Add ICU version check to ensure minimum of version 61 is used.

Author: spevans

CMakeLists.txt

@@ -20,6 +20,12 @@ find_package(CURL REQUIRED)
 find_package(ICU COMPONENTS uc i18n REQUIRED)
 find_package(LibXml2 REQUIRED)
 
+set(ICU_MINIMUM_VERSION 61)
+if(ICU_VERSION VERSION_LESS ${ICU_MINIMUM_VERSION})
+  message(FATAL_ERROR "ICU version ${ICU_VERSION} is less than required version ${ICU_MINIMUM_VERSION}")
+endif()
+
+
 include(SwiftSupport)
 include(GNUInstallDirs)
 include(ExternalProject)

CoreFoundation/CMakeLists.txt

@@ -378,6 +378,12 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
                              PRIVATE
                                ${CURL_INCLUDE_DIRS})
   find_package(ICU COMPONENTS uc i18n REQUIRED)
+
+  set(ICU_MINIMUM_VERSION 61)
+  if(ICU_VERSION VERSION_LESS ${ICU_MINIMUM_VERSION})
+    message(FATAL_ERROR "ICU version ${ICU_VERSION} is less than required version ${ICU_MINIMUM_VERSION}")
+  endif()
+  message(STATUS "ICU_INCLUDE_DIR: ${ICU_INCLUDE_DIR}")
   target_include_directories(CoreFoundation
                              PRIVATE
                                ${ICU_INCLUDE_DIR})