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-O2、-O3、-Ofast 优化时，编译器在执行路径中插入了 udf 255 指令，导致出现硬件故障（HF）。 1154 pQueryChunk->pSrcDriver = pParser->pSourceDriver; 080157f4: ldr.w r3, [r9, #20] 080157f8: str.w r3, [r11, #12] 080157fc: b.n 0x801556e <httpG4WebPage+1130> 080157fe: movs r3, #0 08015800: ldr.w r2, [r9, #20] 08015804: str r2, [r3, #12] 08015806: udf #255 ; 0xff <---------- obviously wrong if (pQueryChunk && ioIsValid(pRawChunk)) { pQueryChunk->pSrcDriver = pRawChunk->pSrcDriver; } else if (pParser) { pQueryChunk->pSrcDriver = pParser->pSourceDriver; } GNU C11 (GNU Tools for STM32 10.3-2021.10.20211105-1100) version 10.3.1 20210824 (release) (arm-none-eabi) compiled by GNU C version 7.3-win32 20180312, GMP version 6.1.0, MPFR version 3.1.4, MPC version 1.0.3, isl version isl-0.18-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 COLLECT_GCC_OPTIONS='-mcpu=cortex-m4' '-std=gnu11' '-g3' '-D' '_GNU_SOURCE=1' '-D' 'USE_HAL_DRIVER' '-D' '_DEBUG=1' '-D' 'DEBUG_RUN_WITHOUT_CHECKS=1' '-D' 'DEBUGFILEWRITE=0' '-D' 'DEBUG=0' '-D' 'SLOWSPIDEBUG=0' '-D' 'USE_FULL_ASSERT' '-D' '__USE_SIMPLE_SWO=0' '-D' 'USE_SWOTRACE=1' '-D' 'AMD64' '-D' 'HSE_VALUE=16000000UL' '-D' 'USE_FULL_LL_DRIVER=0' '-D' 'BOOTLOADER_VERSION=1' '-D' 'ALLOW_SOFTWARE_BKPTS=1' '-D' 'ARM_MATH_CM4' '-D' 'FORCE_CUBE_USB' '-D' 'USE_EMBEDDED_PHY=1' '-D' 'USE_USB_OTG_FS=1' '-D' 'BITMAP_LCD_ALLOWED=0' '-D' 'LCDGUI_ALLOWED=0' '-D' 'LCD_ALLOWED=0' '-D' 'GPS_ALLOWED=0' '-D' 'STM32L4S9xx' '-D' 'STM32L' '-D' 'INCLUDE_SLEEP_FUNCTIONS=1' '-D' 'COMPILE_FOR_EWB=1' '-D' 'COMPILE_USE_PL4S=1' '-c' '-Ofast' '-ffunction-sections' '-fdata-sections' '-Wall' '-v' '-fstack-usage' '-MMD' '-MP' '-MF' '-MT' '-specs=nano.specs' '-mfpu=fpv4-sp-d16' '-mfloat-abi=hard' '-mthumb' '-o' '-mlibarch=armv7e-m+fp' '-march=armv7e-m+fp' -march=armv7e-m -mfloat-abi=hard -mfpu=fpv4-sp-d16 -meabi=5 -o Libraries/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr.o C:\Users\Piotr\AppData\Local\Temp\ccHP5ygN.s GNU assembler version 2.36.1 (arm-none-eabi) using BFD version (GNU Tools for STM32 10.3-2021.10.20211105-1100) 2.36.1.20210621 示例：这是一个相当大的项目（约 800 个源文件），生成了 800k 的代码。这使得集成开发环境（IDE）无法使用。只有 -O0 和 -Og 选项能够避免插入 udf 指令。
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