Disable warn about left shifts of negative values
It seems like there's no good reason for the compiler to exploit the undefinedness of left shifts. GCC explicitly documents that they do not use at all this possibility and, while they also say this is subject to change, they have been saying this for 10 years (since the wording appeared in the GCC 4.0 manual). Disable these warnings by passing in -Wno-shift-negative-value. Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Markus Armbruster <armbru@redhat.com> Cc: Laszlo Ersek <lersek@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> [pranith: forward-port part of patch to 2.7] Signed-off-by: NPranith Kumar <bobby.prani@gmail.com>
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