Factor out strict_abi cmake code into a separate module.

CMakeLists.txt

@@ -43,6 +43,7 @@ include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 include(CTest)
 include(MacRpath)
+include(StrictAbi)
 
 set(CMAKE_MACOSX_RPATH ON)
 
@@ -575,45 +576,6 @@ if(BUILD_TOXAV)
     DESTINATION "include/tox")
 endif()
 
-################################################################################
-#
-# :: 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(${lib}_shared PROPERTIES
-    LINK_FLAGS -Wl,--version-script,${${lib}_VERSION_SCRIPT})
-endfunction()
-
-option(STRICT_ABI "Enforce strict ABI export in dynamic libraries" OFF)
-if(WIN32 OR APPLE)
-  # Windows and OSX don't have this linker functionality.
-  set(STRICT_ABI OFF)
-endif()
-
 if(STRICT_ABI AND SHELL AND ENABLE_SHARED)
   if(BUILD_TOXAV)
     make_version_script(${toxcore_SOURCE_DIR}/toxav/toxav.h toxav toxav)

cmake/StrictAbi.cmake

@@ -0,0 +1,38 @@
+################################################################################
+#
+# :: 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()