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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/92546] [10/11 Regression] Large increase in
 preprocessed file sizes in C++2a mode
Date: Fri, 20 Nov 2020 19:29:27 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92546

--- Comment #15 from Jonathan Wakely <redi at gcc dot gnu.org> ---
<algorithm> and <memory> got unavoidably bigger in C++20 due to the extra a=
lgos
in std::ranges.

<valarray> includes <algorithm> so is larger. We can almost certainly repla=
ce
<algorithm> with <bits/stl_algobase.h> and <bits/stl_algo.h> for <valarray>=
's
purposes, it doesn't use the ranges algos.

<chrono> got a little bigger for C++20, and will grow bigger when the timez=
one
features are added. We should add <bits/chrono.h> with just duration,
time_point, steady_clock and system_clock, for use in <thread>, <mutex> etc.

<iterator> has all the concepts stuff, and that makes a lot of other headers
bigger. We might want to move common_iterator and counted_iterator out of
<bits/stl_iterator.h> so they're only included by <iterator> and not the bi=
ts
that <vector> etc. use.=