On Tue, Nov 07, 2023 at 04:01:12PM +0000, Lucretia wrote:
> I read the whole file top to bottom, slowly and with care, and saw no
> comments about __dead. Unless by chance they've been added since
> 7.4 release.
Immediately above where __dead and __pure are defined is the following
comment:
/*
* GCC1 and some versions of GCC2 declare dead (non-returning) and
* pure (no side effects) functions using "volatile" and "const";
* unfortunately, these then cause warnings under "-ansi -pedantic".
* GCC >= 2.5 uses the __attribute__((attrs)) style. All of these
* work for GNU C++ (modulo a slight glitch in the C++ grammar in
* the distribution version of 2.5.5).
*/
This, with a few updates and changes, has been in the source code
for > 30 years.
For reference, the same comment in the same file in the NetBSD tree
is a bit more verbose and gives some examples of what pure and const
are used for.
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