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Message-ID: <20180501141921.GW4418@port70.net>
Date: Tue, 1 May 2018 16:19:21 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Some questions
* Patrick Oppenlander <patrick.oppenlander@...il.com> [2018-05-01 10:10:45 +1000]:
> On Mon, Apr 30, 2018 at 1:16 PM, Rich Felker <dalias@...c.org> wrote:
> > On Mon, Apr 30, 2018 at 12:52:06PM +1000, Patrick Oppenlander wrote:
> >> - sigisemptyset uses bss. Could be implemented in a similar fashion to
> >> sigemptyset, save bss & would probably be faster.
> >
> > Ahh, yes. I wonder if gcc has any way to force const zero objects into
> > rodata rather than bss..? In any case memcmp is not an efficient way
> > to implement this, so maybe it should be changed.
>
> Doing this:
> - static const unsigned long zeroset[_NSIG/8/sizeof(long)];
> + static const unsigned long zeroset[_NSIG/8/sizeof(long)] = {};
>
> Makes it go into rodata.
{} is invalid initializer in c, use {0}.
it was a bug in gcc that it treated
static const int x;
and
static const int x = {0};
differently, they are completely equivalent in c,
it seems to me that gcc-trunk fixed it and clang
was never broken.
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