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

I guess I'll keep waiting...given the zero responses I've gotten from the android side. :-(. In the meantime...in case anyone is interested... since I have the working binary, I executed it and went through each command in setup.py to see what throws the 'undefined reference to dlopen' error. Turns out that the distutils module is the culprit...specifically distutils.core. On Thu, Jan 22, 2015 at 8:33 AM, Brett Cannon wrote:

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 wrote:

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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 wrote:

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On Mon, Jan 19, 2015 at 5:23 PM, Cyd Haselton wrote:

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On Mon, Jan 19, 2015 at 8:51 AM, Cyd Haselton wrote:

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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, 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, 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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