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Date: Thu, 14 Feb 2019 18:27:26 -0800
From: Nick Bray <>
Subject: Re: [PATCH] eliminate strict parentheses warnings for byteswaps

To give a little more context, I am targeting a small non-Linux OS.
We are not at a point where maintaining our own toolchain make sense.
Instead we are using Android's prebuilt toolchains, providing an
alternate sysroot (empty for now), and treating Musl as a library
built from source.  It's a flat playing field and there is no such
thing as system headers or system libraries.  We can dial the
strictness down when compiling Musl itself, but header files touch
everything.  This isn't the traditional use case, but Musl seems like
a pretty good choice for embedded systems-ish type work when you need
to scale down into a smaller memory footprint.

On Thu, Feb 14, 2019 at 5:55 PM A. Wilcox <> wrote:
> On 02/14/19 18:24, Nick Bray wrote:
> > Patch is attached.
> >
> > The change was motivated by including Musl's headers from a project
> > with -Werror -Wall enabled. I believe Fucshia ran into this, too.  I
> > couldn't think of a good regression test, in part because warnings are
> > somewhat compiler specific.  One possible approach would be to enable
> > -Werror -Wall in the main build, but that runs into issues of which
> > compilers are supported and what the core developers prefer.  Another
> > approach would be to only lint the header files - generate a dummy .c
> > file that includes all the header files and compile it with -Werror.
> > This is complicated by the "redirection" header files that warn you
> > should use the canonical version.  Which header files should be
> > checked?  So for the moment I punted on regression testing.  I mention
> > this line of thinking in case anyone has some perspective.
> This has a strong +1 from me, but changes like this have already been
> rejected at least twice on this list because "compilers shouldn't warn
> about system headers".
> Perhaps at attempt #3, they will just accept that this happens regularly
> enough that a few parens is not the end of the world.  (It also makes
> more components of musl reusable in other libraries, if desired.)
> Best,
> --arw
> --
> A. Wilcox (awilfox)
> Project Lead, Adélie Linux

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