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function(find_objcopy_with_weaken)
find_program(OBJCOPY_EXECUTABLE "objcopy")
message(STATUS "Looking for objcopy that supports weaken - ${OBJCOPY_EXECUTABLE}")
if(NOT OBJCOPY_EXECUTABLE)
return()
endif()
set(objcopy_test_src "${CMAKE_CURRENT_BINARY_DIR}/objcopy_test.c")
set(objcopy_test_exe "${CMAKE_CURRENT_BINARY_DIR}/objcopy_test")
file(WRITE ${objcopy_test_src} "void foo() {} int main() { return 0; }")
try_compile(objcopy_test_compiled
${CMAKE_CURRENT_BINARY_DIR} ${objcopy_test_src}
COPY_FILE ${objcopy_test_exe})
if(objcopy_test_compiled AND EXISTS ${objcopy_test_exe})
execute_process(
COMMAND ${OBJCOPY_EXECUTABLE} -W foo ${objcopy_test_exe}
RESULT_VARIABLE objcopy_result)
file(REMOVE ${objcopy_test_exe})
endif()
if(objcopy_result EQUAL 0)
set(objcopy_weaken ON)
endif()
file(REMOVE ${objcopy_test_src})
if(objcopy_weaken)
set(objcopy_has_weaken "Success")
set(HAVE_OBJCOPY_WEAKEN TRUE PARENT_SCOPE)
set(OBJCOPY_EXECUTABLE "${OBJCOPY_EXECUTABLE}" PARENT_SCOPE)
else()
set(objcopy_has_weaken "Failed")
endif()
message(STATUS "objcopy has weaken support - ${objcopy_has_weaken}")
endfunction(find_objcopy_with_weaken)
function(weaken_object target)
if(NOT HAVE_OBJCOPY_WEAKEN)
return()
endif()
# If we have objcopy, make malloc/free/etc weak symbols. That way folks
# can override our malloc if they want to (they can still use tc_malloc).
# Note: the weird-looking symbols are the c++ memory functions:
# (in order) new, new(nothrow), new[], new[](nothrow), delete, delete[]
# In theory this will break if mangling changes, but that seems pretty
# unlikely at this point. Just in case, I throw in versions with an
# extra underscore as well, which may help on OS X.
add_custom_command(TARGET ${target} POST_BUILD
COMMAND "${OBJCOPY_EXECUTABLE}"
-W malloc -W free -W realloc -W calloc -W cfree
-W memalign -W posix_memalign -W valloc -W pvalloc
-W aligned_alloc
-W malloc_stats -W mallopt -W mallinfo -W nallocx
-W _Znwm -W _ZnwmRKSt9nothrow_t -W _Znam -W _ZnamRKSt9nothrow_t
-W _ZdlPv -W _ZdaPv
-W __Znwm -W __ZnwmRKSt9nothrow_t -W __Znam -W __ZnamRKSt9nothrow_t
-W __ZdlPv -W __ZdaPv "$<TARGET_FILE:${target}>")
endfunction()
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