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The _Builtin_float symbols were moved twice, most recently from the OS Darwin library, but previously they were in the embedded @rpath Darwin library. @_originallyDefinedIn doesn't support multiple install names, but it can be replaced with -module-abi-name, and then multiple $ld$previous$ symbols can be used. Update the Platform and Concurrency magic symbols to use $ld$previous$ everywhere. rdar://130107191
73 lines
3.6 KiB
C
73 lines
3.6 KiB
C
//===--- magic-symbols-for-install-name.c - Magic linker directive symbols ===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2024 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// A file containing magic symbols that instruct the linker to use a
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// different install name when targeting older OSes. This file gets
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// compiled into all of the libraries that are embedded for backward
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// deployment.
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//
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//===----------------------------------------------------------------------===//
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#if defined(__APPLE__) && defined(__MACH__) && SWIFT_STDLIB_SUPPORT_BACK_DEPLOYMENT
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#include <mach-o/loader.h>
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#include <TargetConditionals.h>
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#include "swift/shims/Visibility.h"
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// Swift was supported as an embedded library in macOS (née OS X) 10.9, iOS 7.0, watchOS 2.0, tvOS 9.0.
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// It became part of the OS in macOS 10.14.4, iOS 12.2, watchOS 5.2, tvOS 12.2. Projects can continue
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// to embed Swift, but the linker will see the OS version and try to link on that by default. In order
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// to support back deployment, add a magic symbol to the OS library so that back deployment will link
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// on the embedded library instead. When running on a newer OS, the OS version of the library will be
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// used due to Xcode inserting a runpath search path of /usr/lib/swift based on the deployment target
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// being less than SupportedTargets[target][SwiftOSRuntimeMinimumDeploymentTarget] in SDKSettings.plist.
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// The linker uses a specially formatted symbol to do the back deployment:
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// $ld$previous$<install-name>$<compatibility-version>$<platform>$<start-version>$<end-version>$<symbol-name>$
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// compatibility-version and symbol-name are left off to apply to all library versions and symbols.
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// This symbol isn't a legal C identifier, so it needs to be specified with __asm.
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#define RPATH_PREVIOUS_DIRECTIVE_IMPL(name, platform, startVersion, endVersion) \
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SWIFT_RUNTIME_EXPORT const char ld_previous_ ## platform \
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__asm("$ld$previous$@rpath/lib" __STRING(name) ".dylib$$" __STRING(platform) "$" __STRING(startVersion) "$" __STRING(endVersion) "$$"); \
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const char ld_previous_ ## platform = 0;
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// Using the __STRING macro is important so that name and platform get expanded before being
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// stringified. The versions could just be #version, __STRING is only used for consistency.
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#define RPATH_PREVIOUS_DIRECTIVE(platform, startVersion, endVersion) \
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RPATH_PREVIOUS_DIRECTIVE_IMPL(SWIFT_TARGET_LIBRARY_NAME, platform, startVersion, endVersion)
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#if TARGET_OS_OSX || TARGET_OS_MACCATALYST
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_MACOS, 10.9, 10.14.4)
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#elif TARGET_OS_IOS && !TARGET_OS_VISION
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#if TARGET_OS_SIMULATOR
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_IOSSIMULATOR, 7.0, 12.2)
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#else
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_IOS, 7.0, 12.2)
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#endif
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#elif TARGET_OS_WATCH
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#if TARGET_OS_SIMULATOR
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_WATCHOSSIMULATOR, 2.0, 5.2)
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#else
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_WATCHOS, 2.0, 5.2)
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#endif
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#elif TARGET_OS_TV
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#if TARGET_OS_SIMULATOR
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_TVOSSIMULATOR, 9.0, 12.2)
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#else
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RPATH_PREVIOUS_DIRECTIVE(PLATFORM_TVOS, 9.0, 12.2)
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#endif
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#endif
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// Swift wasn't supported as an embedded library in any other OS, so no need to create back deployment
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// symbols for any of the other ones.
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#endif // defined(__APPLE__) && defined(__MACH__) && SWIFT_STDLIB_SUPPORT_BACK_DEPLOYMENT
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