btf__add_float
LIBBPF_API int btf__add_float(struct btf *btf, const char *name, size_t byte_sz);
ASSERT_GT(btf__add_float(btf, "test_float", 4), 0, "add float");
ASSERT_GT(btf__add_float(btf, "test_double", 8), 0, "add_double");
ASSERT_GT(btf__add_float(btf, "test_long_double", 16), 0, "add long double");
btf__add_float(btf, "float", 4); /* [17] float; */