I get warnings when compiling with the patch:
/home/avassalotti/pickle4/Modules/_pickle.c: In function ‘save_global_binary’:
/home/avassalotti/pickle4/Modules/_pickle.c:2952: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:2956: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:2960: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:2975: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:2979: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:2988: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c:3012: warning: pointer targets in passing argument 2 of ‘_Pickler_Write’ differ in signedness
/home/avassalotti/pickle4/Modules/_pickle.c:872: note: expected ‘const char *’ but argument is of type ‘unsigned char *’
/home/avassalotti/pickle4/Modules/_pickle.c: In function ‘save_set’:
/home/avassalotti/pickle4/Modules/_pickle.c:3368: warning: suggest parentheses around assignment used as truth value
/home/avassalotti/pickle4/Modules/_pickle.c: In function ‘save_frozenset’:
/home/avassalotti/pickle4/Modules/_pickle.c:3422: warning: suggest parentheses around assignment used as truth value
These should be fixed.