nfs-ganesha fails to build with gcc 10:

...
CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:105: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_helpers.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:103: multiple definition of `posix_file_systems'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:103: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_helpers.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:101: multiple definition of `avl_dev'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:101: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_helpers.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:100: multiple definition of `avl_fsid'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:100: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_lru.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:105: multiple definition of `fs_lock'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:105: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_lru.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:103: multiple definition of `posix_file_systems'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:103: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_lru.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:101: multiple definition of `avl_dev'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:101: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_lru.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:100: multiple definition of `avl_fsid'; CMakeFiles/MainServices.dir/nfs_init.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/FSAL/fsal_commonlib.h:100: first defined here
/usr/bin/ld: ../FSAL/Stackable_FSALs/FSAL_MDCACHE/CMakeFiles/fsalmdcache.dir/mdcache_lru.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/nfs_init.h:53: multiple definition of `gsh_dbus_thrid'; CMakeFiles/MainServices.dir/nfs_worker_thread.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/nfs_init.h:53: first defined here
/usr/bin/ld: ../dbus/CMakeFiles/gshdbus.dir/dbus_server.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/nfs_init.h:53: multiple definition of `gsh_dbus_thrid'; CMakeFiles/MainServices.dir/nfs_worker_thread.c.o:/builddir/build/BUILD/nfs-ganesha-3.2/src/include/nfs_init.h:53: first defined here
collect2: error: ld returned 1 exit status



This blocks the Python 3.9 rebuild.

This is fixed upstream and opened here to track it.

See https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/M2RZLG6YEQIFQOFVC2AP5ZKAEDV5PL54/