Merge pull request #12501 from BusyJay/fix-cares-build

cmake: fix cares configuration

CMakeLists.txt

@@ -132,7 +132,8 @@ if("${gRPC_CARES_PROVIDER}" STREQUAL "module")
   if(NOT CARES_ROOT_DIR)
     set(CARES_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/cares/cares)
   endif()
-  set(CARES_STATIC ON)
+  set(CARES_SHARED OFF CACHE BOOL "disable shared library")
+  set(CARES_STATIC ON CACHE BOOL "link cares statically")
   set(CARES_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/third_party/cares/cares")
   add_subdirectory(third_party/cares/cares)
   if(TARGET c-ares)

templates/CMakeLists.txt.template

@@ -177,7 +177,8 @@
     if(NOT CARES_ROOT_DIR)
       set(CARES_ROOT_DIR <%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/cares/cares)
     endif()
-    set(CARES_STATIC ON)
+    set(CARES_SHARED OFF CACHE BOOL "disable shared library")
+    set(CARES_STATIC ON CACHE BOOL "link cares statically")
     set(CARES_INCLUDE_DIR "<%text>${CMAKE_CURRENT_SOURCE_DIR}</%text>/third_party/cares/cares")
     add_subdirectory(third_party/cares/cares)
     if(TARGET c-ares)