Compiling eval.c with zig cc generates implicit conversion warning and affects chibi-scheme excutable's functionality

[congcongkuo]

Zig version: 0.14.0
OS: macOS 15.4

zig cc -c -Iinclude -o eval.o eval.c

eval.c:1861:19: warning: implicit conversion from 'sexp_sint_t' (aka 'long') to 'long double' changes value from 4611686018427387903 to 4611686018427387904 [-Wimplicit-const-int-float-conversion]
 1861 |   if ((f*1000.0 > SEXP_MAX_FIXNUM) || (f*1000.0 < SEXP_MIN_FIXNUM)
      |                 ~ ^~~~~~~~~~~~~~~
include/chibi/sexp.h:352:88: note: expanded from macro 'SEXP_MAX_FIXNUM'
  352 | #define SEXP_MAX_FIXNUM ((((sexp_sint_t)1)<<(sizeof(sexp_sint_t)*8-SEXP_FIXNUM_BITS-1))-1)
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
1 warning generated.

If I ignore this warning, I can build libchibi-scheme and chibi-scheme successfully. But when I run

chibi-scheme -V

I got

thread 13403759 panic: store of misaligned address 0x140055331 for type 'sexp_uint_t' (aka 'unsigned long'), which requires 8 byte alignment
chibi/vm.c:166:72: 0x1051cf347 in sexp_emit_word (chibi/vm.c)
  *((sexp_uint_t*)(&(data[sexp_unbox_fixnum(sexp_context_pos(ctx))]))) = val;
                                                                       ^
chibi/vm.c:273:5: 0x1051d1bef in generate_non_global_ref (chibi/vm.c)
    sexp_emit_word(ctx, sexp_param_index(ctx, lambda, name));
    ^
chibi/vm.c:306:7: 0x1050ea357 in generate_ref (chibi/vm.c)
      generate_non_global_ref(ctx, sexp_ref_name(ref), sexp_ref_cell(ref),
      ^
chibi/vm.c:769:23: 0x1050e3b0b in sexp_generate (chibi/vm.c)
    case SEXP_REF:    generate_ref(ctx, x, 1); break;
                      ^
chibi/vm.c:394:9: 0x1051c9c37 in generate_opcode_app (chibi/vm.c)
        sexp_generate(ctx, 0, 0, 0, sexp_car(ls));
        ^
chibi/vm.c:563:5: 0x1050e41ef in generate_app (chibi/vm.c)
    generate_opcode_app(ctx, app);
    ^
chibi/vm.c:766:23: 0x1050e3abf in sexp_generate (chibi/vm.c)
    case SEXP_PAIR:   generate_app(ctx, name, loc, lam, x); break;
                      ^
chibi/vm.c:394:9: 0x1051c9c37 in generate_opcode_app (chibi/vm.c)
        sexp_generate(ctx, 0, 0, 0, sexp_car(ls));
        ^
chibi/vm.c:563:5: 0x1050e41ef in generate_app (chibi/vm.c)
    generate_opcode_app(ctx, app);
    ^
chibi/vm.c:766:23: 0x1050e3abf in sexp_generate (chibi/vm.c)
    case SEXP_PAIR:   generate_app(ctx, name, loc, lam, x); break;
                      ^
chibi/vm.c:716:3: 0x1050e70a7 in generate_lambda (chibi/vm.c)
  sexp_generate(ctx2, name, loc, lam, sexp_lambda_body(lambda));
  ^
chibi/vm.c:767:23: 0x1050e3adb in sexp_generate (chibi/vm.c)
    case SEXP_LAMBDA: generate_lambda(ctx, name, loc, lam, x); break;
                      ^
chibi/vm.c:319:5: 0x1050eb213 in generate_set (chibi/vm.c)
    sexp_generate(ctx, sexp_ref_name(ref), sexp_ref_loc(ref), sexp_set_value(set), sexp_set_value(set));
    ^
chibi/vm.c:770:23: 0x1050e3b1b in sexp_generate (chibi/vm.c)
    case SEXP_SET:    generate_set(ctx, x); break;
                      ^
chibi/eval.c:2694:3: 0x105241197 in sexp_generate_op (chibi/eval.c)
  sexp_generate(ctx2, 0, 0, 0, ast);
  ^
chibi/eval.c:2728:15: 0x105243027 in sexp_compile_op (chibi/eval.c)
        res = sexp_generate_op(ctx2, self, n, ast, ctx2);
              ^
chibi/eval.c:2751:40: 0x105212e7f in sexp_eval_op (chibi/eval.c)
  res = sexp_exceptionp(ctx2) ? ctx2 : sexp_compile_op(ctx2, self, n, obj, env);
                                       ^
chibi/eval.c:1545:38: 0x1052115cb in sexp_load_op (chibi/eval.c)
      res = sexp_exceptionp(x) ? x : sexp_eval(ctx2, x, env);
                                     ^
chibi/eval.c:2401:11: 0x105233107 in sexp_load_module_file (chibi/eval.c)
    res = sexp_load(ctx, path, env);
          ^
chibi/eval.c:2552:9: 0x10523a1bf in sexp_load_standard_env (chibi/eval.c)
  tmp = sexp_load_module_file(ctx, init_file, e);
        ^
chibi/main.c:252:7: 0x10482a5d7 in sexp_load_standard_repl_env (chibi/main.c)
  e = sexp_load_standard_env(ctx, env, k);
      ^
chibi/main.c:481:7: 0x10481d8c7 in run_main (chibi/main.c)
      load_init(1);
      ^
chibi/main.c:684:9: 0x1048307cf in main (chibi/main.c)
  res = run_main(argc, argv);
        ^
???:?:?: 0x1939bc273 in ??? (???)
???:?:?: 0x0 in ??? (???)
fish: Job 1, 'chibi-scheme -V' terminated by signal SIGABRT (Abort)