[GenVectorX] Change cmake adaptivecpp config

Author: mdessole

.github/workflows/root-ci-config/buildconfig/fedora42.txt

@@ -7,4 +7,4 @@ experimental_adaptivecpp=ON
 experimental_genvectorx=ON
 pythia8=OFF
 unuran=OFF
-vdt=OFF
+vdt=OFF

.github/workflows/root-ci-config/buildconfig/ubuntu2404-cuda.txt

@@ -16,4 +16,4 @@ sqlite=OFF
 test_distrdf_dask=OFF
 test_distrdf_pyspark=OFF
 unfold=OFF
-webgui=ON
+webgui=ON

.github/workflows/root-ci-config/buildconfig/ubuntu2404.txt

@@ -2,4 +2,4 @@ experimental_adaptivecpp=ON
 experimental_genvectorx=ON
 pythia8=OFF
 tmva-sofie=ON
-ccache=On
+ccache=On

.github/workflows/root-ci-config/buildconfig/ubuntu2504.txt

@@ -1,4 +1,4 @@
 experimental_adaptivecpp=ON
 experimental_genvectorx=ON
 ccache=ON
-pythia8=OFF
+pythia8=OFF

cmake/modules/SearchInstalledSoftware.cmake

@@ -1643,8 +1643,11 @@ if (vecgeom)
   endif()
 endif()
 
-#---Check for AdaptiveCpp-------------------------------------------------------------------
+if(experimental_builtin_adaptivecpp)
+  ROOT_CHECK_CONNECTION_AND_DISABLE_OPTION("experimental_builtin_adaptivecpp")
+endif()
 
+#---Check for AdaptiveCpp-------------------------------------------------------------------
 if (experimental_adaptivecpp OR experimental_builtin_adaptivecpp)
   if (experimental_oneapi)
     message(WARNING "Disable OneAPI to load AdaptiveCpp")
@@ -1656,16 +1659,16 @@ if (experimental_adaptivecpp OR experimental_builtin_adaptivecpp)
       find_package(AdaptiveCpp)
 
       if(NOT AdaptiveCpp_FOUND)
-        if(fail-on-missing)
-          message(FATAL_ERROR "AdaptiveCpp not found. Ensure that the installation of AdaptiveCpp is in the CMAKE_PREFIX_PATH")
-        else()
-          message(STATUS "AdaptiveCpp not found. Ensure that the installation of AdaptiveCpp is in the CMAKE_PREFIX_PATH")
-          if(NO_CONNECTION)
-            set(experimental_adaptivecpp OFF CACHE BOOL "Disabled because not found and no internet connection" FORCE)
-          else()
-            message(STATUS "               Switching ON 'experimental_builtin_adaptivecpp' option")
-            set(experimental_builtin_adaptivecpp ON CACHE BOOL "Enabled because external AdaptiveCpp not found" FORCE)
+        message(STATUS "AdaptiveCpp not found. Ensure that the installation of AdaptiveCpp is in the CMAKE_PREFIX_PATH")
+        if(NO_CONNECTION)
+          set(experimental_builtin_adaptivecpp OFF CACHE BOOL "Disabled because not found and no internet connection" FORCE)
+          set(sycl OFF CACHE BOOL FORCE)
+          if(fail-on-missing)
+            message(FATAL_ERROR "AdaptiveCpp cannot be built.")
           endif()
+        else()
+          message(STATUS "               Switching ON 'experimental_builtin_adaptivecpp' option")
+          set(experimental_builtin_adaptivecpp ON CACHE BOOL "Enabled because external AdaptiveCpp not found" FORCE)
         endif()
       endif()
     endif()