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[Runtime] Weakly import dyld protocol conformance functions. #38696

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Merged
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Jul 30, 2021
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[Runtime] Weakly import dyld protocol conformance functions. #38696

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17 changes: 17 additions & 0 deletions stdlib/public/runtime/ProtocolConformance.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,23 @@
#if __has_include(<mach-o/dyld_priv.h>)
#include <mach-o/dyld_priv.h>
#define DYLD_EXPECTED_SWIFT_OPTIMIZATIONS_VERSION 1u

// Redeclare these functions as weak so we can build against a macOS 12 SDK and
// still test on macOS 11.
LLVM_ATTRIBUTE_WEAK
struct _dyld_protocol_conformance_result
_dyld_find_protocol_conformance(const void *protocolDescriptor,
const void *metadataType,
const void *typeDescriptor);

LLVM_ATTRIBUTE_WEAK
struct _dyld_protocol_conformance_result
_dyld_find_foreign_type_protocol_conformance(const void *protocol,
const char *foreignTypeIdentityStart,
size_t foreignTypeIdentityLength);

LLVM_ATTRIBUTE_WEAK
uint32_t _dyld_swift_optimizations_version(void);
#endif

// Set this to 1 to enable logging of calls to the dyld shared cache conformance
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