Merge commit '227425b90e9a671118026689dd30967e127a1090' as 'external/toxcore/c-toxcore'

external/toxcore/c-toxcore/cmake/StrictAbi.cmake

@@ -0,0 +1,76 @@
+################################################################################
+#
+# :: 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).
+#
+################################################################################
+
+find_program(SHELL NAMES sh dash bash zsh fish)
+
+macro(make_version_script)
+  if(STRICT_ABI AND SHELL AND ENABLE_SHARED)
+    _make_version_script(${ARGN})
+  endif()
+endmacro()
+
+function(_make_version_script target)
+  set(${target}_VERSION_SCRIPT "${CMAKE_BINARY_DIR}/${target}.ld")
+
+  file(WRITE ${${target}_VERSION_SCRIPT}
+    "{ global:\n")
+
+  foreach(sublib ${ARGN})
+    string(REPLACE "^" ";" sublib ${sublib})
+    list(GET sublib 0 header)
+    list(GET sublib 1 ns)
+
+    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 sublib_SYMS
+      OUTPUT_STRIP_TRAILING_WHITESPACE)
+    string(REPLACE "\n" ";" sublib_SYMS ${sublib_SYMS})
+
+    foreach(sym ${sublib_SYMS})
+      file(APPEND ${${target}_VERSION_SCRIPT}
+        "${sym};\n")
+    endforeach(sym)
+  endforeach(sublib)
+
+  file(APPEND ${${target}_VERSION_SCRIPT}
+    "local: *; };\n")
+
+  set_target_properties(${target}_shared PROPERTIES
+    LINK_FLAGS -Wl,--version-script,${${target}_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()
+
+if(STRICT_ABI AND NOT ENABLE_STATIC)
+  if(AUTOTEST)
+    message("AUTOTEST option is incompatible with STRICT_ABI. Disabling AUTOTEST.")
+  endif()
+  set(AUTOTEST OFF)
+
+  if(BUILD_MISC_TESTS)
+    message("BUILD_MISC_TESTS option is incompatible with STRICT_ABI. Disabling BUILD_MISC_TESTS.")
+  endif()
+  set(BUILD_MISC_TESTS OFF)
+
+  if(BOOTSTRAP_DAEMON)
+    message("BOOTSTRAP_DAEMON option is incompatible with STRICT_ABI. Disabling BOOTSTRAP_DAEMON.")
+  endif()
+  set(BOOTSTRAP_DAEMON OFF)
+
+  if(DHT_BOOTSTRAP)
+    message("DHT_BOOTSTRAP option is incompatible with STRICT_ABI. Disabling DHT_BOOTSTRAP.")
+  endif()
+  set(DHT_BOOTSTRAP OFF)
+endif()