Issue #17108 has been reported by aotto1968 (Andreas Otto).

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Bug #17108: error: initialization of °∆long unsigned int°« from °∆void *°« makes integer from pointer without a cast
https://bugs.ruby-lang.org/issues/17108

* Author: aotto1968 (Andreas Otto)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-linux-gnu]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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Hi, it seems that the "OPTIMIZATION" macro for "rb_funcall" make something "bad"

||   CC       rubymsgque_la-misc_ruby.lo
|| .../misc_ruby.c: In function °∆rubymsgque_OtCheckCallable°«:
.../misc_ruby.c|430 col 18| error: initialization of °∆long unsigned int°« from °∆void *°« makes integer from pointer without a cast [-Werror=int-conversion]
||    MQ_INT arity = VAL2INT(rb_funcall(val,NS(id_arity),0,NULL));
||                   ^~~~~~~
.../misc_ruby.c|430 col 18| note: (near initialization for °∆rb_funcall_args[0]°«)                                                                                                             
|| cc1: all warnings being treated as errors

MQ_INT arity = VAL2INT(rb_funcall(val,NS(id_arity),0,NULL));

#define VAL2INT(val)        (MQ_INT)NUM2INT(val)

ID NS(id_arity);

#if defined(__GNUC__) && defined(HAVE_VA_ARGS_MACRO) && defined(__OPTIMIZE__)
# define rb_yield_values(argc, ...) \
__extension__({ \
        const int rb_yield_values_argc = (argc); \
        const VALUE rb_yield_values_args[] = {__VA_ARGS__}; \
        const int rb_yield_values_nargs = \
            (int)(sizeof(rb_yield_values_args) / sizeof(VALUE)); \
        rb_yield_values2( \
            rb_varargs_argc_check(rb_yield_values_argc, rb_yield_values_nargs), \
            rb_yield_values_nargs ? rb_yield_values_args : NULL); \
    })

# define rb_funcall(recv, mid, argc, ...) \
__extension__({ \
        const int rb_funcall_argc = (argc); \
        const VALUE rb_funcall_args[] = {__VA_ARGS__}; \
        const int rb_funcall_nargs = \
            (int)(sizeof(rb_funcall_args) / sizeof(VALUE)); \
        rb_funcallv(recv, mid, \
            rb_varargs_argc_check(rb_funcall_argc, rb_funcall_nargs), \
            rb_funcall_nargs ? rb_funcall_args : NULL); \
    })
#endif




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