ld:

* ldlang.c (entry_symbol_default): New file-scope global.
	(lang_finish): Use it, not a hardwired "start".
	(lang_default_entry): Set it.
	* ldlang.h: Declare lang_default_entry.
	* emultempl/beos.em, emultempl/pe.em: Use lang_default_entry,
	not lang_add_entry, to override default entry point symbol.

ld/testsuite:
	* ld-scripts/align.exp: Mark align1 XFAIL on PECOFF targets.
	* ld-scripts/data.exp: Mark data UNSUPPORTED on a.out targets.
	* ld-scripts/provide.exp, ld-scripts/size.exp: Mark all tests
	UNSUPPORTED on a.out targets.  Tidy.

ld/ldlang.c

@@ -91,6 +91,7 @@ lang_statement_list_type lang_output_section_statement;
 lang_statement_list_type *stat_ptr = &statement_list;
 lang_statement_list_type file_chain = { NULL, NULL };
 struct bfd_sym_chain entry_symbol = { NULL, NULL };
+static const char *entry_symbol_default = "start";
 const char *entry_section = ".text";
 bfd_boolean entry_from_cmdline;
 bfd_boolean lang_has_input_file = FALSE;
@@ -4743,9 +4744,9 @@ lang_finish (void)
 
   if (entry_symbol.name == NULL)
     {
-      /* No entry has been specified.  Look for start, but don't warn
-	 if we don't find it.  */
-      entry_symbol.name = "start";
+      /* No entry has been specified.  Look for the default entry, but
+	 don't warn if we don't find it.  */
+      entry_symbol.name = entry_symbol_default;
       warn = FALSE;
     }
 
@@ -5582,6 +5583,16 @@ lang_add_entry (const char *name, bfd_boolean cmdline)
     }
 }
 
+/* Set the default start symbol to NAME.  .em files should use this,
+   not lang_add_entry, to override the use of "start" if neither the
+   linker script nor the command line specifies an entry point.  NAME
+   must be permanently allocated.  */
+void
+lang_default_entry (const char *name)
+{
+  entry_symbol_default = name;
+}
+
 void
 lang_add_target (const char *name)
 {