如何修复 GCC 错误：unknown type name 'size_t' (STM32)

问题：

尝试编译 C/C++ 项目（通常是 STM32 项目）时：

compile_error_output.txt

C:/Users/User/MyProject/MyHeader.h:9:7: error: unknown type name 'size_t'
        9 | const size_t MySize = 15;
            |       ^~~~~~

C:/Users/User/MyProject/MyHeader.h:9:7: error: unknown type name 'size_t'
        9 | const size_t MySize = 15;
            |       ^~~~~~

在错误发生的文件顶部，添加以下行：

include_stddef.h

#include <stddef.h>

#include <stddef.h>

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