cmake: use specified python3 version if any

use might have multiple python3 installed, some of them has/have all
dependencies installed and is good enough for building Ceph. we should
not always use the latest python installed in the system and complain that
there is missing dependencies, even if user has installed all the
python3 dependencies for the older python3.

put in other words, if user only installs cython module for python3.4, but
she has both python3.6 and python3.4 in her system. we should not force
her to uninstall python3.6 for installing Ceph.

this change also aligns with MGR_PYTHON_VERSION. i am not applying the
same change to WITH_PYTHON2, because python2 is already stablized. and distros
are not likely to release new python2 releases.

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit d8c13e86048b7aac458f3eda101f9778e3d45dcf)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 1b1f19d464e028d036efd8592f93595a35ae9271..ba96954e87f86fe76f9c4d31704e8e3cf82a834d 100644 (file)
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -223,10 +223,13 @@ if(WITH_PYTHON2)
   find_package(PythonLibs 2 REQUIRED)
 endif()
 
-option(WITH_PYTHON3 "build python3 bindings" OFF)
+set(WITH_PYTHON3 "OFF" CACHE STRING "build python3 bindings with specified python3 version")
 if(WITH_PYTHON3)
-  find_package(Python3Interp 3 REQUIRED)
-  find_package(Python3Libs 3 REQUIRED)
+  if(WITH_PYTHON3 MATCHES "^(1|ON|YES|TRUE|Y)$")
+    set(WITH_PYTHON3 "3")
+  endif()
+  find_package(Python3Interp ${WITH_PYTHON3} REQUIRED)
+  find_package(Python3Libs ${WITH_PYTHON3} REQUIRED)
 endif()
 
 # the major version of the python bindings as a dependency of other