updated build system

cmake/libraries/icu.cmake

@@ -0,0 +1,24 @@
+if(PROJECT_IS_DARWIN AND NOT PROJECT_BUILD)
+  if(PROJECT_BUILD_SHARED_LIBS)
+    set(ICU_ENABLE_SHARED yes)
+  else()
+    set(ICU_ENABLE_SHARED no)
+  endif()
+
+  ExternalProject_Add(icu_project
+    PREFIX external
+    URL ${PROJECT_3RD_PARTY_DIR}/mingw64/icu-release-${ICU_VERSION}.tar.gz
+    URL_HASH SHA256=${ICU_HASH}
+    BUILD_IN_SOURCE 1
+    LIST_SEPARATOR |
+    PATCH_COMMAND chmod +x ${PROJECT_3RD_PARTY_DIR}/icu_configure.sh
+    CONFIGURE_COMMAND cd icu4c/source && ${PROJECT_3RD_PARTY_DIR}/icu_configure.sh
+      ${PROJECT_MARCH}
+      ${PROJECT_EXTERNAL_BUILD_ROOT}
+      ${ICU_ENABLE_SHARED}
+    BUILD_COMMAND cd icu4c/source && make -j$ENV{CMAKE_BUILD_PARALLEL_LEVEL}
+    INSTALL_COMMAND cd icu4c/source && make install
+  )
+
+  list(APPEND PROJECT_DEPENDENCIES icu_project)
+endif()