Set size_t to usize in build configuration

[luodeb]

--- stderr
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c: In function ‘fflush’:
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c:73:18: warning: unused parameter ‘f’ [-Wunused-parameter]
     73 | int fflush(FILE *f)
        |            ~~~~~~^
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c: In function ‘qsort’:
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c:159:42: warning: cast between incompatible function types from ‘__compar_fn_t’ {aka ‘int (*)(const void *, const void *)’} to ‘int (*)(const void *, const void *, void *)’ [-Wcast-function-type]
    159 |         return qsort_r(base, nel, width, (__compar_d_fn_t)comp, NULL);
        |                                          ^
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c:159:16: warning: ISO C forbids ‘return’ with expression, in function returning void [-Wpedantic]
    159 |         return qsort_r(base, nel, width, (__compar_d_fn_t)comp, NULL);
        |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  /home/debin/.cargo/git/checkouts/lwext4_rust-54dccac8b9756226/033fa2c/c/lwext4/src/ulibc.c:154:6: note: declared here
    154 | void qsort(void *base,
        |      ^~~~~

  thread 'main' panicked at /home/debin/.cargo/registry/src/rsproxy.cn-e3de039b2554c837/bindgen-0.72.1/codegen/mod.rs:939:25:
  assertion `left == right` failed: Target platform requires `--no-size_t-is-usize`. The size of `ssize_t` (4) does not match the target pointer size (8)
    left: 4
   right: 8
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
make[2]: *** [scripts/make/build.mk:53: _cargo_build] Error 101
make[2]: Leaving directory '/home/debin/Codes/starry/starrys/StarryOS-Realtek/arceos'
make[1]: *** [Makefile:39: build] Error 2
make[1]: Leaving directory '/home/debin/Codes/starry/starrys/StarryOS-Realtek'
make: *** [Makefile:52: opi5p] Error 2

[Copilot]

Pull Request Overview

This PR fixes a bindgen compilation failure encountered during cross-compilation for 64-bit targets. The error occurred because bindgen detected that ssize_t was 4 bytes while the target platform had 8-byte pointers, causing an assertion failure.

• Adds .size_t_is_usize(false) to the bindgen builder configuration to handle cross-compilation scenarios where C's size_t doesn't match Rust's target pointer size

---

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[AsakuraMizu]

Which platform are you using to build this? We haven't encountered this problem before.