如何向 PlatformIO 项目添加额外包含目录

在 platformio.ini 中，添加以下构建标志：

platformio_build_flags.ini

build_flags = -I../my-extra-include-dir

build_flags = -I../my-extra-include-dir

使用此方法，你还可以添加多个包含目录：

platformio_build_flags_multiple.ini

build_flags = -I../my-first-include-dir -I../my-second-include-dir

build_flags = -I../my-first-include-dir -I../my-second-include-dir

所有路径都相对于 platformio.ini 所在的目录。

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