[PATCH] Fix init_reload memory leak

[Jakub Jelinek]

Hi!

While working on the multiversioning patch I've just posted,
I've noticed that on say:
void foo ();
void foo () __attribute__((target ("avx")));
void foo () __attribute__((target ("default")));
__attribute__((target ("default"))) void foo ()
{
}
__attribute__((target ("avx"))) void foo ()
{
}
void (*fn) () = foo;
we leak memory, because init_reload is called several times (due to target
attribute) and it never destroys reload_obstack already created before
initializing a new one.  Fixed by initializing it just once.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2013-01-21  Jakub Jelinek  <ja...@redhat.com>

        * reload1.c (init_reload): Only initialize reload_obstack
        during the first call.

--- gcc/reload1.c.jj    2013-01-11 09:03:17.000000000 +0100
+++ gcc/reload1.c       2013-01-21 12:47:01.091040655 +0100
@@ -468,8 +468,11 @@ init_reload (void)
     }
 
   /* Initialize obstack for our rtl allocation.  */
-  gcc_obstack_init (&reload_obstack);
-  reload_startobj = XOBNEWVAR (&reload_obstack, char, 0);
+  if (reload_startobj == NULL)
+    {
+      gcc_obstack_init (&reload_obstack);
+      reload_startobj = XOBNEWVAR (&reload_obstack, char, 0);
+    }
 
   INIT_REG_SET (&spilled_pseudos);
   INIT_REG_SET (&changed_allocation_pseudos);

        Jakub