Ceph » mgr

build as follows:

./do_cmake.sh -DWITH_TESTS=off
cd build
make -j

failed with the following message:

/tmp/ceph/src/mgr/PyModuleRegistry.cc: In member function ‘void PyModuleRegistry::init()’:
/tmp/ceph/src/mgr/PyModuleRegistry.cc:47:39: error: ‘PYTHON_EXECUTABLE’ was not declared in this scope
   Py_SetProgramName(const_cast<char*>(PYTHON_EXECUTABLE));
                                       ^~~~~~~~~~~~~~~~~
/tmp/ceph/src/mgr/PyModuleRegistry.cc:47:39: note: suggested alternative: ‘MAP_EXECUTABLE’
   Py_SetProgramName(const_cast<char*>(PYTHON_EXECUTABLE));
                                       ^~~~~~~~~~~~~~~~~
                                       MAP_EXECUTABLE

The reason is that cmake 'FindPython' module doesn't set PYTHON_EXECUTABLE variable but Python_EXECUTABLE(cmake var is case-sensitive)
When exeucuting cmake with option "-WITH-TESTS=on", 'PythonInterp' moudule is imported in googletest. 'PythonInterp' module set PYTHON_EXECUTABLE variable, so no compilation problem.
But with an option 'WITH-TESTS=off', PYTHON_EXECUTABLE var doesn't exists, so compilation failed.

https://github.com/ceph/ceph/pull/30199

Ilsoo Byun wrote:

The reason is that cmake 'FindPython' module doesn't set PYTHON_EXECUTABLE variable but Python_EXECUTABLE(cmake var is case-sensitive)
When exeucuting cmake with option "-WITH-TESTS=on", 'PythonInterp' moudule is imported in googletest. 'PythonInterp' module set PYTHON_EXECUTABLE variable, so no compilation problem.
But with an option 'WITH-TESTS=off', PYTHON_EXECUTABLE var doesn't exists, so compilation failed.

https://github.com/ceph/ceph/pull/30199

If PYTHONE_EXECUTABLE is not set, the following line is converted to "/* #undef PYTHON_EXECUTABLE */"

#cmakedefine PYTHON_EXECUTABLE "@MGR_PYTHON_EXECUTABLE@" (src/include/config-h.in.cmake:328)