Mac os compatibility checker3/17/2023 ![]() ![]() ![]() This is similar to DYLD_LIBRARY_PATH except instead of always Will be used in the process whenever a dylib with that install name is Whichever has the larger current_version value For each library found dyld looks at its LC_ID_DYLIB and gets The dynamic linker searches these directories for dynamic This is a colon separated list of directories that contain potential over. From man dyld: DYLD_VERSIONED_LIBRARY_PATH Yes, when using the DYLD_VERSIONED_LIBRARY_PATH or DYLD_VERSIONED_FRAMEWORK_PATH environment variables. Is the current version used by the system (e.g. with ls -l /usr/lib/libz* I see many different symlinks for the same library, each with a different version in the name.ġ. Do any parts of the system have any expectations about how the two types of versions in the metadata should relate to the file name, or to symlinks names created for the library? E.g.Is there documentation on where these version numbers are used? Note that I am asking for where/when they are actually used in practice, not merely for guidelines on how they are recommended to be set.When comparing the compatibility version, are all parts of the x.y.z scheme used? Is the comparison lexicographic? Or is there special meaning to x, y and z separately?.Is the current version used by the system (e.g.( reference, although this was for frameworks). The dynamic linker will refuse to link to a library whose compatibility version is smaller than what was recorded. When linking a program against a library, the compatibility version of that library will be recorded into the program.How and when are these versions used by the system, or by various tools/program?įor the compatibility version, I was able to find that: On macOS, a dylib has a compatibility version and a current version as metadata, each having a form of x.y.z.
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