Update copyright dates.

[deliverable/binutils-gdb.git] / ld / ldemul.c

diff --git a/ld/ldemul.c b/ld/ldemul.c
index b29703627f51b22bdad5fbf21d9498d060db76d5..c6ba73003d590b9810db306e8b07f0566e66dc7c 100644 (file)
--- a/ld/ldemul.c
+++ b/ld/ldemul.c
@@ -1,6 +1,6 @@
 /* ldemul.c -- clearing house for ld emulation states
    Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-   2001, 2002, 2003, 2005, 2007, 2008, 2009
+   2001, 2002, 2003, 2005, 2007, 2008, 2009, 2010, 2011
    Free Software Foundation, Inc.
 
    This file is part of the GNU Binutils.
@@ -192,9 +192,35 @@ ldemul_default_target (int argc ATTRIBUTE_UNUSED, char **argv ATTRIBUTE_UNUSED)
   return ld_emulation->target_name;
 }
 
+/* If the entry point was not specified as an address, then add the
+   symbol as undefined.  This will cause ld to extract an archive
+   element defining the entry if ld is linking against such an archive.
+
+   We don't do this when generating shared libraries unless given -e
+   on the command line, because most shared libs are not designed to
+   be run as an executable.  However, some are, eg. glibc ld.so and
+   may rely on the default linker script supplying ENTRY.  So we can't
+   remove the ENTRY from the script, but would rather not insert
+   undefined _start syms.  */
+
 void
 after_parse_default (void)
 {
+  if (entry_symbol.name != NULL
+      && (link_info.executable || entry_from_cmdline))
+    {
+      bfd_boolean is_vma = FALSE;
+
+      if (entry_from_cmdline)
+       {
+         const char *send;
+
+         bfd_scan_vma (entry_symbol.name, &send, 0);
+         is_vma = *send == '\0';
+       }
+      if (!is_vma)
+       ldlang_add_undef (entry_symbol.name, entry_from_cmdline);
+    }
 }
 
 void