The warning was disabled in8794164fedto avoid false positives. But it is useful in finding errors, even if it sometimes results in untrue warnings (c.f.77fac974fe,da46a1bc3c). After #19168, #19169, and #19175, there are no warnings with -Dbuildtype=debug-optimized/-O2 and gcc-11.0.1-0.3.fc34.x86_64. Warnings are reenabled for -O[23] -O0 is good for development, and -O2 is the default optimization level for Fedora package builds. -Os, -O3, -O1, and -Og still generate some warnings. In fact, with -Os the number of warnings seems completely hopeless. Dozens and dozens.
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