File 0015-WITH_SYSTEM_FMT.patch of Package ceph-ceph-15.2.17

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 6e535dd2c85..13c7bba9cef 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -289,12 +289,15 @@ add_subdirectory(json_spirit)
 include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/src/xxHash")
 include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/src/rapidjson/include")
 
-find_package(fmt 5.2.1 QUIET)
-if(fmt_FOUND)
-  include_directories(SYSTEM "${fmt_INCLUDE_DIR}")
+option(WITH_SYSTEM_FMT "require and build with system fmt" OFF)
+if (WITH_SYSTEM_FMT)
+  find_package(fmt 5.2.1 REQUIRED)
 else()
-  message(STATUS "Could not find fmt, will build it")
+  set(old_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})
+  set(BUILD_SHARED_LIBS FALSE)
   add_subdirectory(fmt)
+  set(BUILD_SHARED_LIBS ${old_BUILD_SHARED_LIBS})
+  unset(old_BUILD_SHARED_LIBS)
   include_directories(SYSTEM "${CMAKE_SOURCE_DIR}/src/fmt/include")
 endif()