update cavl population

Author: pavel-kirienko

cmake/modules/Findcavl.cmake

@@ -9,19 +9,17 @@ include(FetchContent)
 set(cavl_GIT_REPOSITORY "https://github.com/pavel-kirienko/cavl")
 set(cavl_GIT_TAG "c-2.1.0")
 
-FetchContent_Declare(
-    cavl
-    GIT_REPOSITORY  ${cavl_GIT_REPOSITORY}
-    GIT_TAG         ${cavl_GIT_TAG}
-)
+FetchContent_Declare(cavl GIT_REPOSITORY ${cavl_GIT_REPOSITORY} GIT_TAG ${cavl_GIT_TAG})
 FetchContent_GetProperties(cavl)
 if (NOT cavl_POPULATED)
-    FetchContent_Populate(cavl)
+    if (FETCHCONTENT_FULLY_DISCONNECTED AND NOT EXISTS "${cavl_SOURCE_DIR}")
+        set(cavl_FOUND FALSE PARENT_SCOPE)
+        message(WARNING "cavl unavailable: FETCHCONTENT_FULLY_DISCONNECTED=ON and '${cavl_SOURCE_DIR}' does not exist.")
+        return()
+    endif()
+    FetchContent_MakeAvailable(cavl)
 endif ()
 
-
-#add_library(cavl2_c INTERFACE)
-#target_include_directories(cavl2_c INTERFACE "${cavl_SOURCE_DIR}/c")
 add_project_library(
     NAME cavl2_c
     HEADER_PATH "${cavl_SOURCE_DIR}/c"