[Build] Use magic linker symbols to specify an @rpath-relative install name when targeting pre-stable-ABI OSes (5.1 04-24-2019 branch). #24795
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…l name when targeting pre-stable-ABI OSes. Magic symbols of the form $ld$install_name$os9.0$@rpath/libswiftCore.dylib tell the linker to use that install name when targeting that OS version. Use these symbols to specify an @rpath install name for all back-deployment libraries when targeting watchOS 2.0-5.1, iOS 7.0-12.1, and macOS 10.9-10.14. rdar://problem/45027809 (cherry picked from commit 4fb9999)
…install-name.c. (cherry picked from commit 26d44d5)
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@swift-ci please test |
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Copy of #23451 for the 5.1 04-24-2019 branch.