[gdb/testsuite] Compile infcall-nested-structs.exp with -O2

As mentioned in commit 745ff14e6e1 "[gdb/tdep] Fix 'Unexpected register class'
assert in amd64_push_arguments", of the 12 KFAILs added there, 3 are KPASSing
with g++ 4.8.5.

The KPASSes are due to:
- gdb incorrectly expecting the second half of the result of function
  rtn_str_struct_02_01 in register %rdx.
- rtn_str_struct_02_01 using %rdx as a temporary, thereby accidentally setting
  it to the expected value.

Reduce the chance of hiding errors due accidental register settings by
compiling the test-case with -O2.

This fixes the KPASSes when applied on top of commit 745ff14e6e1.

Tested on x86_64-linux.

Tested with g++ 4.8.5, 7.4.1, 8.3.1, 9.2.1.

gdb/testsuite/ChangeLog:

2019-10-21  Tom de Vries  <tdevries@suse.de>

	* gdb.base/infcall-nested-structs.c: Add
	__attribute__((noinline,noclone)) to all functions.
	(call_all): Add missing variable initialization.  Simplify return value.
	(breakpt): Increment volatile variable, to prevent call from being
	optimized out.
	* gdb.base/infcall-nested-structs.exp: Compile with -O2.

Change-Id: Ic027e1c957fecd6686345639db99f5eaee3cdf05

3 files changed, 63 insertions, 35 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 1075a1d..9f826a6 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,12 @@
+2019-10-21  Tom de Vries  <tdevries@suse.de>
+
+	* gdb.base/infcall-nested-structs.c: Add
+	__attribute__((noinline,noclone)) to all functions.
+	(call_all): Add missing variable initialization.  Simplify return value.
+	(breakpt): Increment volatile variable, to prevent call from being
+	optimized out.
+	* gdb.base/infcall-nested-structs.exp: Compile with -O2.
+
 2019-10-17  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.fortran/module.exp: Allow info variables to print info for files
diff --git a/gdb/testsuite/gdb.base/infcall-nested-structs.c b/gdb/testsuite/gdb.base/infcall-nested-structs.c
index 795ab4a..f2a4294 100644
--- a/gdb/testsuite/gdb.base/infcall-nested-structs.c
+++ b/gdb/testsuite/gdb.base/infcall-nested-structs.c
@@ -51,13 +51,13 @@ typedef long double _Complex tldc;
 #endif /* TEST_COMPLEX */
 
 #define MAKE_CHECK_FUNCS(TYPE)					\
-  int								\
+  int __attribute__((noinline,noclone))				\
   check_arg_ ## TYPE (struct TYPE arg)				\
   {								\
     return cmp_ ## TYPE (arg, ref_val_ ## TYPE);		\
   }								\
 								\
-  struct TYPE							\
+  struct TYPE __attribute__((noinline,noclone))			\
   rtn_str_ ## TYPE (void)					\
   {								\
     return (ref_val_ ## TYPE);					\
@@ -128,125 +128,141 @@ struct struct_static_06_04 { ES(es1); ES(es2); static tA a; ES(es3); static tB b
 
 #endif
 
-int cmp_struct_01_01 (struct struct_01_01 a, struct struct_01_01 b)
+int __attribute__((noinline,noclone))
+cmp_struct_01_01 (struct struct_01_01 a, struct struct_01_01 b)
 { return a.s2.s1.a == b.s2.s1.a; }
 
-int cmp_struct_01_02 (struct struct_01_02 a, struct struct_01_02 b)
+int __attribute__((noinline,noclone))
+cmp_struct_01_02 (struct struct_01_02 a, struct struct_01_02 b)
 { return a.a == b.a; }
 
-int cmp_struct_01_03 (struct struct_01_03 a, struct struct_01_03 b)
+int __attribute__((noinline,noclone))
+cmp_struct_01_03 (struct struct_01_03 a, struct struct_01_03 b)
 { return a.s4.s3.a == b.s4.s3.a; }
 
-int cmp_struct_01_04 (struct struct_01_04 a, struct struct_01_04 b)
+int __attribute__((noinline,noclone))
+cmp_struct_01_04 (struct struct_01_04 a, struct struct_01_04 b)
 { return a.a == b.a; }
 
-int cmp_struct_02_01 (struct struct_02_01 a, struct struct_02_01 b)
+int __attribute__((noinline,noclone))
+cmp_struct_02_01 (struct struct_02_01 a, struct struct_02_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b; }
 
-int cmp_struct_02_02 (struct struct_02_02 a, struct struct_02_02 b)
+int __attribute__((noinline,noclone))
+cmp_struct_02_02 (struct struct_02_02 a, struct struct_02_02 b)
 { return a.a == b.a && a.b == b.b; }
 
-int cmp_struct_02_03 (struct struct_02_03 a, struct struct_02_03 b)
+int __attribute__((noinline,noclone))
+cmp_struct_02_03 (struct struct_02_03 a, struct struct_02_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b; }
 
-int cmp_struct_02_04 (struct struct_02_04 a, struct struct_02_04 b)
+int __attribute__((noinline,noclone))
+cmp_struct_02_04 (struct struct_02_04 a, struct struct_02_04 b)
 { return a.a == b.a && a.b == b.b; }
 
-int cmp_struct_04_01 (struct struct_04_01 a, struct struct_04_01 b)
+int __attribute__((noinline,noclone))
+cmp_struct_04_01 (struct struct_04_01 a, struct struct_04_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b
 	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == b.s2.s1.d; }
 
-int cmp_struct_04_02 (struct struct_04_02 a, struct struct_04_02 b)
+int __attribute__((noinline,noclone))
+cmp_struct_04_02 (struct struct_04_02 a, struct struct_04_02 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
 
-int cmp_struct_04_03 (struct struct_04_03 a, struct struct_04_03 b)
+int __attribute__((noinline,noclone))
+cmp_struct_04_03 (struct struct_04_03 a, struct struct_04_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
 	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d; }
 
-int cmp_struct_04_04 (struct struct_04_04 a, struct struct_04_04 b)
+int __attribute__((noinline,noclone))
+cmp_struct_04_04 (struct struct_04_04 a, struct struct_04_04 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
 
-int cmp_struct_05_01 (struct struct_05_01 a, struct struct_05_01 b)
+int __attribute__((noinline,noclone))
+cmp_struct_05_01 (struct struct_05_01 a, struct struct_05_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b
 	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == b.s2.s1.d
 	 && a.s2.s1.e == b.s2.s1.e; }
 
-int cmp_struct_05_02 (struct struct_05_02 a, struct struct_05_02 b)
+int __attribute__((noinline,noclone))
+cmp_struct_05_02 (struct struct_05_02 a, struct struct_05_02 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e; }
 
-int cmp_struct_05_03 (struct struct_05_03 a, struct struct_05_03 b)
+int __attribute__((noinline,noclone))
+cmp_struct_05_03 (struct struct_05_03 a, struct struct_05_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
 	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d
 	 && a.s12.s11.e == b.s12.s11.e; }
 
-int cmp_struct_05_04 (struct struct_05_04 a, struct struct_05_04 b)
+int __attribute__((noinline,noclone))
+cmp_struct_05_04 (struct struct_05_04 a, struct struct_05_04 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e; }
 
 #ifdef __cplusplus
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_02_01 (struct struct_static_02_01 a,
 			 struct struct_static_02_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_02_02 (struct struct_static_02_02 a,
 			 struct struct_static_02_02 b)
 { return a.a == b.a && a.b == b.b; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_02_03 (struct struct_static_02_03 a,
 			 struct struct_static_02_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_02_04 (struct struct_static_02_04 a,
 			     struct struct_static_02_04 b)
 { return a.a == b.a && a.b == b.b; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_04_01 (struct struct_static_04_01 a,
 			 struct struct_static_04_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b
 	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == b.s2.s1.d; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_04_02 (struct struct_static_04_02 a,
 			 struct struct_static_04_02 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_04_03 (struct struct_static_04_03 a,
 			 struct struct_static_04_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
 	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_04_04 (struct struct_static_04_04 a,
 			 struct struct_static_04_04 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_06_01 (struct struct_static_06_01 a,
 			 struct struct_static_06_01 b)
 { return a.s2.s1.a == b.s2.s1.a && a.s2.s1.b == b.s2.s1.b
 	 && a.s2.s1.c == b.s2.s1.c && a.s2.s1.d == b.s2.s1.d
 	 && a.s2.s1.e == b.s2.s1.e && a.f == b.f; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_06_02 (struct struct_static_06_02 a,
 			 struct struct_static_06_02 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e
 	 && a.f == b.f; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_06_03 (struct struct_static_06_03 a,
 			 struct struct_static_06_03 b)
 { return a.s4.s3.a == b.s4.s3.a && a.s6.s5.b == b.s6.s5.b
 	 && a.s8.s7.c == b.s8.s7.c && a.s10.s9.d == b.s10.s9.d
 	 && a.s12.s11.e == b.s12.s11.e && a.s12.s11.f == b.s12.s11.f; }
 
-int
+int __attribute__((noinline,noclone))
 cmp_struct_static_06_04 (struct struct_static_06_04 a,
 			 struct struct_static_06_04 b)
 { return a.a == b.a && a.b == b.b && a.c == b.c && a.d == b.d && a.e == b.e
@@ -350,10 +366,10 @@ MAKE_CHECK_FUNCS(struct_static_06_04)
 
 #define CALL_LINE(NAME) val += check_arg_ ## NAME (rtn_str_ ## NAME ())
 
-int
+int __attribute__((noinline,noclone))
 call_all ()
 {
-  int val;
+  int val = 0;
 
   CALL_LINE(struct_01_01);
   CALL_LINE(struct_01_02);
@@ -386,13 +402,15 @@ call_all ()
   CALL_LINE(struct_static_06_04);
 #endif
 
-  return (val != 4);
+  return val;
 }
 
-void
+int volatile v = 1;
+
+void __attribute__((noinline, noclone))
 breakpt (void)
 {
-  /* Nothing.  */
+  v++;
 }
 
 int
diff --git a/gdb/testsuite/gdb.base/infcall-nested-structs.exp b/gdb/testsuite/gdb.base/infcall-nested-structs.exp
index 982149f..e3045d9 100644
--- a/gdb/testsuite/gdb.base/infcall-nested-structs.exp
+++ b/gdb/testsuite/gdb.base/infcall-nested-structs.exp
@@ -73,6 +73,7 @@ proc start_nested_structs_test { lang types } {
     # Create the additional flags
     set flags $compile_flags
     lappend flags $lang
+    lappend flags "additional_flags=-O2"
 
     for {set n 0} {$n<[llength ${types}]} {incr n} {
 	set m [I2A ${n}]