Update CMakeLists.txt

Co-authored-by: Gang Wu <ustcwg@gmail.com>

Author: HuaHuaY

CMakeLists.txt

@@ -53,7 +53,7 @@ endif()
 set(ICEBERG_TEST_LINKAGE ${ICEBERG_TEST_LINKAGE_DEFAULT} CACHE STRING "Linkage of Iceberg libraries with unit tests executables")
 if(ICEBERG_BUILD_TESTS)
   if(ICEBERG_TEST_LINKAGE STREQUAL "shared" AND NOT ICEBERG_BUILD_SHARED)
-    message(FATAL_ERROR "If using ICEBERG_TEST_LINKAGE=shared, must also pass ICEBERG_BUILD_SHARED=on")
+    message(FATAL_ERROR "If using ICEBERG_TEST_LINKAGE=shared, must also pass ICEBERG_BUILD_SHARED=ON")
   endif()
   if(ICEBERG_TEST_LINKAGE STREQUAL "static" AND NOT ICEBERG_BUILD_STATIC)
     message(FATAL_ERROR "If using ICEBERG_TEST_LINKAGE=static, must also pass ICEBERG_BUILD_STATIC=on")