[llvm-bugs] [Bug 49597] New: Support object files / dylibs built for multiple platforms

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49597

            Bug ID: 49597
           Summary: Support object files / dylibs built for multiple
                    platforms
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: jezreel at gmail.com
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

ld64 supports files with more than one LC_BUILD_VERSION.

We should also add support for the LC_VERSION_MIN_{MACOSX,IPHONEOS...}
commands.

Concrete use case: /usr/lib/system/libsystem_kernel.dylib on my Mac (Catalina)
has both LC_VERSION_MIN_MACOSX and LC_BUILD_VERSION (the latter for
MacCatalyst).

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