Bug report

Bug description:

Building Python 3.13.0a6 configured with--with-readline=editline fails like this for me:

./Modules/readline.c:1305:21: error: incompatible function pointer types assigning to 'rl_hook_func_t *' (aka 'int (*)(void)') from 'int (const char *, int)' [-Wincompatible-function-pointer-types]    rl_startup_hook= on_startup_hook;^~~~~~~~~~~~~~~~./Modules/readline.c:1307:23: error: incompatible function pointer types assigning to 'rl_hook_func_t *' (aka 'int (*)(void)') from 'int (const char *, int)' [-Wincompatible-function-pointer-types]    rl_pre_input_hook= on_pre_input_hook;^~~~~~~~~~~~~~~~~~2 errors generated.

It looks like e7e1116 is the cause. No editline header defines_RL_FUNCTION_TYPEDEF, but recent versions (in this case 20230828) declare these functions as takingvoid whereas Apple's version declares them the other way. I suspect that older clang versions and gcc may let you off with a warning rather than erroring on this type mismatch.

CPython versions tested on:

3.13

Operating systems tested on:

macOS

Linked PRs

• gh-117845: Detect libedit hook function signature in configure #117870