[patch][commit] Fix gdb.cp/cpcompletion.exp failure with GCC-4.4.0

[patch][commit] Fix gdb.cp/cpcompletion.exp failure with GCC-4.4.0

[Paul Pluzhnikov]

Greetings,

gdb.cp/cpcompletion.exp fails under GCC-4.4.0, because compiler
optimizes out the 'a' variable:

 <1><50d>: Abbrev Number: 32 (DW_TAG_subprogram)
  <50e>     DW_AT_external    : 1       
  <50f>     DW_AT_name        : (indirect string, offset: 0xcd): main   
  <513>     DW_AT_decl_file   : 1       
  <514>     DW_AT_decl_line   : 42      
  <515>     DW_AT_type        : <33c>   
  <519>     DW_AT_low_pc      : 0x400370        
  <521>     DW_AT_high_pc     : 0x4003b0        
  <529>     DW_AT_frame_base  : 0xfc    (location list)
  <52d>     DW_AT_sibling     : <569>   
 <2><531>: Abbrev Number: 33 (DW_TAG_structure_type)
  <532>     DW_AT_name        : (indirect string, offset: 0x246): <anonymous struct>    
  <536>     DW_AT_byte_size   : 1       
  <537>     DW_AT_decl_file   : 1       
  <538>     DW_AT_decl_line   : 45      
  <539>     DW_AT_sibling     : <551>   
 <3><53d>: Abbrev Number: 34 (DW_TAG_subprogram)
  <53e>     DW_AT_name        : get     
  <542>     DW_AT_decl_file   : 1       
  <543>     DW_AT_decl_line   : 46      
  <544>     DW_AT_type        : <33c>   
  <548>     DW_AT_declaration : 1       
 <4><549>: Abbrev Number: 6 (DW_TAG_formal_parameter)
  <54a>     DW_AT_type        : <569>   
  <54e>     DW_AT_artificial  : 1       
 <2><551>: Abbrev Number: 35 (DW_TAG_variable)
  <552>     DW_AT_name        : a       
  <554>     DW_AT_decl_file   : 1       
  <555>     DW_AT_decl_line   : 47      
  <556>     DW_AT_type        : <531>   
                                       <<<< Missing DW_AT_location
 <2><55a>: Abbrev Number: 36 (DW_TAG_variable)
  <55b>     DW_AT_name        : (indirect string, offset: 0xb7): foo1   

Committed as obvious.
--
Paul Pluzhnikov

testsuite/ChangeLog:

2009-02-06  Paul Pluzhnikov  <ppluzhnikov@google.com>

	    * gdb.cp/pr9594.cc: Prevent GCC from optimizing 'a' out.


Index: gdb.cp/pr9594.cc
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.cp/pr9594.cc,v
retrieving revision 1.1
diff -u -p -u -r1.1 pr9594.cc
--- gdb.cp/pr9594.cc	3 Feb 2009 01:09:01 -0000	1.1
+++ gdb.cp/pr9594.cc	10 Feb 2009 00:56:59 -0000
@@ -47,5 +47,6 @@ int main ()
   } a;
   Foo foo1;
   foo1.set_foo (42);		// Set breakpoint here.
+  a.get();			// Prevent compiler from throwing 'a' away.
   return 0;
 }