Fix fail in mi-var-child.exp and mi-var-display.exp

Hi,
I see the following fails on arm-none-eabi target,

-var-list-children --simple-values struct_declarations  ^M
^done,numchild="11",children=[...,child={name="struct_declarations.func_ptr_struct",exp="func_ptr_struct",numchild="0",value="0x0 <_ftext>",type="struct _struct_decl (*)(int, char *, long)",thread-id="1"},child={name="struct_declarations.func_ptr_ptr",exp="func_ptr_ptr",numchild="0",value="0x0 <_ftext>",type="struct _struct_decl *(*)(int, char *, long)",thread-id="1"},...
(gdb) ^M
FAIL: gdb.mi/mi-var-child.exp: listing of children, simple types: names, type and values, complex types: names and types

-var-set-format weird.func_ptr_ptr natural^M
^done,format="natural",value="0x0 <_ftext>"^M
(gdb) ^M
FAIL: gdb.mi/mi-var-display.exp: set format variable weird.func_ptr_ptr in natural

In the test, "0x0" is expected, but "0x0 <_ftext>" is in the output.
Function pointers point to address zero, and tests assume there is no
symbol on address zero.  However, on my arm-none-eabi target, there is
a code symbol _ftext on address zero, and test fails.  Note that "set
print symbol off" doesn't take effect for function pointer.

int (*f) (void);
f = main;

(gdb) p f
$1 = (int (*)(void)) 0x8048400 <main>
(gdb) set print symbol off
(gdb) p f
$2 = (int (*)(void)) 0x8048400 <main>

In order to erase the difference, we can assign some function address
explicitly to function pointer, so the test behaves in a unique way.
In this patch, we assign nothing1 and nothing2 to function pointers
func_ptr_struct and func_ptr_ptr respectively, and update test as the
source file is changed.

gdb/testsuite:

2014-10-14  Yao Qi  <yao@codesourcery.com>

	* gdb.mi/mi-var-child.c (nothing1): New function.
	(nothing2): New function.
	(do_children_tests): Set function pointers by nothing1 and
	nothing2.
	* gdb.mi/mi-var-child.exp: Step over new added statements.
	Update test to match the new output.
	* gdb.mi/var-cmd.c (nothing1): New function.
	(nothing2): New function.
	(do_children_tests): Set function pointers by  nothing1 and
	nothing2.
	* gdb.mi/mi-var-display.exp: Update test to match output.
	Step to the line specified by $line_dct_nothing.
	Increase the number of lines to step.

1 files changed, 16 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.mi/mi-var-child.c b/gdb/testsuite/gdb.mi/mi-var-child.c
index bde668edc87..689fe553789 100644
--- a/gdb/testsuite/gdb.mi/mi-var-child.c
+++ b/gdb/testsuite/gdb.mi/mi-var-child.c
@@ -160,6 +160,20 @@ nothing ()
 {
 }
 
+struct _struct_decl
+nothing1 (int a, char *b, long c)
+{
+  struct _struct_decl foo;
+
+  return foo;
+}
+
+struct _struct_decl *
+nothing2 (int a, char *b, long c)
+{
+  return (struct _struct_decl *) 0;
+}
+
 void
 subroutine1 (int i, long *l)
 {
@@ -231,6 +245,8 @@ do_children_tests (void)
   struct_declarations.long_array[9] = 1234;
 
   weird->func_ptr = nothing;
+  weird->func_ptr_struct = nothing1;
+  weird->func_ptr_ptr = nothing2;
   struct_declarations.long_array[10] = 3456;
   struct_declarations.long_array[11] = 5678;