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From: Marcus von Appen <mva@freebsd.org>
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Subject: cmake python detection gets confused if multiple python versions
are installed
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>Submitter-Id: current-users
>Originator: Marcus von Appen
>Organization:
>Confidential: no
>Synopsis: cmake python detection gets confused if multiple python versions are installed
>Severity: non-critical
>Priority: medium
>Category: ports
>Class: sw-bug
>Release: FreeBSD 9.0-STABLE amd64
>Environment:
System: FreeBSD medusa.sysfault.org 9.0-STABLE FreeBSD 9.0-STABLE #0: Mon May 14 15:08:44 CEST 2012 root@medusa.sysfault.org:/usr/obj/usr/src/sys/MEDUSA amd64
>Description:
If multiple Python versions are installed, cmake's
find_host_package(PythonInterp) and
find_host_package(PythonLibs) statements may return different
Python versions, causing cmake to try to detect and link
against the wrong Python default version
>How-To-Repeat:
Install lang/python27, lang/python31, lang/python
Try to configure and build graphics/py-opencv:
[...]
root@medusa:/usr/ports/graphics/py-opencv # make configure
===> License BSD accepted by the user
===> Extracting for py27-opencv-2.3.1_3
=> SHA256 Checksum OK for OpenCV-2.3.1a.tar.bz2.
===> Patching for py27-opencv-2.3.1_3
===> Applying extra patch /usr/ports/graphics/py-opencv/../opencv/files/extra-patch-opencv-python
===> Applying FreeBSD patches for py27-opencv-2.3.1_3
===> py27-opencv-2.3.1_3 depends on file: /usr/local/lib/python2.7/site-packages/numpy/core/numeric.py - found
===> py27-opencv-2.3.1_3 depends on file: /usr/local/bin/python2.7 - found
===> py27-opencv-2.3.1_3 depends on executable: pkg-config - found
===> py27-opencv-2.3.1_3 depends on file: /usr/local/bin/cmake - found
===> py27-opencv-2.3.1_3 depends on shared library: opencv_legacy.2 - found
===> Configuring for py27-opencv-2.3.1_3
[...]
-- Looking for pthread.h - found
-- Found PythonInterp: /usr/local/bin/python (found version "2.7.3")
-- Found PythonLibs: /usr/local/lib/libpython3.1.so (found version "3.1.5")
-- Use NumPy headers from: /usr/local/lib/python2.7/site-packages/numpy/core/include
-- Found Sphinx 1.1.2: /usr/local/bin/sphinx-build
-- Parsing 'cvconfig.h.cmake'
>Fix:
I'm not entirely sure, if that should be fixed in the related
cmake files
/usr/local/share/cmake/Modules/FindPythonInterp.cmake
/usr/local/share/cmake/Modules/FindPythonLibs.cmake
by adjusting the search/find order or go into the relevant Mk
files. Below is a patch for bsd.python.mk, which explicitly sets
the Python version to be used in bsd.python.mk, based on the
detected PYTHON_VER.
Index: Mk/bsd.python.mk
===================================================================
RCS file: /home/pcvs/ports/Mk/bsd.python.mk,v
retrieving revision 1.143
diff -u -r1.143 bsd.python.mk
--- Mk/bsd.python.mk 11 Apr 2012 12:52:16 -0000 1.143
+++ Mk/bsd.python.mk 20 May 2012 08:31:02 -0000
@@ -674,6 +674,11 @@
.endif # defined(USE_TWISTED)
+.if defined(USE_CMAKE)
+CMAKE_ARGS+= -DPythonLibs_FIND_VERSION:STRING="${PYTHON_VER}" \
+ -DPythonInterp_FIND_VERSIN:STRING="${PYTHON_VER}"
+.endif
+
# XXX Hm, should I export some of the variables above to *_ENV?
.endif # !defined(_POSTMKINCLUDED) &&
!defined(Python_Pre_Include)