My app cannot be launched on some users' MacOS, it says "Library not loaded: /usr/lib/libc++.1.dylib". "exception" : {"codes":"0x0000000000000000, 0x0000000000000000","rawCodes":[0,0],"type":"EXC_CRASH","signal":"SIGABRT"}, "termination" : {"code":1,"flags":518,"namespace":"DYLD","indicator":"Library missing","details":["(terminated at launch; ignore backtrace)"],"reasons":["Library not loaded: \/usr\/lib\/libc++.1.dylib","Referenced from: <E4CB6764-8CB9-32E9-881B-252E2F3E0C4B> \/Applications\/myapp.app\/Contents\/MacOS\/myapp","Reason: tried: '\/System\/iOSSupport\/usr\/lib\/libc++.1.dylib' (no such file), '\/System\/Volumes\/Preboot\/Cryptexes\/OS\/System\/iOSSupport\/usr\/lib\/libc++.1.dylib' (no such file), '\/System\/iOSSupport\/usr\/lib\/libc++.1.dylib' (no such file, no dyld cache), '\/usr\/lib\/libc++.1.dylib' (no such file), '\/System\/Volumes\/Preboot\/Cryptexes\/OS\/usr\/lib\/libc++.1.dylib' (no such file), '\/usr\/lib\/libc++.1.dylib' (no such file, no dyld cache)"]}, User 1's environment: 2020 MacBook Air, M1, system version 15.4. User 2's environment: 2020 MacBook Pro, M1, system version: 15.5. I (and the people around me) cannot reproduce this problem. It can be reproduced on User 2's computer, but the performance is strange, sometimes good and sometimes bad. The app can be launched normally during the day, and it can also be launched normally after restarting the computer. But it cannot be launched from 21:00 to 22:00 at night, and the problem still exists even if the computer is restarted. After some searching, I suspect that there is a bug in the dynamic linker cache mechanism of MacOS, but we cannot confirm it. According to the official documentation: https://developer.apple.com/documentation/macos-release-notes/macos-big-sur-11_0_1-release-notes New in macOS Big Sur 11.0.1, the system ships with a built-in dynamic linker cache of all system-provided libraries. As part of this change, copies of dynamic libraries are no longer present on the filesystem. Code that attempts to check for dynamic library presence by looking for a file at a path or enumerating a directory will fail. Instead, check for library presence by attempting to dlopen() the path, which will correctly check for the library in the cache. (62986286) I also tried to manually copy libc++.1.dylib to the above path, but these paths are read-only, and files cannot be copied into them even if SIP is turned off. Is there any other way to fix or avoid this problem? Thank you. Other similar questions: https://developer.apple.com/forums/thread/756370 https://developer.apple.com/forums/thread/764824