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[Linux] Make the backtracing symbol reference conditional. #68798

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Merged
merged 1 commit into from
Sep 27, 2023
Merged

[Linux] Make the backtracing symbol reference conditional. #68798

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14 changes: 11 additions & 3 deletions stdlib/public/runtime/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -100,8 +100,10 @@ set(LLVM_OPTIONAL_SOURCES
${swift_runtime_leaks_sources}
${swift_runtime_backtracing_sources})

set(swift_enable_backtracing)
if(SWIFT_ENABLE_BACKTRACING)
list(APPEND swift_runtime_sources ${swift_runtime_backtracing_sources})
set(swift_enable_backtracing -DSWIFT_ENABLE_BACKTRACING)
endif()

set(swift_runtime_library_compile_flags ${swift_runtime_compile_flags})
Expand Down Expand Up @@ -172,7 +174,9 @@ endforeach()
add_swift_target_library(swiftImageRegistrationObjectELF
OBJECT_LIBRARY IS_STDLIB IS_STDLIB_CORE
SwiftRT-ELF-WASM.cpp
C_COMPILE_FLAGS ${SWIFT_RUNTIME_CORE_CXX_FLAGS}
C_COMPILE_FLAGS
${SWIFT_RUNTIME_CORE_CXX_FLAGS}
${swift_enable_backtracing}
C_COMPILE_FLAGS_LINUX -fno-lto
LINK_FLAGS ${SWIFT_RUNTIME_CORE_LINK_FLAGS}
TARGET_SDKS ${ELFISH_SDKS}
Expand All @@ -183,7 +187,9 @@ add_swift_target_library(swiftImageRegistrationObjectELF
add_swift_target_library(swiftImageRegistrationObjectCOFF
OBJECT_LIBRARY IS_STDLIB IS_STDLIB_CORE
SwiftRT-COFF.cpp
C_COMPILE_FLAGS ${SWIFT_RUNTIME_CORE_CXX_FLAGS}
C_COMPILE_FLAGS
${SWIFT_RUNTIME_CORE_CXX_FLAGS}
${swift_enable_backtracing}
LINK_FLAGS ${SWIFT_RUNTIME_CORE_LINK_FLAGS}
TARGET_SDKS ${COFF_SDKS}
SWIFT_COMPILE_FLAGS ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
Expand All @@ -192,7 +198,9 @@ add_swift_target_library(swiftImageRegistrationObjectCOFF
add_swift_target_library(swiftImageRegistrationObjectWASM
OBJECT_LIBRARY IS_STDLIB IS_STDLIB_CORE
SwiftRT-ELF-WASM.cpp
C_COMPILE_FLAGS ${SWIFT_RUNTIME_CORE_CXX_FLAGS}
C_COMPILE_FLAGS
${SWIFT_RUNTIME_CORE_CXX_FLAGS}
${swift_enable_backtracing}
LINK_FLAGS ${SWIFT_RUNTIME_CORE_LINK_FLAGS}
TARGET_SDKS ${WASM_SDKS}
SWIFT_COMPILE_FLAGS ${SWIFT_STANDARD_LIBRARY_SWIFT_FLAGS}
Expand Down
2 changes: 2 additions & 0 deletions stdlib/public/runtime/SwiftRT-ELF-WASM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,12 @@ extern "C" const char __dso_handle[];
static constexpr const void *__dso_handle = nullptr;
#endif

#if SWIFT_ENABLE_BACKTRACING
// Drag in a symbol from the backtracer, to force the static linker to include
// the code.
static const void *__backtraceRef __attribute__((used))
= (const void *)swift::runtime::backtrace::_swift_backtrace_isThunkFunction;
#endif

// 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
Expand Down