[Distutils] Optimization of C++ extensions to Python

[Andreas Klöckner]

Hi Michael,

On Montag 30 Juni 2008, Michael Wieher wrote:
> Can anyone
> a) tell me if my binary compiled w/extra_compile_args -O0 is, indeed, level
> zero b) tell me the correct way to adjust this flag?

Not sure about "correct", but this works for me:

8< ---------------------------------------------------------
def hack_distutils(debug=False, fast_link=True):
    # hack distutils.sysconfig to eliminate debug flags
    # stolen from mpi4py

    def remove_prefixes(optlist, bad_prefixes):
        for bad_prefix in bad_prefixes:
            for i, flag in enumerate(optlist):
                if flag.startswith(bad_prefix):
                    optlist.pop(i)
                    break
        return optlist

    import sys
    if not sys.platform.lower().startswith("win"):
        from distutils import sysconfig

        cvars = sysconfig.get_config_vars()
        cflags = cvars.get('OPT')
        if cflags:
            cflags = remove_prefixes(cflags.split(),
                    ['-g', '-O', '-Wstrict-prototypes', '-DNDEBUG'])
            if debug:
                cflags.append("-g")
            else:
                cflags.append("-O3")
                cflags.append("-DNDEBUG")
            cvars['OPT'] = str.join(' ', cflags)
            cvars["CFLAGS"] = cvars["BASECFLAGS"] + " " + cvars["OPT"]

        if fast_link:
            for varname in ["LDSHARED", "BLDSHARED"]:
                ldsharedflags = cvars.get(varname)
                if ldsharedflags:
                    ldsharedflags = remove_prefixes(ldsharedflags.split(),
                            ['-Wl,-O'])
                    cvars[varname] = str.join(' ', ldsharedflags)
8< ---------------------------------------------------------

Distutils may just be the most-monkeypatched piece of software in history.

Andreas
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