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# Export only named entry points from shared library.
function(target_shared_library_exports lib libname symbols)
if (WIN32)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${libname}.def" "LIBRARY ${libname}\n EXPORTS\n")
foreach (symbol IN LISTS symbols)
file(APPEND "${CMAKE_CURRENT_BINARY_DIR}/${libname}.def" " ${symbol}\n")
endforeach ()
target_sources(${lib} PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/${libname}.def")
elseif (APPLE)
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${libname}.syms" "")
foreach (symbol IN LISTS symbols)
file(APPEND "${CMAKE_CURRENT_BINARY_DIR}/${libname}.syms" "_${symbol}\n")
endforeach ()
target_sources(${lib} PRIVATE "${CMAKE_CURRENT_BINARY_DIR}/${libname}.syms")
target_link_libraries(${lib} PRIVATE "-exported_symbols_list ${libname}.syms")
elseif (UNIX)
# Assume GNU ld.
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${libname}.ver" "{ global:\n")
foreach (symbol IN LISTS symbols)
file(APPEND "${CMAKE_CURRENT_BINARY_DIR}/${libname}.ver" " ${symbol};\n")
endforeach ()
file(APPEND "${CMAKE_CURRENT_BINARY_DIR}/${libname}.ver" "local:\n *;\n};\n")
target_link_libraries(${lib} PRIVATE "-Wl,--version-script=${libname}.ver")
else ()
message(WARNING "Unknown platform, ${lib} exports not set.")
endif ()
endfunction ()
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