[Buildroot] [git commit] host-python{, 3}: fix parallel install of libpython
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Wed Mar 5 18:45:24 UTC 2014
commit: http://git.buildroot.net/buildroot/commit/?id=6c94ab3cfd59c29ed27160ebd9759aea6a3fe58a
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master
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: $(HOST_DIR)/usr/lib/libpython3.4m.so.1.0: file too short
The fix is simple: use RUNPATH instead of RPATH, which allows
LD_LIBRARY_PATH to override RUNPATH. That way, the libpython in the
build directory is always used. RUNPATH is enabled by passing
--enable-new-dtags to the linker.
Fixes e.g.
http://autobuild.buildroot.net/results/2a6/2a62de3247ba5ad273f03d01e690a3eeb11aa7b4
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
package/python/python.mk | 6 ++++++
package/python3/python3.mk | 6 ++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/package/python/python.mk b/package/python/python.mk
index 94765cb..216448e 100644
--- a/package/python/python.mk
+++ b/package/python/python.mk
@@ -34,6 +34,12 @@ HOST_PYTHON_CONF_OPT += \
--disable-ssl \
--disable-pyo-build
+# Make sure that LD_LIBRARY_PATH overrides -rpath.
+# This is needed because libpython may be installed at the same time that
+# python is called.
+HOST_PYTHON_CONF_ENV += \
+ LDFLAGS="$(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
diff --git a/package/python3/python3.mk b/package/python3/python3.mk
index 880b66e..3d95a6d 100644
--- a/package/python3/python3.mk
+++ b/package/python3/python3.mk
@@ -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
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