problem with -fprofile-arcs and -O3

[Herman ten Brugge <Haj dot Ten dot Brugge at net dot HCC dot nl>]

Hello,

I detected a small problem when compiling programs with -fprofile-arcs and
-O3. When this is done the constructor function is sometimes not generated
for small programs.
The following code demonstrates the problem:

int main() { return 0; }

When compiled with '-fprofile-arcs -O3' the constructor function
'_GLOBAL_.I.mainGCOV' is missing. When compiled with -O2 instead of -O3
the '_GLOBAL_.I.mainGCOV' is present again. I corrected this problem in
toplev.c. The problem was that code generation is delayed when -O3 is used.

	Herman.

1998-10-13 Herman A.J. ten Brugge <Haj.Ten.Brugge@net.HCC.nl>

        * toplev.c (compile_file): Output constructor for small programs
	when compiling with -O3 and -fprofile-arcs.


--- toplev.c.org	Tue Oct 13 20:35:05 1998
+++ toplev.c	Tue Oct 13 20:35:11 1998
@@ -2796,7 +2796,6 @@ compile_file (name)
 	poplevel (0, 0, 0);
     }
 
-  output_func_start_profiler ();
 
   /* Compilation is now finished except for writing
      what's left of the symbol table output.  */
@@ -2996,6 +2995,49 @@ compile_file (name)
 #endif
       }
   }
+
+  /* Write start profiler code if enabled. */
+
+  if (profile_arc_flag || flag_test_coverage || flag_branch_probabilities)
+    {
+      int len;
+      int i;
+      tree decl;
+
+      output_func_start_profiler();
+      len = list_length (globals);
+
+      for (i = 0, decl = getdecls (); i < len; i++, decl = TREE_CHAIN (decl))
+        {
+	  DECL_DEFER_OUTPUT (decl) = 0;
+	  if (TREE_CODE (decl) == VAR_DECL && DECL_SIZE (decl) == 0
+	      && incomplete_decl_finalize_hook != 0)
+	    (*incomplete_decl_finalize_hook) (decl);
+	  if (TREE_ASM_WRITTEN (decl) || DECL_EXTERNAL (decl))
+	    continue;
+	
+	  if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl)
+	      && (! TREE_READONLY (decl)
+		  || TREE_PUBLIC (decl)
+		  || (!optimize && flag_keep_static_consts)
+		  || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
+	    {
+	      rest_of_decl_compilation (decl, NULL_PTR, 1, 1);
+	    }
+
+	  if (TREE_CODE (decl) == FUNCTION_DECL
+	      && DECL_INITIAL (decl) != 0
+	      && DECL_SAVED_INSNS (decl) != 0
+	      && (flag_keep_inline_functions
+		  || TREE_PUBLIC (decl)
+		  || TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
+	    {
+	      temporary_allocation ();
+	      output_inline_function (decl);
+	      permanent_allocation (1);
+	    }
+        }
+    }
 
   /* Write out any pending weak symbol declarations.  */
 

-- 
-------------------------------------------------------------------------
Herman ten Brugge			Email:	Haj.Ten.Brugge@net.HCC.nl