Add warning for missing autoreconf in hwloc fetch

Author: PatKamin

CMakeLists.txt

@@ -245,10 +245,7 @@ else()
     )
 endif()
 
-if(UMF_DISABLE_HWLOC)
-    message(STATUS "hwloc is disabled, hence OS provider, memtargets, "
-                   "topology discovery, examples won't be available!")
-else()
+if(NOT UMF_DISABLE_HWLOC)
     if(NOT DEFINED UMF_HWLOC_REPO)
         set(UMF_HWLOC_REPO "https://github.com/open-mpi/hwloc.git")
     endif()
@@ -272,9 +269,20 @@ else()
                 "${DLL_PATH_LIST};PATH=path_list_append:${LIBHWLOC_DLL_DIRS}")
         else()
             set(UMF_LINK_HWLOC_STATICALLY ON)
+            find_program(AUTORECONF_EXECUTABLE autoreconf)
+            if(NOT AUTORECONF_EXECUTABLE)
+                message(WARNING "autoreconf is not installed. Disabling hwloc.")
+                set(UMF_DISABLE_HWLOC ON CACHE BOOL "Disable hwloc due to missing autoreconf" FORCE)
+                set(UMF_LINK_HWLOC_STATICALLY OFF CACHE BOOL "Disable static hwloc linking due to missing autoreconf" FORCE)
+            endif()
         endif()
     endif()
+endif()
 
+if(UMF_DISABLE_HWLOC)
+    message(STATUS "hwloc is disabled, hence OS provider, memtargets, "
+                   "topology discovery, examples won't be available!")
+else()
     if(UMF_LINK_HWLOC_STATICALLY)
         message(
             STATUS