[C/C++ PATCH] Fix -Wshift-overflow with sign bit

[Toon Moene]

On 08/12/2015 05:39 PM, Marek Polacek wrote:

> This patch fixes a defect in -Wshift-overflow.  We should only warn
> about left-shifting 1 into the sign bit when -Wshift-overflow=2.  But
> this doesn't apply only for 1 << 31, but also for 2 << 30, etc.
> In C++14, never warn about this.

And then there's this:

https://gcc.gnu.org/ml/gcc-testresults/2015-08/msg01036.html

[ Yes, that's at run time, not compile time ... ]

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Toon Moene - e-mail: toon@moene.org - phone: +31 346 214290
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