build BUGFIX always check crypt function exists

Author: michalvasko

CMakeLists.txt

@@ -314,19 +314,23 @@ if(ENABLE_SSH)
         list(APPEND libsrc src/session_server_ssh_auth_message.c)
     endif()
 
-    # crypt (if not found, assume no library needs to be linked)
-    if(${CMAKE_SYSTEM_NAME} MATCHES "QNX")
-        set(LIBCRYPT login)
-    else()
-        set(LIBCRYPT crypt)
-    endif()
-    check_library_exists(${LIBCRYPT} crypt "" HAVE_CRYPT)
-    if(HAVE_CRYPT)
+    # dependencies - crypt
+    check_function_exists(crypt HAVE_CRYPT)
+    if(NOT HAVE_CRYPT)
+        if(${CMAKE_SYSTEM_NAME} MATCHES "QNX")
+            set(LIBCRYPT login)
+        else()
+            set(LIBCRYPT crypt)
+        endif()
+        check_library_exists(${LIBCRYPT} crypt "" HAVE_LIBCRYPT)
+        if(NOT HAVE_LIBCRYPT)
+            message(FATAL_ERROR "Could NOT find Lib${LIBCRYPT} (library implementing crypt(3))")
+        endif()
         target_link_libraries(netconf2 ${LIBCRYPT})
         list(APPEND CMAKE_REQUIRED_LIBRARIES ${LIBCRYPT})
     endif()
 
-    # libpam
+    # dependencies - libpam
     if(ENABLE_PAM)
         find_package(LibPAM)
     endif()