This will be useful to add static assertion to some tests like #463 wants to do.
For example, in the case of the test for #463, the test would need something
like:
trailer = """
#include <assert.h>
#if defined(CBINDGEN_STYLE_TAG) && !defined(__cplusplus)
static_assert(sizeof(struct P) == 4, "unexpected size for P");
#else
static_assert(sizeof(P) == 4, "unexpected size for P");
#endif
"""
As more of these tests are added it may be worth just adding a helper header
like this to avoid some duplication:
#include <assert.h>
#if defined(CBINDGEN_STYLE_TAG) && !defined(__cplusplus)
#define CBINDGEN_STRUCT(name) struct name
#else
#define CBINDGEN_STRUCT(name) name
#endif
And so on, so the previous configuration would become just:
trailer = """
#include "testing-helpers.h" // Or whatever
static_assert(sizeof(CBINDGEN_STRUCT(P)) == 4, "unexpected size for P");
"""
That may or may not be overkill to do as part of #463.
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