[Python-Dev] Undefined dlopen When Building Module On Android

[Brett Cannon]

A mobile SIG is being formed, but it doesn't have a mailing list yet, else
that would be a good place to ask this question.

On Wed Jan 21 2015 at 5:54:39 PM Guido van Rossum <guido at python.org> wrote:

> Maybe try a list focused on Android development? Few people in the Python
> core development community have any Android experience. But the issues and
> context you offer seem to be related to the Android world, not to Python.
> (dlopen is used by a lot of systems, not just Python.)
>
> On Wed, Jan 21, 2015 at 2:43 PM, Cyd Haselton <chaselton at gmail.com> wrote:
>
>> On Mon, Jan 19, 2015 at 5:23 PM, Cyd Haselton <chaselton at gmail.com>
>> wrote:
>> > On Mon, Jan 19, 2015 at 8:51 AM, Cyd Haselton <chaselton at gmail.com>
>> wrote:
>> >> Hello,
>> >> I'm struggling with a build issue on Android; I've posted to the
>> >> general python list with no result, so I'm re-posting here in hopes
>> >> that someone can help.  If this is the wrong place feel free to let me
>> >> know.
>> >>
>> >> I'm attempting to build Python 2.7.8 on my Android device; I'm using
>> >> an environment that simulates a Linux filesystem within the Android
>> >> terminal using a port of fakechroot.  Within that environment I've
>> >> ported and/or bootstrapped a number of Linux utilities (curl, git,
>> >> openssl, gcc)
>> >>
>> >> I run ./configure, then make, and the executable and library are
>> >> built.  The problem occurs when build_ext is run; the newly built
>> >> python executable builds, then links _struct, and immediately
>> >> afterwards I get an 'undefined reference to dlopen' error.
>> >>
>> >> If I run ./python setup.py --verbose -library-dirs /path/to/lib
>> >> --libraries='c dl m' -f, the 'undefined reference to dlopen' error is
>> >> thrown again.
>> >>
>> >> If I run ./python setup.py --verbose -library-dirs /path/to/lib
>> >> --libraries='-lc -ldl -lm' -f the build continues past _struct...even
>> >> though ld throws the expected 'unable to find -l-lc' and other errors.
>> >>
>> >> Let me know if you need me to provide additional information.  Any
>> >> help would be greatly appreciated.
>> >>
>> >> Cyd
>> >
>> >
>> > Additionally I took a strace of the error producing command. The
>> > following is (hopefully) a relevant portion minus the various 'no such
>> > file' lines before the correct lib is found (which it always is)
>> >
>> > 16513
>> open("/data/data/jackpal.androidterm/kbox2/bld/python/Python-2.7.8/Lib/distutils/unixccompiler.py",
>> > O_RDONLY|O_LARGEFILE) = 3           16513
>> >
>> open("/data/data/jackpal.androidterm/kbox2/bld/python/Python-2.7.8/Lib/distutils/unixccompiler.pyc",
>> > O_RDONLY|O_LARGEFILE) = 4       16513 vfork()
>> >  = 16525
>> > 16513 wait4(16525,  <unfinished ...>
>> > 16525 open("/data/data/jackpal.androidterm/kbox2/bin/sh",
>> > O_RDONLY|O_LARGEFILE) = 3
>> > 16525 execve("/data/data/jackpal.androidterm/kbox2/bin/sh", ["sh",
>> > "-c", "gcc --sysroot=/usr/gcc-4.9.2/sysroot -print-multiarch >
>> > build/temp.linux-armv7l-2.7/multiarch 2> /dev/null"], [/* 58 vars */])
>> > = 0
>> >
>> > *snip call to libc intercepted by libfakechroot*
>> >
>> > 16525 open("/system/lib/libc.so", O_RDONLY|O_LARGEFILE|0x80000) = 3
>> > 16525 open("/system/lib/libm.so", O_RDONLY|O_LARGEFILE|0x80000) = 3
>> > 16525 open("/dev/__properties__",
>> > O_RDONLY|O_LARGEFILE|O_NOFOLLOW|0x80000) = 3
>> > 16525 open("build/temp.linux-armv7l-2.7/multiarch",
>> > O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 3
>> > 16525 open("/data/data/jackpal.androidterm/kbox2/dev/null",
>> > O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 3
>> > 16525 fork()                            = 16526
>> > 16525 wait4(-1,  <unfinished ...>
>> > 16526 open("/acct/uid/10186/tasks", O_RDWR|O_CREAT|O_LARGEFILE, 0666)
>> > = -1 EACCES (Permission denied)
>> >
>> > See attached for remainder
>>
>> Should I be posting this issue elsewhere?
>> Is more information needed?
>>
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>
>
> --
> --Guido van Rossum (python.org/~guido)
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