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I'm trying to cross-compile python with zlib support.

What I did and what is working:

  • Downloaded Python source code (Python-3.6.5)
  • Compiled zlib from Python folder:
#!/bin/sh

# Path to angstrom cross-compiler
CROSS_COMPILE=/home/angstrom/arm/bin

CC=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-gcc CXX=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-g++ AR=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ar LD=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ld \
        RANLIB=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ranlib \
    ./configure \
    --prefix=$HOME/python \
    --enable-shared
  • Copied compiled zlib library files to angstrom compiler location, just to be sure it is found.
  • Configure Python:
#!/bin/sh

# Path to angstrom bin folder
CROSS_COMPILE=/home/angstrom/arm/bin

CC=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-gcc CXX=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-g++ AR=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ar LD=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ld \
        RANLIB=$CROSS_COMPILE/arm-angstrom-linux-gnueabi-ranlib \
    ./configure --host=arm-angstrom-linux --target=arm-angstrom-linux-gnueabi \
    --build=x86_64-linux-gnu --prefix=$HOME/python \
    READELF==arm-angstrom-linux-gnueabi-readelf \
    --disable-ipv6 ac_cv_file__dev_ptmx=no ac_cv_file__dev_ptc=no \
    ac_cv_have_long_long_format=yes --enable-shared
  • Activate zlib in Modules/Setup like discussed here.
  • make & make install
#!/bin/sh

# Path to angstrom bin folder
CROSS_COMPILE=/home/toolchain/angstrom/arm/bin

make HOSTPYTHON=$HOME/python \
BLDSHARED="$CROSS_COMPILE/arm-angstrom-linux-gnueabi-gcc -shared" CROSS-COMPILE=arm-angstrom-linux-gnueabihf- \
CROSS_COMPILE_TARGET=yes HOSTARCH=arm-angstrom-linux BUILDARCH=arm-angstrom-linux-gnueabihf

make altinstall HOSTPYTHON=$HOME/python \
BLDSHARED="$CROSS_COMPILE/arm-angstrom-linux-gnueabi-gcc -shared" CROSS-COMPILE=arm-angstrom-linux-gnueabihf- \
CROSS_COMPILE_TARGET=yes HOSTARCH=arm-angstrom-linux BUILDARCH=arm-angstrom-linux-gnueabihf \
prefix=$HOME/python

The output of the make process states zlib was not compiled:

Python build finished successfully!
The necessary bits to build these optional modules were not found:
_bz2                  _curses               _curses_panel
_dbm                  _gdbm                 _lzma
_sqlite3              _ssl                  _tkinter
readline              zlib
To find the necessary bits, look in setup.py in detect_modules() for the module's name.

Copying the compiled modules to the arm device, shows Python working but without zlib support.

Marcus
  • 11
  • 2

1 Answers1

2

Python will detect zlib and other dependencies in setup.py. Before detecting, it will search for valid include dirs and library dirs in CPPFLAGS and LDFLAGS. So try set CPPFLAGS and LDFLAGS like below while configuring Python:

CC=blah CXX=blah AR=blah LD=blah RANLIB=blah \
CPPFLAGS="-I$HOME/python/include" LDFLAGS="-L$HOME/python/lib" \
    ./configure blahblah
Richard Chien
  • 81
  • 1
  • 7