Fix GCC ABI warning about flexible array member

[KFilipek]

There are 2 ways of mitigating ABI warning. The first one is to avoid copying structures with a flexible array member by using pointers. The second is to change structures declarations, e.g.:

struct span_timestamped_base {
    struct span_base span_base;
    uint64_t timestamp;
};

struct span_entry {
    struct span_timestamped_base span_base;
    uint64_t data[];
};

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This change is 

[karczex]

src/span.c line 63 at r1 (raw file):

Previously, lukaszstolarczuk (Łukasz Stolarczuk) wrote…

:+1:

👍