[lto][patch] Add a -nop option to the linker plugin

[Rafael Espindola <espindola at google dot com>]

This patch adds a -nop option to the plugin. With this option the
plugin just uses the original files, instead of running wpa. This is
useful for trying to find if a problem is on wpa or in the plugin
itself.

2008-12-08  Rafael Avila de Espindola  <espindola@google.com>

	* lto-plugin.c (nop): New.
	(use_original_files): New.
	(all_symbols_read_handler): Call use_original_files if nop is true.
	(process_option): Parse the -nop option.

Cheers,
-- 
Rafael Avila de Espindola

Google | Gordon House | Barrow Street | Dublin 4 | Ireland
Registered in Dublin, Ireland | Registration Number: 368047

diff --git a/lto-plugin/lto-plugin.c b/lto-plugin/lto-plugin.c
index 16171a0..1b6d211 100644
--- a/lto-plugin/lto-plugin.c
+++ b/lto-plugin/lto-plugin.c
@@ -94,6 +94,7 @@ static char **lto_wrapper_argv;
 static int lto_wrapper_num_args;
 
 static int debug;
+static int nop;
 
 /* Parse an entry of the IL symbol table. The data to be parsed is pointed
    by P and the result is written in ENTRY. The slot number is stored in SLOT.
@@ -396,6 +397,17 @@ exec_lto_wrapper (char *const argv[])
     }
 }
 
+static void
+use_original_files (void)
+{
+  unsigned i;
+  for (i = 0; i < num_claimed_files; i++)
+    {
+      struct plugin_file_info *info = &claimed_files[i];
+      add_input_file (info->name);
+    }
+}
+
 
 /* Called by the linker once all symbols have been read. */
 
@@ -409,12 +421,18 @@ all_symbols_read_handler (void)
   if (num_claimed_files == 0)
     return LDPS_OK;
 
+  free_1 ();
+
+  if (nop)
+    {
+      use_original_files ();
+      return LDPS_OK;
+    }
+
   lto_argv = (char **) calloc (sizeof (char *), num_lto_args);
   lto_arg_ptr = (const char **) lto_argv;
   assert (lto_wrapper_argv);
 
-  free_1 ();
-
   write_resolution ();
 
   for (i = 0; i < lto_wrapper_num_args; i++)
@@ -558,6 +576,8 @@ process_option (const char *option)
 {
   if (strcmp (option, "-debug") == 0)
     debug = 1;
+  else if (strcmp (option, "-nop") == 0)
+    nop = 1;
   else
     {
       int size;