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################################################################################
#
# :: Strict ABI
#
# Enabling the STRICT_ABI flag will generate and use an LD version script.
# It ensures that the dynamic libraries (libtoxcore.so, libtoxav.so) only
# export the symbols that are defined in their public API (tox.h and toxav.h,
# respectively).
#
################################################################################
function(make_version_script header ns lib)
execute_process(
COMMAND ${SHELL} -c "egrep '^\\w' ${header} | grep '${ns}_[a-z0-9_]*(' | grep -v '^typedef' | grep -o '${ns}_[a-z0-9_]*(' | egrep -o '\\w+' | sort -u"
OUTPUT_VARIABLE ${lib}_SYMS
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REPLACE "\n" ";" ${lib}_SYMS ${${lib}_SYMS})
set(${lib}_VERSION_SCRIPT "${CMAKE_BINARY_DIR}/${lib}.ld")
file(WRITE ${${lib}_VERSION_SCRIPT}
"{ global:\n")
foreach(sym ${${lib}_SYMS})
file(APPEND ${${lib}_VERSION_SCRIPT}
"${sym};\n")
endforeach(sym)
file(APPEND ${${lib}_VERSION_SCRIPT}
"local: *; };\n")
set_target_properties(${lib}_shared PROPERTIES
LINK_FLAGS -Wl,--version-script,${${lib}_VERSION_SCRIPT})
endfunction()
option(STRICT_ABI "Enforce strict ABI export in dynamic libraries" OFF)
if(WIN32 OR APPLE)
# Windows and OSX don't have this linker functionality.
set(STRICT_ABI OFF)
endif()
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