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How can I set the Arduido IDE to generate the -S flag to gcc to see the machine code in Arduino? (the sketches)

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    avr-gcc's switch "-S" means "Compile only; do not assemble or link". Are you thinking of avr-objdump? It's "-S" switch means "Intermix source code with disassembly".
    – JRobert
    Commented Jan 7, 2017 at 16:31

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Compiler flags are defined in the platform.txt of the board you have selected in the Tools > Board menu. You can also add compiler flags via a build.extra_flags property in the boards.txt entry for the selected board.

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