py $$quiet build

 # Build static library

@@ -1371,7 +1374,8 @@

 # Install the dynamically loadable modules