invoke.texi (Debugging Options): Document change of debugging dump location.

2009-05-07  Mark Heffernan  <meheff@google.com>

	* doc/invoke.texi (Debugging Options): Document change of debugging
	dump location.
        * opts.c (decode_options): Make dump_base_name relative to
	aux_base_name directory.

From-SVN: r147249

1 files changed, 21 insertions, 0 deletions

diff --git a/gcc/opts.c b/gcc/opts.c
index 1170967..aab540c 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -961,6 +961,27 @@ decode_options (unsigned int argc, const char **argv)
 
   handle_options (argc, argv, lang_mask);
 
+  /* Make DUMP_BASE_NAME relative to the AUX_BASE_NAME directory,
+     typically the directory to contain the object file.  */
+  if (aux_base_name && ! IS_ABSOLUTE_PATH (dump_base_name))
+    {
+      const char *aux_base;
+
+      base_of_path (aux_base_name, &aux_base);
+      if (aux_base_name != aux_base)
+	{
+	  int dir_len = aux_base - aux_base_name;
+	  char *new_dump_base_name =
+	    XNEWVEC (char, strlen(dump_base_name) + dir_len + 1);
+
+	  /* Copy directory component from AUX_BASE_NAME.  */
+	  memcpy (new_dump_base_name, aux_base_name, dir_len);
+	  /* Append existing DUMP_BASE_NAME.  */
+	  strcpy (new_dump_base_name + dir_len, dump_base_name);
+	  dump_base_name = new_dump_base_name;
+	}
+    }
+
   /* Handle related options for unit-at-a-time, toplevel-reorder, and
      section-anchors.  */
   if (!flag_unit_at_a_time)