Modules/audioop.c is giving compile warnings on Windows against lines 18 & 437.

..\Modules\audioop.c(18): warning C4146: unary minus operator applied to unsigned type, result still unsigned
..\Modules\audioop.c(437): warning C4146: unary minus operator applied to unsigned type, result still unsigned

The attached patch appears to fix the problem.

But it adds warnings on 32-bit platform with GCC.

/home/serhiy/py/cpython/Modules/audioop.c:18:61: warning: integer overflow in expression [-Woverflow]
/home/serhiy/py/cpython/Modules/audioop.c: In function ‘audioop_minmax’:
/home/serhiy/py/cpython/Modules/audioop.c:437:33: warning: integer overflow in expression [-Woverflow]

What if use (int)-0x80000000 instead of -(int)0x80000000? Does it silence warnings on Windows?

I don't think it will, given MS description of the compiler warning:

http://msdn.microsoft.com/en-us/library/4kh09110%28v=vs.100%29.aspx

but I'll certainly give it a go.

Use

-0x7FFFFFFF-1

Nobody should complain about that, because it's standard C ;-)

On Sun, Oct 27, 2013 at 3:20 PM, Tim Golden <report@bugs.python.org> wrote:
>
> Tim Golden added the comment:
>
> I don't think it will, given MS description of the compiler warning:
>
> http://msdn.microsoft.com/en-us/library/4kh09110%28v=vs.100%29.aspx
>
> but I'll certainly give it a go.
>
> ----------
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> <http://bugs.python.org/issue19418>
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LGTM. Do you want commit a patch?

@Serhiy, nope, pressed for time today :-(

Good idea. I'll test against Win32/64 & Linux 32

The attached patch (using Tim Peters' -1 trick) builds & tests ok on Win32/64 & Linux 32.

You should add a comment to explain why the trick is required (because of compilers not supporting -0x80000000 literal without a warning).

Good point. Updated patch.

LGTM.

New changeset 0848c90a5dd1 by Tim Golden in branch 'default':
Issue #19418 Fix some warnings on Win64
http://hg.python.org/cpython/rev/0848c90a5dd1

New changeset 54bf7b5ec3b6 by Tim Golden in branch '3.3':
Issue #19418 Fix some warnings on Win64
http://hg.python.org/cpython/rev/54bf7b5ec3b6

Fixed in 3.3 / 3.4

New changeset e5b79c546370521764457ea2ec809303e580f5ea by Victor Stinner in branch '2.7':
bpo-19418: audioop.c: Fix warnings on -0x80000000 (GH-7453)
https://github.com/python/cpython/commit/e5b79c546370521764457ea2ec809303e580f5ea