#41874: Exempi patch causes python ctypes problem, relates to ticket 20965 -------------------------------+-------------------------------- Reporter: john.g.evans.ne@… | Owner: macports-tickets@… Type: defect | Status: new Priority: Normal | Milestone: Component: ports | Version: 2.2.1 Keywords: | Port: exempi -------------------------------+-------------------------------- When trying to access the exempi library via python's ctypes module, the following error is seen {{{
import ctypes c = ctypes.CDLL('/opt/local/lib/libexempi.dylib') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 365, in __init__ self._handle = _dlopen(self._name, mode) OSError: dlopen(/opt/local/lib/libexempi.dylib, 6): Symbol not found: __Z16ConvertToMacLangRKSstPSs Referenced from: /opt/local/lib/libexempi.dylib Expected in: flat namespace in /opt/local/lib/libexempi.dylib }}}
This does not happen when exempi is compiled from source. The symbol being referenced is the `ConvertToMacLang` function, which is defined in exempi's `Quicktime_Support.cpp` file, and exempi's portfile excludes this file from the library (as applied by the 3rd of three patches) {{{ # see http://trac.macports.org/ticket/20965 if {${build_arch} eq "x86_64" || ${build_arch} eq "ppc64"} { patchfiles-append patch- source__XMPFiles__FormatSupport__Makefile.am configure.cppflags-append -DXMP_64 } }}} However, `ConvertToMacLang` is called in another exempi file, so the symbol is still there and listed as undefined when `nm` is used on the library. {{{ nm /opt/local/lib/libexempi.dylib | grep ConvertToMac U __Z16ConvertToMacLangRKSstPSs }}} When looking over the history of ticket #20965, it looks to me like the original issue that the ticket tries to resolve has actually been resolved upstream by the exempi maintainer (see exempi bug #58175 at https://bugs.freedesktop.org/show_bug.cgi?id=58175 ). When the above portfile stanza is removed and exempi recompiled and reinstalled with only the first two patches applied, python can then load the library via ctypes. Have tested this on snow leopard, lion, and mavericks. -- Ticket URL: <https://trac.macports.org/ticket/41874> MacPorts <http://www.macports.org/> Ports system for OS X