掌機 - Miyoo Mini - 解決No conversion from source format to float available問題

問題(-O3)：

You must call Mix_SetMusicCMD() first
No conversion from source format to float available
setpriority() failed
music parameter was NULL

問題(-ggdb)：

You must call Mix_SetMusicCMD() first
setpriority() failed
WARN:

Assertion failure at SDL_ChooseAudioConverters (/home/steward/Data/mmiyoo/sdl2/src/audio/SDL_audiotypecvt.c:1426), triggered 1 time:
  'converters_chosen == SDL_TRUE'

That operation is not supported
No message system available
Abort/Break/Retry/Ignore/AlwaysIgnore? [abriA] :
Abort/Break/Retry/Ignore/AlwaysIgnore? [abriA] : a
free(): invalid pointer
Aborted

$ vim src/audio/SDL_audiotypecvt.c +1426

void SDL_ChooseAudioConverters(void)
{
    static SDL_bool converters_chosen = SDL_FALSE;

    if (converters_chosen) {
        return;
    }

#define SET_CONVERTER_FUNCS(fntype) \
    SDL_Convert_S8_to_F32 = SDL_Convert_S8_to_F32_##fntype; \
    SDL_Convert_U8_to_F32 = SDL_Convert_U8_to_F32_##fntype; \
    SDL_Convert_S16_to_F32 = SDL_Convert_S16_to_F32_##fntype; \
    SDL_Convert_U16_to_F32 = SDL_Convert_U16_to_F32_##fntype; \
    SDL_Convert_S32_to_F32 = SDL_Convert_S32_to_F32_##fntype; \
    SDL_Convert_F32_to_S8 = SDL_Convert_F32_to_S8_##fntype; \
    SDL_Convert_F32_to_U8 = SDL_Convert_F32_to_U8_##fntype; \
    SDL_Convert_F32_to_S16 = SDL_Convert_F32_to_S16_##fntype; \
    SDL_Convert_F32_to_U16 = SDL_Convert_F32_to_U16_##fntype; \
    SDL_Convert_F32_to_S32 = SDL_Convert_F32_to_S32_##fntype; \
    converters_chosen = SDL_TRUE

#if HAVE_SSE2_INTRINSICS
    if (SDL_HasSSE2()) {
        SET_CONVERTER_FUNCS(SSE2);
        return;
    }
#endif

#if HAVE_NEON_INTRINSICS
    if (SDL_HasNEON()) {
        SET_CONVERTER_FUNCS(NEON);
        return;
    }
#endif

#if NEED_SCALAR_CONVERTER_FALLBACKS
    SET_CONVERTER_FUNCS(Scalar);
#endif

#undef SET_CONVERTER_FUNCS

    SDL_assert(converters_chosen == SDL_TRUE);
}

發生錯誤的位置是上面的42行，原因是HAVE_XXX_INTRINSICS並沒有被定義，而像SSE2或者NEON則是被定義在include/SDL_cpuinfo.h，因此，必須開啟--enable-cpuinfo選項才可以讓Audio正常運作

解法如下：

--enable-cpuinfo