chore: Add strict-abi support for macOS/iOS.

Also enable it for all binary deployment builds. This avoids exporting
sodium/vpx/opus symbols through the toxcore library, which way conflict
with other exported symbols if client code links to e.g. libsodium
itself for its own purposes.

Author: iphydf

cmake/StrictAbi.cmake

@@ -20,8 +20,10 @@ endmacro()
 function(_make_version_script target)
   set(${target}_VERSION_SCRIPT "${CMAKE_BINARY_DIR}/${target}.ld")
 
-  file(WRITE ${${target}_VERSION_SCRIPT}
-    "{ global:\n")
+  if(NOT APPLE)
+    file(WRITE ${${target}_VERSION_SCRIPT}
+      "{ global:\n")
+  endif()
 
   foreach(sublib ${ARGN})
     string(REPLACE "^" ";" sublib ${sublib})
@@ -38,21 +40,34 @@ function(_make_version_script target)
     string(REPLACE "\n" ";" sublib_SYMS ${sublib_SYMS})
 
     foreach(sym ${sublib_SYMS})
-      file(APPEND ${${target}_VERSION_SCRIPT}
-        "${sym};\n")
+      if(APPLE)
+        file(APPEND ${${target}_VERSION_SCRIPT} "_")
+      endif()
+      file(APPEND ${${target}_VERSION_SCRIPT} "${sym}")
+      if(NOT APPLE)
+        file(APPEND ${${target}_VERSION_SCRIPT} ";")
+      endif()
+      file(APPEND ${${target}_VERSION_SCRIPT} "\n")
     endforeach(sym)
   endforeach(sublib)
 
-  file(APPEND ${${target}_VERSION_SCRIPT}
-    "local: *; };\n")
+  if(NOT APPLE)
+    file(APPEND ${${target}_VERSION_SCRIPT}
+      "local: *; };\n")
+  endif()
 
-  set_target_properties(${target}_shared PROPERTIES
-    LINK_FLAGS -Wl,--version-script,${${target}_VERSION_SCRIPT})
+  if(APPLE)
+    set_target_properties(${target}_shared PROPERTIES
+      LINK_FLAGS -Wl,-exported_symbols_list,${${target}_VERSION_SCRIPT})
+  else()
+    set_target_properties(${target}_shared PROPERTIES
+      LINK_FLAGS -Wl,--version-script,${${target}_VERSION_SCRIPT})
+  endif()
 endfunction()
 
 option(STRICT_ABI "Enforce strict ABI export in dynamic libraries" OFF)
-if((WIN32 AND NOT MINGW) OR APPLE)
-  # Windows and macOS don't have this linker functionality.
+if(WIN32 AND NOT MINGW)
+  # Windows doesn't have this linker functionality.
   set(STRICT_ABI OFF)
 endif()
 

other/deploy/android.sh

@@ -95,6 +95,7 @@ cmake -B _build -G Ninja \
   -DDHT_BOOTSTRAP=OFF \
   -DBOOTSTRAP_DAEMON=OFF \
   -DUNITTEST=OFF \
+  -DSTRICT_ABI=ON \
   -DMIN_LOGGER_LEVEL=TRACE \
   -DEXPERIMENTAL_API=ON
 cmake --build _build

other/deploy/ios.sh

@@ -44,6 +44,7 @@ cmake \
   -DDHT_BOOTSTRAP=OFF \
   -DBOOTSTRAP_DAEMON=OFF \
   -DUNITTEST=OFF \
+  -DSTRICT_ABI=ON \
   -DMIN_LOGGER_LEVEL=TRACE \
   -DEXPERIMENTAL_API=ON \
   -DCMAKE_C_FLAGS="$IOS_FLAGS" \

other/deploy/linux.sh

@@ -21,6 +21,7 @@ cmake \
   -DDHT_BOOTSTRAP=OFF \
   -DBOOTSTRAP_DAEMON=OFF \
   -DUNITTEST=OFF \
+  -DSTRICT_ABI=ON \
   -DMIN_LOGGER_LEVEL=TRACE \
   -DEXPERIMENTAL_API=ON
 

other/deploy/macos.sh

@@ -13,9 +13,11 @@ ARCH="$1"
 
 export PKG_CONFIG_PATH="$PWD/deps-prefix-macos-$ARCH/lib/pkgconfig"
 
+BUILD_DIR="_build-macos-$ARCH"
+
 # Build for macOS
 cmake \
-  -B _build \
+  -B "$BUILD_DIR" \
   -G Ninja \
   -DCMAKE_INSTALL_PREFIX="$PWD/toxcore-macos-$ARCH" \
   -DCMAKE_BUILD_TYPE=Release \
@@ -25,9 +27,10 @@ cmake \
   -DDHT_BOOTSTRAP=OFF \
   -DBOOTSTRAP_DAEMON=OFF \
   -DUNITTEST=OFF \
+  -DSTRICT_ABI=ON \
   -DMIN_LOGGER_LEVEL=TRACE \
   -DEXPERIMENTAL_API=ON \
   -DCMAKE_OSX_DEPLOYMENT_TARGET=10.15
 
-cmake --build _build
-cmake --install _build
+cmake --build "$BUILD_DIR"
+cmake --install "$BUILD_DIR"