[yocto] Python cryptography failing due to undefined symbol: pthread_atfork

[Tim Orling]

My hunch (not tested) is that the recipe needs -pthread added to LDSHARED:
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/classes/distutils.bbclass#n82

So try a python3-cryptography_%.bbappend file with “export
LDSHARED="${CCLD} -shared -pthread” in your own layer

Or try adding that line to python-cryptography.inc and then submit a patch
if it works.
On Fri, Dec 22, 2017 at 9:10 AM Alan Martinovic <alan.martinovic at senic.com>
wrote:

> I have confirmed that no `-pthread` flags are being set for building
> python-cryptography.
>
> Running the following:
>
>     bitbake python-cryptography -c do_compile
>     bitbake python-cryptography -c devshell
>     grep pthread ../temp/run.do_compile
>
> gives no returns.
> Also there isn't a mention of it when doing a build in full
> verbose:
>
>     bitbake python-cryptography -c cleanall
>     bitbake python-cryptography -vvv | vi -
>
>
> On the target the symbol is identified as missing (NOTYPE):
>
>     ~# readelf -a
> /usr/lib/python3.5/site-packages/cryptography/hazmat/bindings/_
> openssl.abi3.so
> | grep pthread_atfork
>     000aebb4  0002d916 R_ARM_JUMP_SLOT   00000000   pthread_atfork
>        729: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND pthread_atfork
>
>
> My current goal is to extend the recipe with the `-pthread` so that
> it's there when
> the '_openssl' extension is being built.
> Still open to suggestions.
>
>
> A thing that seems to be underlying my assumption is that the recipe
> for python-cryptography
> hasn't actually changed between Morty (where it worked) and Rocko...
>
> On Thu, Dec 21, 2017 at 6:17 PM, Alan Martinovic
> <alan.martinovic at senic.com> wrote:
> > Hi there,
> > just did a migration to Rocko and am witnessing"
> >
> >     root at device:~# python3
> >     Python 3.5.3 (default, Dec 20 2017, 02:02:22)
> >     [GCC 7.2.0] on linux
> >     Type "help", "copyright", "credits" or "license" for more
> information.
> >     >>> from cryptography.hazmat.bindings._openssl import ffi, lib
> >     Traceback (most recent call last):
> >       File "<stdin>", line 1, in <module>
> >     ImportError:
> > /usr/lib/python3.5/site-packages/cryptography/hazmat/bindings/_
> openssl.abi3.so:
> > undefined symbol: pthread_atfork
> >
> >
> > Have tried both the recipe that comes with Rocko
> > and master of meta-openembedded.
> >
> > Seems to be the same bug as this one:
> >
> > https://bugs.gentoo.org/630578
> >
> > resolved with this patch:
> >
> >
> https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c824d1c44fcf4556de21d2c8b8ae3732b0fc0c5b
> >
> > Can someone provide hints on what would that translate to
> >  for the python cryptography recipe?
> --
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