esp-idf/components/cxx/CMakeLists.txt
Alexey Lapshin dcf6b54e94 fix(cxx): use __cxa_throw() stub in case exceptions disabled
Reduces binary size since the linker will drop some code due to --gc-sections.
2024-05-07 21:03:08 +04:00

83 lines
3.2 KiB
CMake

idf_build_get_property(target IDF_TARGET)
if(${target} STREQUAL "linux")
return() # This component is not necessary on the POSIX/Linux simulator
endif()
idf_component_register(SRCS "cxx_exception_stubs.cpp"
"cxx_guards.cpp"
# Make sure that pthread is in component list
PRIV_REQUIRES pthread)
if(NOT CONFIG_CXX_EXCEPTIONS)
set(WRAP_FUNCTIONS
_Unwind_SetEnableExceptionFdeSorting
__register_frame_info_bases
__register_frame_info
__register_frame
__register_frame_info_table_bases
__register_frame_info_table
__register_frame_table
__deregister_frame_info_bases
__deregister_frame_info
_Unwind_Find_FDE
_Unwind_GetGR
_Unwind_GetCFA
_Unwind_GetIP
_Unwind_GetIPInfo
_Unwind_GetRegionStart
_Unwind_GetDataRelBase
_Unwind_GetTextRelBase
_Unwind_SetIP
_Unwind_SetGR
_Unwind_GetLanguageSpecificData
_Unwind_FindEnclosingFunction
_Unwind_Resume
_Unwind_RaiseException
_Unwind_DeleteException
_Unwind_ForcedUnwind
_Unwind_Resume_or_Rethrow
_Unwind_Backtrace
__cxa_call_unexpected
__gxx_personality_v0
__cxa_throw
__cxa_allocate_exception)
foreach(wrap ${WRAP_FUNCTIONS})
target_link_libraries(${COMPONENT_LIB} INTERFACE "-Wl,--wrap=${wrap}")
endforeach()
endif()
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
# libstdc++ depends on C library, so it should appear later in link order.
# Otherwise we get undefined references for esp-clang toolchain.
target_link_libraries(${COMPONENT_LIB} PUBLIC stdc++ c ${CONFIG_COMPILER_RT_LIB_NAME})
else()
target_link_libraries(${COMPONENT_LIB} PUBLIC stdc++ gcc)
endif()
target_link_libraries(${COMPONENT_LIB} INTERFACE "-u __cxa_guard_dummy")
# Force libpthread to appear later than libstdc++ in link line since libstdc++ depends on libpthread.
# Furthermore, force libcxx to appear later than libgcc because some libgcc unwind code is wrapped, if C++
# exceptions are disabled. libcxx (this component) provides the unwind code wrappers.
# This is to prevent linking of libgcc's unwind code which considerably increases the binary size.
# Also force libnewlib to appear later than libstdc++ in link line since libstdc++ depends on
# some functions in libnewlib, e.g. getentropy().
idf_component_get_property(pthread pthread COMPONENT_LIB)
idf_component_get_property(newlib newlib COMPONENT_LIB)
idf_component_get_property(cxx cxx COMPONENT_LIB)
add_library(stdcpp_deps INTERFACE)
if(CMAKE_C_COMPILER_ID MATCHES "Clang")
target_link_libraries(stdcpp_deps INTERFACE stdc++ c $<TARGET_FILE:${pthread}> $<TARGET_FILE:${newlib}>)
else()
target_link_libraries(stdcpp_deps INTERFACE stdc++ $<TARGET_FILE:${pthread}> $<TARGET_FILE:${newlib}>)
endif()
target_link_libraries(${COMPONENT_LIB} PUBLIC stdcpp_deps)
add_library(libgcc_cxx INTERFACE)
target_link_libraries(libgcc_cxx INTERFACE ${CONFIG_COMPILER_RT_LIB_NAME} $<TARGET_FILE:${cxx}>)
target_link_libraries(${COMPONENT_LIB} PUBLIC libgcc_cxx)
if(NOT CONFIG_COMPILER_CXX_EXCEPTIONS)
target_link_libraries(${COMPONENT_LIB} INTERFACE "-u __cxx_fatal_exception")
endif()