如何向 PlatformIO 项目添加编译器标志

要向 PlatformIO 项目添加编译器标志，在 platformio.ini 的构建配置中添加以下行：

platformio_build_flags.cpp

build_flags = -std=gnu++17

build_flags = -std=gnu++17

你也可以使用多行：

platformio_build_flags_multi.cpp

build_flags =
    -std=gnu++17
    -ffast-math

build_flags =
    -std=gnu++17
    -ffast-math

platformio.ini

[env:d1_mini]
platform = espressif8266
board = d1_mini
framework = arduino
monitor_speed = 115200
build_flags = -std=gnu++17

[env:d1_mini]
platform = espressif8266
board = d1_mini
framework = arduino
monitor_speed = 115200
build_flags = -std=gnu++17

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