Lua define ARRAY_FLEXIBLE_MEMBER

[Ranier Vilela <ranier.vf@...>]

Lua could benefit from introducing ARRAY_FLEXIBLE_MEMBER define.

With C99 or greater, struct with array flexible member can be:

struct STRING_S

{

    size_t size;

    char data[];

};

Before C99, I think maybe it needs to be used with zero,

I haven't checked.

struct STRING_S

{

    size_t size;

    char data[0];

};

x86_64 plattform -O2

https://godbolt.org/z/PKP4hhMbe

#include <stdio.h>

struct STRING_S

{

    size_t size;

    char data[1];

};

typedef struct STRING_S string_t;

int main(void)

{

    string_t str;

    printf("size=%zu\n", sizeof(str));

    return 0;

}

ASM generation compiler returned: 0

Execution build compiler returned: 0
Program returned: 0
size=16

So, some structs can be reduced by 8 bytes.

struct Udata
struct CClosure
struct LClosure