Building on MacOS Sequoia with Clang 17

[chiefenne]

NOTE: I posted mostly the same text in the MicroPython Issues as it is also relevant there.

I was trying to build LVGL MicroPython binding on MacOS Sequoia, Apple clang version 17.0.0 (clang-1700.3.19.1), Target: x86_64-apple-darwin24.6.0 and I got compilation errors with respect to MP_STATIC_ASSERT in misc.h.

With the help of ChatGPT I could fix misc.h and sucessfull build:
LVGL (9.3.0) MicroPython (1.25.0) Binding compiled on 2025-10-19; Generic ESP32 module with ESP32

The suggested change in lib/micropython/py/misc.h was:

/*
// Static assertion macro
define MP_STATIC_ASSERT(cond) ((void)sizeof(char[1 - 2 * !(cond)]))
*/

// -----------------------------------------------------------------------------
// Static assertion macros (portable across GCC, Clang, MSVC)
// -----------------------------------------------------------------------------

// Use C11 _Static_assert when available (Clang/GCC both support it)
#if defined(__clang__) || defined(__GNUC__) || \
    (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L)
    #define MP_STATIC_ASSERT(cond) _Static_assert(cond, "MP_STATIC_ASSERT failed")
#else
    // Fallback for pre-C11 compilers
    #define MP_STATIC_ASSERT(cond) \
        typedef char mp_static_assert_##__LINE__[(cond) ? 1 : -1]
#endif

// -----------------------------------------------------------------------------
// Some macros (like mp_obj_is_type) place these inside expressions.
// _Static_assert cannot appear there, so make this a no-op in such contexts.
// -----------------------------------------------------------------------------
#if !defined(MP_STATIC_ASSERT_NONCONSTEXPR)
    #define MP_STATIC_ASSERT_NONCONSTEXPR(cond) ((void)0)
#endif

That did the trick. Maybe that helps someone as an intermediate solution. It seems that this will be addressed in MicroPython.