File 0012-WITH_SYSTEM_LIBURING.patch of Package ceph-ceph-15.2.17

diff --git a/cmake/modules/Builduring.cmake b/cmake/modules/Builduring.cmake
new file mode 100644
index 00000000000..daddb070cf1
--- /dev/null
+++ b/cmake/modules/Builduring.cmake
@@ -0,0 +1,39 @@
+function(build_uring)
+  include(FindMake)
+  find_make("MAKE_EXECUTABLE" "make_cmd")
+
+  if(EXISTS "${PROJECT_SOURCE_DIR}/src/liburing/configure")
+    set(source_dir_args
+      SOURCE_DIR "${PROJECT_SOURCE_DIR}/src/liburing")
+  else()
+    set(source_dir_args
+      SOURCE_DIR ${CMAKE_BINARY_DIR}/src/liburing
+      GIT_REPOSITORY https://github.com/axboe/liburing.git
+      GIT_TAG "4e360f71131918c36774f51688e5c65dea8d43f2"
+      GIT_SHALLOW TRUE
+      GIT_CONFIG advice.detachedHead=false)
+  endif()
+
+  include(ExternalProject)
+  ExternalProject_Add(liburing_ext
+    ${source_dir_args}
+    CONFIGURE_COMMAND <SOURCE_DIR>/configure
+    BUILD_COMMAND env CC=${CMAKE_C_COMPILER} "CFLAGS=${CMAKE_C_FLAGS} -fPIC" ${make_cmd} -C src -s
+    BUILD_IN_SOURCE 1
+    BUILD_BYPRODUCTS "<SOURCE_DIR>/src/liburing.a"
+    INSTALL_COMMAND ""
+    UPDATE_COMMAND "")
+  unset(make_cmd)
+
+  ExternalProject_Get_Property(liburing_ext source_dir)
+  set(URING_INCLUDE_DIR "${source_dir}/src/include")
+  set(URING_LIBRARY_DIR "${source_dir}/src")
+
+  add_library(uring::uring STATIC IMPORTED GLOBAL)
+  add_dependencies(uring::uring liburing_ext)
+  file(MAKE_DIRECTORY ${URING_INCLUDE_DIR})
+  set_target_properties(uring::uring PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES ${URING_INCLUDE_DIR}
+    IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+    IMPORTED_LOCATION "${URING_LIBRARY_DIR}/liburing.a")
+endfunction()
diff --git a/cmake/modules/FindMake.cmake b/cmake/modules/FindMake.cmake
new file mode 100644
index 00000000000..2a57a8df7f4
--- /dev/null
+++ b/cmake/modules/FindMake.cmake
@@ -0,0 +1,17 @@
+function(find_make make_exe make_cmd)
+  # make_exe the name of the variable whose value will be the path to "make"
+  #          executable
+  # make_cmd the name of the variable whose value will be the command to
+  #          used in the generated build script executed by the cmake generator
+  find_program(MAKE_EXECUTABLE NAMES gmake make)
+  if(NOT MAKE_EXECUTABLE)
+    message(FATAL_ERROR "Can't find make")
+  endif()
+  set(${make_exe} "${MAKE_EXECUTABLE}" PARENT_SCOPE)
+  if(CMAKE_MAKE_PROGRAM MATCHES "make")
+    # try to inherit command line arguments passed by parent "make" job
+    set(${make_cmd} "$(MAKE)" PARENT_SCOPE)
+  else()
+    set(${make_cmd} "${MAKE_EXECUTABLE}" PARENT_SCOPE)
+  endif()
+endfunction()
diff --git a/cmake/modules/Finduring.cmake b/cmake/modules/Finduring.cmake
new file mode 100644
index 00000000000..10c8de42550
--- /dev/null
+++ b/cmake/modules/Finduring.cmake
@@ -0,0 +1,21 @@
+# - Find uring
+#
+# URING_INCLUDE_DIR - Where to find liburing.h
+# URING_LIBRARIES - List of libraries when using uring.
+# uring_FOUND - True if uring found.
+
+find_path(URING_INCLUDE_DIR liburing.h)
+find_library(URING_LIBRARIES liburing.a liburing)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(uring DEFAULT_MSG URING_LIBRARIES URING_INCLUDE_DIR)
+
+if(uring_FOUND AND NOT TARGET uring::uring)
+  add_library(uring::uring UNKNOWN IMPORTED)
+  set_target_properties(uring::uring PROPERTIES
+    INTERFACE_INCLUDE_DIRECTORIES "${URING_INCLUDE_DIR}"
+    IMPORTED_LINK_INTERFACE_LANGUAGES "C"
+    IMPORTED_LOCATION "${URING_LIBRARIES}")
+endif()
+
+mark_as_advanced(URING_INCLUDE_DIR URING_LIBRARIES)
diff --git a/src/os/CMakeLists.txt b/src/os/CMakeLists.txt
index 760244b9b43..740f5225d91 100644
--- a/src/os/CMakeLists.txt
+++ b/src/os/CMakeLists.txt
@@ -134,27 +134,11 @@ if(WITH_EVENTTRACE)
 endif()
 
 if(WITH_LIBURING)
-  include(ExternalProject)
-  if("${CMAKE_GENERATOR}" MATCHES "Make")
-    set(make_cmd "$(MAKE)")
+  if(WITH_SYSTEM_LIBURING)
+    find_package(uring REQUIRED)
   else()
-    set(make_cmd "make")
+    include(Builduring)
+    build_uring()
   endif()
-  ExternalProject_Add(liburing_ext
-    DOWNLOAD_DIR ${CMAKE_BINARY_DIR}/src/
-    GIT_REPOSITORY http://git.kernel.dk/liburing
-    GIT_TAG "4e360f71131918c36774f51688e5c65dea8d43f2"
-    SOURCE_DIR ${CMAKE_BINARY_DIR}/src/liburing
-    CONFIGURE_COMMAND <SOURCE_DIR>/configure
-    BUILD_COMMAND env CC=${CMAKE_C_COMPILER} ${make_cmd} -C src -s
-    BUILD_IN_SOURCE 1
-    INSTALL_COMMAND "")
-  unset(make_cmd)
-  add_library(liburing STATIC IMPORTED GLOBAL)
-  add_dependencies(liburing liburing_ext)
-  set_target_properties(liburing PROPERTIES
-    IMPORTED_LINK_INTERFACE_LANGUAGES "C"
-    IMPORTED_LOCATION "${CMAKE_BINARY_DIR}/src/liburing/src/liburing.a")
-  target_link_libraries(os liburing)
-  target_include_directories(os SYSTEM PRIVATE "${CMAKE_BINARY_DIR}/src/liburing/src/include")
-endif(WITH_LIBURING)
+  target_link_libraries(os uring::uring)
+endif()