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package/gstreamer1/gst1-python: fix libpython-dir path

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Due to the CONF_ENV options set in the gst1-python.mk file, libpython-dir
must be set manually or else the error:
"Python dynamic library path could not be determined" occurs.

Previously the libpython-dir option was set to
$(HOST_DIR)/lib/python$(PYTHON3_VERSION_MAJOR), however, this breaks the
resulting .so because the above full path is baked into the resulting .so.
which results in the error:

Couldn't g_module_open libpython. Reason:
/full/path/to/host/lib/python3.8/libpython3.8.so: cannot open shared object
file: No such file or directory

To fix this error, set the libpython-dir to /usr/lib.
Because we provide PYTHONPATH=$(PYTHON3_PATH) in the GST1_PYTHON_CONF_ENV,
the logic in the meson file uses the above python3 provided by the PYTHONPATH
variable to determine /usr/lib/ has the proper
python$(PYTHON3_VERSION_MAJOR).so file.

Because Buildroot provides the appropriate paths, the meson file finds
the correct .so file and the resulting compiled library has the appropriate
path of /usr/lib/python3.$(PYTHON3_VERSION_MAJOR).so

This change has been tested on the following distributions:
  - Debian 9 and 10
  - Debian 9 without python3 installed on the host.
  - Centos7
  - Fedora 31

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Adam Duskett 2020-03-24 10:38:52 -07:00 committed by Yann E. MORIN
parent 86cd05b675
commit e3053f2176
1 changed files with 9 additions and 3 deletions
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12
package/gstreamer1/gst1-python/gst1-python.mk
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@ -23,10 +23,16 @@ GST1_PYTHON_CONF_ENV += \
_PYTHON_SYSCONFIGDATA_NAME=$(PKG_PYTHON_SYSCONFIGDATA_NAME) \ _PYTHON_SYSCONFIGDATA_NAME=$(PKG_PYTHON_SYSCONFIGDATA_NAME) \
PYTHONPATH=$(PYTHON3_PATH) PYTHONPATH=$(PYTHON3_PATH)
# Due to the CONF_ENV options, libpython-dir must be set to the host directory # Due to the CONF_ENV options, libpython-dir must be set manually
# or else the error: "Python dynamic library path could not be determined" # or else the error: "Python dynamic library path could not be determined"
# will occure # occurs. We set the libpython-dir to /usr/lib as this path is hard-coded
# into the resulting .so file as /usr/lib/python3.$(PYTHON3_VERSION_MAJOR).so.
# Because we provide PYTHONPATH=$(PYTHON3_PATH) above, the logic in the meson
# file uses the above python path to determine if /usr/lib/ has the proper .so
# file. Because Buildroot provides the appropriate paths, the meson file finds
# the correct .so file, and the resulting compiled library has the appropriate
# path of /usr/lib/python3.$(PYTHON3_VERSION_MAJOR).so
GST1_PYTHON_CONF_OPTS += \ GST1_PYTHON_CONF_OPTS += \
-Dlibpython-dir=$(HOST_DIR)/lib/python$(PYTHON3_VERSION_MAJOR) -Dlibpython-dir=/usr/lib/
$(eval $(meson-package)) $(eval $(meson-package))