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kumquat-buildroot/package/python3/python3.mk
Thomas Petazzoni 4b6e8f010a package/pkg-python: fix for per-package directories 
With per-package directory support, Python external modules are
causing a problem: the _sysconfigdata.py module installed by the
Python interpreter contains a number of paths that are relative to the
current package per-package directory, i.e python or python3. For
example:

'BLDSHARED': '/home/thomas/projets/buildroot/output/per-package/python/host/bin/arm-linux-gcc -shared',
'CC': '/home/thomas/projets/buildroot/output/per-package/python/host/bin/arm-linux-gcc',
'CXX': '/home/thomas/projets/buildroot/output/per-package/python/host/bin/arm-linux-g++',
etc.

These paths are problematic, because it means that the wrong compiler
gets used when building external Python modules: instead of using the
compiler from the external Python module per-package host directory,
it uses the one from the 'python' or 'python3' per-package host
directory. Due to this, any native dependency needed by the external
Python module is not found, even though it is properly present in the
current package per-package directory.

Of course, the problem occurs with both target Python modules and host
Python modules.

To fix this, we simply rewrite those paths in _sysconfigdata.py before
building a Python package.

Interestingly, until now, the _sysconfidata.py that was used during
the build was the one from $(TARGET_DIR), which is a bit unusual: it
is more common to use files from $(STAGING_DIR) during the build
process. So this commit changes the PYTHON_PATH and PYTHON3_PATH
variables so that they point to $(STAGING_DIR), which makes the
_sysconfigdata.py fixup in $(STAGING_DIR) effective.

Fixes:

  http://autobuild.buildroot.net/results/a24b0555fd4261b50dc3986635c30717d9cbe764/ (python-psycopg2)
  http://autobuild.buildroot.net/results/080fa893e1b0e7a8c8a31ac1c98eb8871b97264d/ (python-alsaaudio)
  http://autobuild.buildroot.net/results/79bc070f98d6d9d8ef78df12b248cdc7d0e405c3/ (python-lxml)
  and many more Python packages that use native code with a native library

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2020-02-18 23:16:15 +01:00

314 lines
9.8 KiB
Makefile
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################################################################################
#
# python3
#
################################################################################
PYTHON3_VERSION_MAJOR = 3.8
PYTHON3_VERSION = $(PYTHON3_VERSION_MAJOR).1
PYTHON3_SOURCE = Python-$(PYTHON3_VERSION).tar.xz
PYTHON3_SITE = https://python.org/ftp/python/$(PYTHON3_VERSION)
PYTHON3_LICENSE = Python-2.0, others
PYTHON3_LICENSE_FILES = LICENSE
# This host Python is installed in $(HOST_DIR), as it is needed when
# cross-compiling third-party Python modules.
HOST_PYTHON3_CONF_OPTS += \
--without-ensurepip \
--without-cxx-main \
--disable-sqlite3 \
--disable-tk \
--with-expat=system \
--disable-curses \
--disable-codecs-cjk \
--disable-nis \
--enable-unicodedata \
--disable-test-modules \
--disable-idle3 \
--disable-ossaudiodev
# Make sure that LD_LIBRARY_PATH overrides -rpath.
# This is needed because libpython may be installed at the same time that
# python is called.
# Make python believe we don't have 'hg', so that it doesn't try to
# communicate over the network during the build.
HOST_PYTHON3_CONF_ENV += \
LDFLAGS="$(HOST_LDFLAGS) -Wl,--enable-new-dtags" \
ac_cv_prog_HAS_HG=/bin/false
PYTHON3_DEPENDENCIES = host-python3 libffi
HOST_PYTHON3_DEPENDENCIES = host-expat host-zlib host-libffi
ifeq ($(BR2_PACKAGE_HOST_PYTHON3_SSL),y)
HOST_PYTHON3_DEPENDENCIES += host-openssl
else
HOST_PYTHON3_CONF_OPTS += --disable-openssl
endif
PYTHON3_INSTALL_STAGING = YES
ifeq ($(BR2_PACKAGE_PYTHON3_READLINE),y)
PYTHON3_DEPENDENCIES += readline
else
PYTHON3_CONF_OPTS += --disable-readline
endif
ifeq ($(BR2_PACKAGE_PYTHON3_CURSES),y)
PYTHON3_DEPENDENCIES += ncurses
else
PYTHON3_CONF_OPTS += --disable-curses
endif
ifeq ($(BR2_PACKAGE_PYTHON3_DECIMAL),y)
PYTHON3_DEPENDENCIES += mpdecimal
PYTHON3_CONF_OPTS += --with-libmpdec=system
else
PYTHON3_CONF_OPTS += --with-libmpdec=none
endif
ifeq ($(BR2_PACKAGE_PYTHON3_PYEXPAT),y)
PYTHON3_DEPENDENCIES += expat
PYTHON3_CONF_OPTS += --with-expat=system
else
PYTHON3_CONF_OPTS += --with-expat=none
endif
ifeq ($(BR2_PACKAGE_PYTHON3_SQLITE),y)
PYTHON3_DEPENDENCIES += sqlite
else
PYTHON3_CONF_OPTS += --disable-sqlite3
endif
ifeq ($(BR2_PACKAGE_PYTHON3_SSL),y)
PYTHON3_DEPENDENCIES += openssl
else
PYTHON3_CONF_OPTS += --disable-openssl
endif
ifneq ($(BR2_PACKAGE_PYTHON3_CODECSCJK),y)
PYTHON3_CONF_OPTS += --disable-codecs-cjk
endif
ifneq ($(BR2_PACKAGE_PYTHON3_UNICODEDATA),y)
PYTHON3_CONF_OPTS += --disable-unicodedata
endif
# Disable auto-detection of uuid.h (util-linux)
# which would add _uuid module support, instead
# default to the pure python implementation
PYTHON3_CONF_OPTS += --disable-uuid
ifeq ($(BR2_PACKAGE_PYTHON3_BZIP2),y)
PYTHON3_DEPENDENCIES += bzip2
else
PYTHON3_CONF_OPTS += --disable-bzip2
endif
ifeq ($(BR2_PACKAGE_PYTHON3_XZ),y)
PYTHON3_DEPENDENCIES += xz
else
PYTHON3_CONF_OPTS += --disable-xz
endif
ifeq ($(BR2_PACKAGE_PYTHON3_ZLIB),y)
PYTHON3_DEPENDENCIES += zlib
else
PYTHON3_CONF_OPTS += --disable-zlib
endif
ifeq ($(BR2_PACKAGE_PYTHON3_OSSAUDIODEV),y)
PYTHON3_CONF_OPTS += --enable-ossaudiodev
else
PYTHON3_CONF_OPTS += --disable-ossaudiodev
endif
# Make python believe we don't have 'hg', so that it doesn't try to
# communicate over the network during the build.
PYTHON3_CONF_ENV += \
ac_cv_have_long_long_format=yes \
ac_cv_file__dev_ptmx=yes \
ac_cv_file__dev_ptc=yes \
ac_cv_working_tzset=yes \
ac_cv_prog_HAS_HG=/bin/false
# GCC is always compliant with IEEE754
ifeq ($(BR2_ENDIAN),"LITTLE")
PYTHON3_CONF_ENV += ac_cv_little_endian_double=yes
else
PYTHON3_CONF_ENV += ac_cv_big_endian_double=yes
endif
# uClibc is known to have a broken wcsftime() implementation, so tell
# Python 3 to fall back to strftime() instead.
ifeq ($(BR2_TOOLCHAIN_USES_UCLIBC),y)
PYTHON3_CONF_ENV += ac_cv_func_wcsftime=no
endif
PYTHON3_CONF_OPTS += \
--without-ensurepip \
--without-cxx-main \
--with-system-ffi \
--disable-pydoc \
--disable-test-modules \
--disable-lib2to3 \
--disable-tk \
--disable-nis \
--disable-idle3 \
--disable-pyc-build
#
# Some of CPython's source code is generated using Python interpreter
# and some helper tools such as "Programs/_freeze_importlib" or
# "Parser/pgen" (look for regen-* targets in Makefile.pre.in for more
# info). Normally CPython codebase ships with those files
# pre-generated, so just regular "make" with no additional steps
# should be sufficient for a succesfull build, however due to
# Buildroot's "Add importlib fix for PEP 3147 issue" custom patch we
# end up modifying "Lib/importlib/_bootstrap_external.py" which means
# we have to do "regen-importlib" step before building CPython
# (Importlib is a builtin module that needs to be "frozen"/converted
# to a C array of bytecode using "Programs/_freeze_importlib")
#
# To achive that we add pre-build steps to host-python3 as well as
# python3 that execute "regen-importlib" target.
#
# Unfortunately, for the target Python, "Programs/_freeze_importlib"
# is built for the target, while we need to run them at build time. So
# when installing host-python3, we copy them to $(HOST_DIR)/bin...
#
define HOST_PYTHON3_MAKE_REGEN_IMPORTLIB
$(HOST_MAKE_ENV) $(PYTHON3_CONF_ENV) $(MAKE) $(HOST_CONFIGURE_OPTS) -C $(@D) regen-importlib
cp $(@D)/Programs/_freeze_importlib $(HOST_DIR)/bin/python-freeze-importlib
endef
HOST_PYTHON3_PRE_BUILD_HOOKS += HOST_PYTHON3_MAKE_REGEN_IMPORTLIB
#
# ... And then, when building the target python we first buid
# 'Programs/_freeze_importlib' to force GNU Make to update all of the
# prerequisites of 'Programs/_freeze_importlib', then copy our stashed
# "host-usable" version over the one that was just build and then
# build "regen-importlib" target
#
define PYTHON3_MAKE_REGEN_IMPORTLIB
$(TARGET_MAKE_ENV) $(PYTHON3_CONF_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) Programs/_freeze_importlib
cp $(HOST_DIR)/bin/python-freeze-importlib $(@D)/Programs/_freeze_importlib
$(TARGET_MAKE_ENV) $(PYTHON3_CONF_ENV) $(MAKE) $(TARGET_CONFIGURE_OPTS) -C $(@D) regen-importlib
endef
PYTHON3_PRE_BUILD_HOOKS += PYTHON3_MAKE_REGEN_IMPORTLIB
#
# Remove useless files. In the config/ directory, only the Makefile
# and the pyconfig.h files are needed at runtime.
#
define PYTHON3_REMOVE_USELESS_FILES
rm -f $(TARGET_DIR)/usr/bin/python$(PYTHON3_VERSION_MAJOR)-config
rm -f $(TARGET_DIR)/usr/bin/python$(PYTHON3_VERSION_MAJOR)m-config
rm -f $(TARGET_DIR)/usr/bin/python3-config
rm -f $(TARGET_DIR)/usr/bin/smtpd.py.3
for i in `find $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/config-$(PYTHON3_VERSION_MAJOR)m-*/ \
-type f -not -name Makefile` ; do \
rm -f $$i ; \
done
rm -rf $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/__pycache__/
rm -rf $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/lib-dynload/sysconfigdata/__pycache__
rm -rf $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/collections/__pycache__
rm -rf $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/importlib/__pycache__
endef
PYTHON3_POST_INSTALL_TARGET_HOOKS += PYTHON3_REMOVE_USELESS_FILES
#
# Make sure libpython gets stripped out on target
#
define PYTHON3_ENSURE_LIBPYTHON_STRIPPED
chmod u+w $(TARGET_DIR)/usr/lib/libpython$(PYTHON3_VERSION_MAJOR)*.so
endef
PYTHON3_POST_INSTALL_TARGET_HOOKS += PYTHON3_ENSURE_LIBPYTHON_STRIPPED
PYTHON3_AUTORECONF = YES
define PYTHON3_INSTALL_SYMLINK
ln -fs python3 $(TARGET_DIR)/usr/bin/python
endef
ifneq ($(BR2_PACKAGE_PYTHON),y)
PYTHON3_POST_INSTALL_TARGET_HOOKS += PYTHON3_INSTALL_SYMLINK
endif
# Some packages may have build scripts requiring python3, whatever is the
# python version chosen for the target.
# Only install the python symlink in the host tree if python3 is enabled
# for the target.
ifeq ($(BR2_PACKAGE_PYTHON3),y)
define HOST_PYTHON3_INSTALL_SYMLINK
ln -fs python3 $(HOST_DIR)/bin/python
ln -fs python3-config $(HOST_DIR)/bin/python-config
endef
HOST_PYTHON3_POST_INSTALL_HOOKS += HOST_PYTHON3_INSTALL_SYMLINK
endif
# Provided to other packages
PYTHON3_PATH = $(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/
# Support for socket.AF_BLUETOOTH
ifeq ($(BR2_PACKAGE_BLUEZ5_UTILS_HEADERS),y)
PYTHON3_DEPENDENCIES += bluez5_utils-headers
endif
$(eval $(autotools-package))
$(eval $(host-autotools-package))
ifeq ($(BR2_REPRODUCIBLE),y)
define PYTHON3_FIX_TIME
find $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR) -name '*.py' -print0 | \
xargs -0 --no-run-if-empty touch -d @$(SOURCE_DATE_EPOCH)
endef
endif
define PYTHON3_CREATE_PYC_FILES
$(PYTHON3_FIX_TIME)
PYTHONPATH="$(PYTHON3_PATH)" \
cd $(TARGET_DIR) && $(HOST_DIR)/bin/python$(PYTHON3_VERSION_MAJOR) \
$(TOPDIR)/support/scripts/pycompile.py \
$(if $(BR2_REPRODUCIBLE),--force) \
usr/lib/python$(PYTHON3_VERSION_MAJOR)
endef
ifeq ($(BR2_PACKAGE_PYTHON3_PYC_ONLY)$(BR2_PACKAGE_PYTHON3_PY_PYC),y)
PYTHON3_TARGET_FINALIZE_HOOKS += PYTHON3_CREATE_PYC_FILES
endif
ifeq ($(BR2_PACKAGE_PYTHON3_PYC_ONLY),y)
define PYTHON3_REMOVE_PY_FILES
find $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR) -name '*.py' \
$(if $(strip $(KEEP_PYTHON_PY_FILES)),-not \( $(call finddirclauses,$(TARGET_DIR),$(KEEP_PYTHON_PY_FILES)) \) ) \
-print0 | \
xargs -0 --no-run-if-empty rm -f
endef
PYTHON3_TARGET_FINALIZE_HOOKS += PYTHON3_REMOVE_PY_FILES
endif
# Normally, *.pyc files should not have been compiled, but just in
# case, we make sure we remove all of them.
ifeq ($(BR2_PACKAGE_PYTHON3_PY_ONLY),y)
define PYTHON3_REMOVE_PYC_FILES
find $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR) -name '*.pyc' -print0 | \
xargs -0 --no-run-if-empty rm -f
endef
PYTHON3_TARGET_FINALIZE_HOOKS += PYTHON3_REMOVE_PYC_FILES
endif
# In all cases, we don't want to keep the optimized .opt-1.pyc and
# .opt-2.pyc files, since they can't work without their non-optimized
# variant.
define PYTHON3_REMOVE_OPTIMIZED_PYC_FILES
find $(TARGET_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR) -name '*.opt-1.pyc' -print0 -o -name '*.opt-2.pyc' -print0 | \
xargs -0 --no-run-if-empty rm -f
endef
PYTHON3_TARGET_FINALIZE_HOOKS += PYTHON3_REMOVE_OPTIMIZED_PYC_FILES
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