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macro(export_symbol TARGET FILENAME)
set(FLAG "")
if(WIN32)
string(REPLACE ".sym" ".def" DEF_FILENAME ${FILENAME})
file(WRITE ${DEF_FILENAME} "EXPORTS\n")
file(READ ${FILENAME} SYMBOLS)
file(APPEND ${DEF_FILENAME} "${SYMBOLS}")
target_sources(${TARGET} PRIVATE ${DEF_FILENAME})
elseif(APPLE)
set(FLAG "-exported_symbols_list ${FILENAME}")
set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
elseif(CMAKE_SYSTEM_NAME MATCHES "HP-UX")
file(READ ${FILENAME} SYMBOLS)
string(REGEX REPLACE "\n$" "" SYMBOLS ${SYMBOLS})
string(REPLACE "\n" "\n+e " SYMBOLS ${SYMBOLS})
string(REPLACE ".sym" ".opt" OPT_FILENAME ${FILENAME})
file(WRITE ${OPT_FILENAME} "+e ${SYMBOLS}")
set(FLAG "-Wl,-c,${OPT_FILENAME}")
set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
elseif(CMAKE_SYSTEM_NAME MATCHES "SunOS")
file(READ ${FILENAME} SYMBOLS)
string(REPLACE "\n" ";\n" SYMBOLS ${SYMBOLS})
string(REPLACE ".sym" ".ver" VER_FILENAME ${FILENAME})
file(WRITE ${VER_FILENAME}
"{\nglobal:\n${SYMBOLS}\nlocal:\n*;\n};\n")
set(FLAG "-Wl,-M${VER_FILENAME}")
set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
elseif(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
file(READ ${FILENAME} SYMBOLS)
string(REPLACE "\n" ";\n" SYMBOLS ${SYMBOLS})
string(REPLACE ".sym" ".ver" VER_FILENAME ${FILENAME})
file(WRITE ${VER_FILENAME}
"{\nglobal:\n${SYMBOLS}\nlocal:\n*;\n};\n")
set(FLAG "-Wl,--version-script,\"${VER_FILENAME}\"")
set_target_properties(${TARGET} PROPERTIES LINK_FLAGS ${FLAG})
endif()
endmacro()
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