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Home/ Questions/Q 6974317
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Editorial Team
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Editorial Team
Asked: May 27, 20262026-05-27T17:13:17+00:00 2026-05-27T17:13:17+00:00

Anyone has any ideas which will take preference if -O2 and -O0 is specified

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Anyone has any ideas which will take preference if -O2 and -O0 is specified in the command line for gcc? I have some legacy code that gets configuration from multiple places….

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  1. Editorial Team
    Editorial Team
    2026-05-27T17:13:18+00:00Added an answer on May 27, 2026 at 5:13 pm
    λ > g++ outer.cxx -O2 -Os -o outer
    λ > sha1sum outer                 
    c3f62ab60393266388a8a7fb2d204d4b1f9dc145  outer
    λ > g++ outer.cxx -Os -O2 -o outer
    λ > sha1sum outer
    355052e82d0146a185c8a1b845c7ed6db18087f1  outer
    λ > g++ outer.cxx -O2 -o outer
    λ > sha1sum outer
    355052e82d0146a185c8a1b845c7ed6db18087f1  outer
    λ > g++ outer.cxx -Os -o outer
    λ > sha1sum outer
    c3f62ab60393266388a8a7fb2d204d4b1f9dc145  outer
    

    The last specified optimization flag wins.

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