![]() ![]() Booting in 64-bit-only modeĪll Macs running Mojave (and late High Sierra) can be started up in 64-bit-only mode. Summary: highly unreliable, with false positives and false negatives. A final shortcoming of System Information is its limited reporting. Separate listings are available in other sections, such as Applications, but there’s no reliable way to get a full overview of what is and is not 32-bit. The end result is that apps which you don’t use don’t get checked at all and form false negatives, and those which are updated to 64-bit versions often don’t trigger any reassessment, so form false positives. This works best when the app undergoes its first run check with ‘Gatekeeper’ apps which are updated in place without that first run may not register with it at all. The tool which is supposed to provide this information is Legacy Software, but it works in a strange and ingenious way, relying on apps and other code being run, so they can be checked by a new service SPLegacySoftwareReporter. None of them is currently comprehensive, and to put it bluntly, it’s a bit of a mess. There are several sections in System Information which can reveal which software is still 32-bit. My tests were run on an iMac Pro under macOS 10.14.5 with thousands of 32-bit code items, here looking particularly at the main /Applications folder, and the hidden /usr folder. This article looks at free tools for identifying 32-bit code on your Mac, so that you can prepare for macOS 10.15, whether that’s in two weeks or twenty. The first public beta is likely in July, and by the end of September millions of us are likely to be running the release version. In just a couple of weeks, the first beta-release of macOS 10.15 should be on the Macs of developers, bringing with it one potentially serious problem: it won’t run any 32-bit code.
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