How may I override the compiler (GCC) flags that setup.py uses by default?

by

  • Prepend CFLAGS="-O0" before you run setup.py:

    % CFLAGS="-O0" python ./setup.py

    The -O0 will be appended to CFLAGS while compiling, therefore will override previous -O2 setting.

  • Another way is add -O0 to extra_compile_args in setup.py:

    moduleA = Extension('moduleA', .....,
        include_dirs = ['/usr/include', '/usr/local/include'], 
        extra_compile_args = ["-O0"], 
        )

  • If you want to remove all default flags, use:

    % OPT="" python ./setup.py

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