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Date: Tue, 21 Apr 2015 02:56:27 +0300 (MSK)
From: Alexander Monakov <amonakov@...ras.ru>
To: musl@...ts.openwall.com
Subject: Re: x86_64 and x32 fail to build
> When building without --enable-warnings, there are many false positives from
> -Wpointer-to-int-cast about x32 __scc(); at least from 4.5 onwards GCC enables
> this warning by default, so perhaps if musl really wants to silence it, it
> should test the corresponding -Wno-... flag outside of x$warnings == xyes
> test?
Could it be possible that implementation of __scc() can be adjusted to avoid
triggering the warning? I hoped the following would achieve that:
// Cast X to signed integral type of corresponding size
#define __scc1(X) (__typeof__((X)-(__typeof__(1?(X):0))0)) (X)
#define __scc(X) sizeof(1?(X):0ULL) < 8 ? (unsigned long) __scc1(X) : (long long) __scc1(X)
... but unfortunately it doesn't work with -Werror=pointer-arith when type of
X is 'void *'.
Alexander
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