Tim Serong 3bde34af8a cmake: remove cython 0.29's subinterpreter check ... cython 0.29 introduced a check which prevents multiple python subinterpreters from loading the same module: https://github.com/cython/cython/commit/7e27c7c Unfortunately, this completely breaks ceph-mgr. Until we can figure out a better long term solution, this commit removes cython's subinterpreter check, via some careful abuse of the C preprocessor. This works because when cython is invoked, it first generates some C code, then compiles it. We know it's going to generate C code including: int __Pyx_check_single_interpreter(void) { ... } and: if (__Pyx_check_single_interpreter()) return NULL; So, we can do the following: #define void0 dead_function(void) #define __Pyx_check_single_interpreter(ARG)=ARG ## 0 This replaces the call to __Pyx_check_single_interpreter() with a literal 0, removing the subinterpreter check. The void0 dead_function(void) thing is necessary because the __Pyx_check_single_interpreter() macro also clobbers that function definition, so we need to make sure it's replaced with something that works as a function definition. Fixes: https://tracker.ceph.com/issues/37472 Signed-off-by: Tim Serong <tserong@suse.com>		2018-12-17 23:27:06 +11:00
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modules	cmake: remove cython 0.29's subinterpreter check	2018-12-17 23:27:06 +11:00