feat: Generate .def, .exp and .lib files when building for Windows

Author: nurupo

cmake/StrictAbi.cmake

@@ -48,8 +48,8 @@ function(_make_version_script target)
 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.
+if((WIN32 AND NOT MINGW) OR APPLE)
+  # Windows and macOS don't have this linker functionality.
   set(STRICT_ABI OFF)
 endif()
 

other/docker/windows/build_toxcore.sh

@@ -75,6 +75,8 @@ build() {
     -DCMAKE_BUILD_TYPE="Release" \
     -DENABLE_SHARED=ON \
     -DENABLE_STATIC=ON \
+    -DSTRICT_ABI=ON \
+    -DEXPERIMENTAL_API=ON \
     -DCMAKE_EXE_LINKER_FLAGS="-static" \
     -DCMAKE_SHARED_LINKER_FLAGS="-static" \
     "${EXTRA_CMAKE_FLAGS_ARRAY[@]}" \
@@ -110,6 +112,23 @@ build() {
     fi
   fi
 
+  # generate def, lib and exp as they supposedly help with linking against the dlls,
+  # especially the lib is supposed to be of great help when linking on msvc.
+  # cd in order to keep the object names inside .lib and .dll.a short
+  cd "$RESULT_PREFIX_DIR"/bin/
+  for TOX_DLL in *.dll; do
+    gendef - "$TOX_DLL" >"${TOX_DLL%.*}.def"
+    # we overwrite the CMake-generated .dll.a for the better
+    # compatibility with the .lib being generated here
+    "$WINDOWS_TOOLCHAIN"-dlltool \
+      --input-def "${TOX_DLL%.*}.def" \
+      --output-lib "${TOX_DLL%.*}.lib" \
+      --output-exp "${TOX_DLL%.*}.exp" \
+      --output-delaylib "../lib/${TOX_DLL%.*}.dll.a" \
+      --dllname "$TOX_DLL"
+  done
+  cd -
+
   # move static dependencies
   cp -a "$DEP_PREFIX_DIR"/* "$RESULT_PREFIX_DIR"
 

other/docker/windows/get_packages.sh

@@ -17,6 +17,7 @@ apt-get install -y \
   libc-dev \
   libtool \
   make \
+  mingw-w64-tools \
   pkg-config \
   tree \
   yasm