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Re: Deprecating arithmetic on std::atomic<void*>

On 20/04/17 12:20 +0100, Jonathan Wakely wrote:
On 20/04/17 11:12 +0100, Jonathan Wakely wrote:
On 20/04/17 12:07 +0200, Jakub Jelinek wrote:
On Thu, Apr 20, 2017 at 11:03:38AM +0100, Jonathan Wakely wrote:
Yet another case where warning suppression in system headers hurts the
library's ability to give diagnostics. We can't warn about using
incomplete types in std::unique_ptr because the -Wdelete-incomplete
warning gets suppressed, and the interaction of #pragma GCC diagnostic
with -Wsystem-headers is ... interesting. We need a way to enable
warnings for specific blocks of code, to say "do not suppress warnings
here, even though it's in a system header".

Can #pragma GCC warning "-Wno-system-headers" do that?

I don't think so. It didn't work last time I tried to use that to fix

I don't remember the details, but I think there was some weirdness
like the "pop" didn't restore the old value, or some other class of
warning disappeaed.

I might be misremembering. I thought I'd found a problem with that
approach, but I can't find any evidence of what the problem was.

I was right, push/pop doesn't work for -Wsystem-headers:

My attempted fix for 58876 causes a cascade of other warnings because
-Wsystem-headers remains active (and PR 79078 makes auto_ptr warn
about itself!)

I opened

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