Remove the deprecated Oracle interface

The Oracle interface was deprecated in ROOT 6.30 and scheduled for
removal in 6.32. As we are now in the 6.32 development cycle, everything
related to `oracle` can be removed.

Author: guitargeek

cmake/modules/FindOracle.cmake

@@ -147,7 +147,6 @@ ROOT_BUILD_OPTION(mpi OFF "Enable support for Message Passing Interface (MPI)")
 ROOT_BUILD_OPTION(mysql ON "Enable support for MySQL databases")
 ROOT_BUILD_OPTION(odbc OFF "Enable support for ODBC databases (requires libiodbc or libodbc)")
 ROOT_BUILD_OPTION(opengl ON "Enable support for OpenGL (requires libGL and libGLU)")
-ROOT_BUILD_OPTION(oracle OFF "Enable support for Oracle databases (requires Oracle Instant Client) (deprecated)")
 ROOT_BUILD_OPTION(pgsql ON "Enable support for PostgreSQL")
 ROOT_BUILD_OPTION(proof OFF "Enable support for PROOF")
 ROOT_BUILD_OPTION(pyroot ON "Enable support for automatic Python bindings (PyROOT)")
@@ -241,7 +240,6 @@ if(all)
  set(mysql_defvalue ON)
  set(odbc_defvalue ON)
  set(opengl_defvalue ON)
- set(oracle_defvalue ON)
  set(pgsql_defvalue ON)
  set(proof_defvalue OFF)
  set(pythia6_defvalue ON)
@@ -404,17 +402,17 @@ if(NOT webgui)
 endif()
 
 #---Removed options------------------------------------------------------------
-foreach(opt afdsmgrd afs alien bonjour castor chirp cxx11 cxx14 cxx17 geocad
-        gfal glite globus gsl_shared hdfs ios jemalloc krb5 ldap memstat
-        monalisa pyroot_legacy qt qtgsi rfio ruby sapdb srp table tcmalloc
-        python vmc xproofd pyroot-python2 exceptions)
+foreach(opt afdsmgrd afs alien bonjour castor chirp cxx11 cxx14 cxx17
+        exceptions geocad gfal glite globus gsl_shared hdfs ios jemalloc krb5
+        ldap memstat monalisa oracle pyroot-python2 pyroot_legacy python qt
+        qtgsi rfio ruby sapdb srp table tcmalloc vmc xproofd)
   if(${opt})
     message(FATAL_ERROR ">>> Option '${opt}' is no longer supported in ROOT ${ROOT_VERSION}.")
   endif()
 endforeach()
 
 #---Deprecated options------------------------------------------------------------------------
-foreach(opt cxxmodules oracle pythia6 pythia6_nolink)
+foreach(opt cxxmodules pythia6 pythia6_nolink)
   if(${opt})
     message(DEPRECATION ">>> Option '${opt}' is deprecated and will be removed in the next release of ROOT. Please contact [email protected] should you still need it.")
   endif()

cmake/modules/RootBuildOptions.cmake

@@ -726,20 +726,6 @@ if(fcgi)
 endif()
 
 
-#---Check for Oracle-------------------------------------------------------------------
-if(oracle)
-  message(STATUS "Looking for Oracle")
-  find_package(Oracle)
-  if(NOT ORACLE_FOUND)
-    if(fail-on-missing)
-      message(FATAL_ERROR "Oracle libraries not found and they are required (orable option enabled)")
-    else()
-      message(STATUS "Oracle not found. Switching off oracle option")
-      set(oracle OFF CACHE BOOL "Disabled because Oracle not found (${oracle_description})" FORCE)
-    endif()
-  endif()
-endif()
-
 #---Check for ODBC-------------------------------------------------------------------
 if(odbc)
   message(STATUS "Looking for ODBC")

cmake/modules/SearchInstalledSoftware.cmake

@@ -7,9 +7,6 @@
 if(mysql)
   add_subdirectory(mysql)
 endif()
-if(oracle)
-  add_subdirectory(oracle)
-endif()
 if(odbc)
   add_subdirectory(odbc)
 endif()