Fixed inftrees.c should be compiled with infcover when zlib is a shared library.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d453a9be4fecf920d0cb74e41936d5783e2d53f..9b68cc60da31fe032b4b12c62f8a4402f7ff6bf4 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1236,7 +1236,7 @@ if(ZLIB_ENABLE_TESTS)
     target_link_libraries(switchlevels zlib)
 
     add_simple_test_executable(infcover)
-    if(NOT BUILD_SHARED_LIBS)
+    if(NOT DEFINED BUILD_SHARED_LIBS OR BUILD_SHARED_LIBS)
         target_sources(infcover PRIVATE inftrees.c)
     endif()