[PATCH] PR18327: -Wsystem-headers introduces build errors

Richard Smith richard at metafoo.co.uk
Mon Jan 6 13:39:00 PST 2014

On Mon, Jan 6, 2014 at 1:11 PM, Alp Toker <alp at nuanti.com> wrote:

> Some further late-breaking thoughts below..
> On 06/01/2014 19:27, Richard Smith wrote:
>  So -Wsystem-headers would allow warnings (but not errors) to be produced
>> in system headers
> ^ This mode doesn't sound useful or in line with user expectations: Anyone
> requesting to see warnings in system headers almost certainly also wants to
> see errors in headers, even if demoted to warnings, but certainly not to
> have them silently ignored without any diagnostic message.

Perhaps I didn't explain clearly what I meant. None of my suggestions
proposed changing the behavior of warning flags outside system headers.
-Wsystem-headers would only affect warnings that are enabled outside system

>  , and -Werror=system-headers would also allow errors to be produced in
>> system headers.
> ^ If -Werror=system-headers were ever to be supported it should make all
> warnings in system headers turn into errors, not just enable errors that
> are usually invisible. I don't think either is a particularly useful mode
> as long as we have basic -Werror -Wsystem-headers working correctly (change
> proposed in my previous mail).
> Alp.
> --
> http://www.nuanti.com
> the browser experts
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