Cross compiler CFLAGS thought

What’s the difference between mtune and mcpu. I’ve seen some that say to use mtune and I’ve been using mcpu.

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2 Responses to Cross compiler CFLAGS thought

  1. W says:

    -mcpu is the old way to specify both architecture and optimization target.
    Nowadays, you say -march=i686 to use i686 instructions, and -mtune=core2 to optimize the code for a Intel core 2. Use mtune for optimization, and mcpu to define the oldest architecture that can run your executable.

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