[issue20374] Failure to compile with readline-6.3-rc1

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I'm surprised that warnings are emitted at lines 939 and 941, but not 944.

I think that instead type casting, the more robust way is to change hook functions signatures for on_startup_hook and on_pre_input_hook.

static int
#ifdef _RL_FUNCTION_TYPEDEF /* or may be test libedit macro? */
on_startup_hook(void)
#else
on_startup_hook()
#endif

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<http://bugs.python.org/issue20374>
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