In the last episode (Jul 29), Ruslan Ermilov said:
> Hm, I always thought that -O2 and -Os are just useful aliases that in
> effect only turn a few dozens of -f optimization flags, and that
> switching some of them off later is allowed. I.e., "-Os
> -fno-strict-aliasing" should work.
That does work, but there are still things you can't turn off with -f.
They're half-aliases. toplev.c::parse_options_and_default_flags does
set -f flags based on the optimization level, but there is still a
whole lot of gcc code that directly tests the value of optimize and
optimize_size.
--
Dan Nelson
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