Re: Compilation warnings in Lua 5.2.1 (size_t to unsigned int conversion)

[William Ahern <william@...>]

On Thu, Sep 27, 2012 at 05:02:06PM -0600, William Sumner wrote:
> On Sep 27, 2012, at 4:24 PM, William Ahern <william@25thandClement.com> wrote:
> > On Wed, Sep 26, 2012 at 03:17:41PM +0200, jean-luc@zenocloud.eu wrote:
> >> Hi,
> >> 
> >> I migrated from Lua 5.2.0 to Lua 5.2.1 this morning. It went really smoothly but with some compiler warnings, hence this message.
> >> 
> >> So, compiling Lua 5.2.1 on OS X (x86_64) with LLVM compiler 4.1 produces these 2 warnings:
> >> 
> >> - lstring.c:52:25: warning: implicit conversion loses integer precision: 'unsigned long' to 'unsigned int'
<snip>
> > Sorry for beating a dead horse, but I was actually trying to track down the
> > issue in the clang source code. However, I can't reproduce this warning with
> > clang 4.1. What flags are you using? I can't get it with -Wall -Wextra.
> 
> Try -Wconversion or, more specifically, -Wshorten-64-to-32.

Ah, thanks.

The Lua source explodes with warnings on -Wconversion. So it must've been
 -Wshorten-64-to-32, which isn't even close to being a default warning.

>From the original report it sounded like this was a default or common
diagnostic switch.