OpenMP requires: Fix diagnostic filename corner case

The issue occurs when there is, e.g., main._omp_fn.0 in two files with
different OpenMP requires clauses.  The function entries in the offload
table ends up having the same decl tree and, hence, the diagnostic showed
the same filename for both.  Solution: Use the .o filename in this case.

Note that the issue does not occur with same-named 'static' functions and
without the fatal error from the requires diagnostic, there would be
later a linker error due to having two 'main'.

gcc/
	* lto-cgraph.cc (input_offload_tables): Improve requires diagnostic
	when filenames come out identically.

diff --git a/gcc/lto-cgraph.cc b/gcc/lto-cgraph.cc
index 6d9c36ea8b67f60ac66d0e2bf50b7f58d8a53732..39af9c1bd072c444f09778b647b8c5e82b498b17 100644 (file)
--- a/gcc/lto-cgraph.cc
+++ b/gcc/lto-cgraph.cc
@@ -1881,6 +1881,11 @@ input_offload_tables (bool do_force_output)
                      if (tmp_decl != NULL_TREE)
                        fn2 = IDENTIFIER_POINTER (DECL_NAME (tmp_decl));
                    }
+                 if (fn1 == fn2)
+                   {
+                     fn1 = requires_fn;
+                     fn2 = file_data->file_name;
+                   }
 
                  char buf1[sizeof ("unified_address, unified_shared_memory, "
                                    "reverse_offload")];