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Configure on Windows in Qt 5.6 does not detect the target gcc version correctly and reports the host gcc version instead. That means we'll end up enabling -fno-lifetime-dse with a gcc version that doesn't support it and consequently fail to build. Since in the 5.6 branch we only support QNX 6 and we know that the gcc version is 4.7 and thus not affected by the DSE problem, we might as well unconditionally disable the workaround there. This change is only for 5.6 as 5.8/5.9 and newer detect the gcc version correctly _and_ don't need the -fno-lifetime-dse workaround anymore. Task-number: QTBUG-62820 Change-Id: I55baf532a9126eb2f8c5f11858d52cccad6c355b Reviewed-by: Sami Nurmenniemi <sami.nurmenniemi@qt.io> Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
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