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

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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>
This commit is contained in:
Arnout Vandecappelle 2014-03-05 00:29:49 +01:00 committed by Thomas Petazzoni
parent e640872eb0
commit 6c94ab3cfd
2 changed files with 12 additions and 0 deletions
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6
package/python/python.mk
View File

@ -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

6
package/python3/python3.mk
View File

@ -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