cmake: use list(APPEND..) when appropriate

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 22ca579cf6c38d0592016c4648be4afea929de74)

diff --git a/src/test/librbd/CMakeLists.txt b/src/test/librbd/CMakeLists.txt
index 6954d22da46bdebe11c1785691aeda4cb6cdc539..6d8371fd22f68d5fb042e121f8409a22db2dda73 100644 (file)
--- a/src/test/librbd/CMakeLists.txt
+++ b/src/test/librbd/CMakeLists.txt
@@ -133,17 +133,14 @@ set(unittest_librbd_srcs
   )
 
 if(WITH_RBD_RWL OR WITH_RBD_SSD_CACHE)
-   set(unittest_librbd_srcs
-     ${unittest_librbd_srcs}
+   list(APPEND unittest_librbd_srcs
      cache/pwl/test_WriteLogMap.cc)
    if(WITH_RBD_RWL)
-     set(unittest_librbd_srcs
-       ${unittest_librbd_srcs}
+     list(APPEND unittest_librbd_srcs
        cache/pwl/test_mock_ReplicatedWriteLog.cc)
    endif()
    if(WITH_RBD_SSD_CACHE)
-     set(unittest_librbd_srcs
-       ${unittest_librbd_srcs}
+     list(APPEND unittest_librbd_srcs
        cache/pwl/test_mock_SSDWriteLog.cc)
    endif()
 endif()