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  • Are you asking this in terms of "the fraction of compile time taken by the preprocessor"? May I ask why you need to know? Commented Jul 16, 2013 at 15:07
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    time gcc -E source.c it's roughly enough to give you an idea. Commented Jul 16, 2013 at 15:08
  • @Floris I think i mean just the first 4 steps in translation phase. I want to know how to use structures effictively. Commented Jul 16, 2013 at 15:35
  • @user2485710 Thanks, that worked. But the values are somehow volatile - differences up to 100% for sys. The time function seems to apply to some other processes, which I can't really specify so far. Commented Jul 16, 2013 at 15:42
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    "I want to know how to use structures effictively". Not by measuring preprocessing times, that's for sure. Commented Jul 6, 2016 at 21:15