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[WASM] Link start/stop symbol weakly #21

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Merged
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Dec 14, 2019
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[WASM] Link start/stop symbol weakly #21

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10 changes: 3 additions & 7 deletions stdlib/public/runtime/SwiftRT-WASM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,14 +14,10 @@

#include <cstddef>

// Create empty sections to ensure that the start/stop symbols are synthesized
// by the linker. Otherwise, we may end up with undefined symbol references as
// the linker table section was never constructed.

// Link start/stop symbols weakly to link them if they aren't synthesized by the linker.
#define DECLARE_SWIFT_SECTION(name) \
__attribute__((__used__,__section__(#name),__aligned__(1))) const char __dummy_##name = 0x00; \
__attribute__((__visibility__("hidden"),__aligned__(1))) extern const char __start_##name; \
__attribute__((__visibility__("hidden"),__aligned__(1))) extern const char __stop_##name;
__attribute__((__visibility__("hidden"),__aligned__(1),weak)) extern const char __start_##name; \
__attribute__((__visibility__("hidden"),__aligned__(1),weak)) extern const char __stop_##name;

extern "C" {
DECLARE_SWIFT_SECTION(swift5_protocols)
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