Commit 6c94ab3c authored Mar 05, 2014 by Arnout Vandecappelle Committed by Thomas Petazzoni Mar 05, 2014

host-python{, 3}: fix parallel install of libpython

During installation, host-python and host-python3 run the freshly built
python executable. This is done with a proper LD_LIBRARY_PATH to make
sure it picks up the libpython in the build directory. However, the
python binary has an RPATH pointing to the $(HOST_DIR)/usr/lib.
Therefore, if libpython exists there, it will be used instead.

If the install step is run in parallel, it is possible that libpython
is already partially copied to $(HOST_DIR)/usr/lib when python is run.
This gives an error like:

python: error while loading shared libraries: $(HOST_DIR)/usr/lib/libpython3.4m.so.1.0: file too short

The fix is simple: use RUNPATH instead of RPATH, which allows
LD_LIBRARY_PATH to override RUNPATH. That way, the libpython in the
build directory is always used. RUNPATH is enabled by passing
--enable-new-dtags to the linker.

Fixes e.g.
http://autobuild.buildroot.net/results/2a6/2a62de3247ba5ad273f03d01e690a3eeb11aa7b4



Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

parent e640872e

package/python/python.mk

+6 −0

Original line number	Diff line number	Diff line
		@@ -34,6 +34,12 @@ HOST_PYTHON_CONF_OPT += \
		--disable-ssl \
		--disable-pyo-build

		# Make sure that LD_LIBRARY_PATH overrides -rpath.
		# This is needed because libpython may be installed at the same time that
		# python is called.
		HOST_PYTHON_CONF_ENV += \
		LDFLAGS="$(HOST_LDFLAGS) -Wl,--enable-new-dtags"

		# Building host python in parallel sometimes triggers a "Bus error"
		# during the execution of "./python setup.py build" in the
		# installation step. It is probably due to the installation of a

package/python3/python3.mk

+6 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,12 @@ HOST_PYTHON3_CONF_OPT += \
		--disable-idle3 \
		--disable-pyo-build

		# Make sure that LD_LIBRARY_PATH overrides -rpath.
		# This is needed because libpython may be installed at the same time that
		# python is called.
		HOST_PYTHON3_CONF_ENV += \
		LDFLAGS="$(HOST_LDFLAGS) -Wl,--enable-new-dtags"

		PYTHON3_DEPENDENCIES = host-python3 libffi

		HOST_PYTHON3_DEPENDENCIES = host-expat host-zlib