Fix testcases using __attribute__((noclone)) with Clang

Clang fails to compile a number of files with the following warning:
unknown attribute 'noclone' ignored [-Wunknown-attributes].  This
commit adds a new header, lib/noclone.h, which defines the macro
ATTRIBUTE_NOCLONE accordingly, and updates the relevant testcases
to use it.

gdb/testsuite/ChangeLog:

	* lib/attributes.h: New header.
	* gdb.base/backtrace.c: Include the above. Replace
	__attribute__(noclone)) with ATTRIBUTE_NOCLONE.
	* gdb.base/infcall-nested-structs.c: Likewise.
	* gdb.base/vla-optimized-out.c: Likewise.

5 files changed, 89 insertions, 36 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 123d3454..be14e5a 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,11 @@
+2020-11-02  Gary Benson <gbenson@redhat.com>
+
+	* lib/attributes.h: New header.
+	* gdb.base/backtrace.c: Include the above. Replace
+	__attribute__(noclone)) with ATTRIBUTE_NOCLONE.
+	* gdb.base/infcall-nested-structs.c: Likewise.
+	* gdb.base/vla-optimized-out.c: Likewise.
+
 2020-11-02  Tom de Vries  <tdevries@suse.de>
 
 	* gdb.dwarf2/fission-multi-cu.S: Remove .debug_line.dwo section.
diff --git a/gdb/testsuite/gdb.base/backtrace.c b/gdb/testsuite/gdb.base/backtrace.c
index bae8b1a..ce63e33 100644
--- a/gdb/testsuite/gdb.base/backtrace.c
+++ b/gdb/testsuite/gdb.base/backtrace.c
@@ -15,19 +15,21 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-int __attribute__((noinline,noclone))
+#include "../lib/attributes.h"
+
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 baz ()
 {
   return 0;	/* Break here.  */
 }
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 bar ()
 {
   return baz ();
 }
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 foo ()
 {
   return bar ();
diff --git a/gdb/testsuite/gdb.base/infcall-nested-structs.c b/gdb/testsuite/gdb.base/infcall-nested-structs.c
index c0c8e19..ee347d4 100644
--- a/gdb/testsuite/gdb.base/infcall-nested-structs.c
+++ b/gdb/testsuite/gdb.base/infcall-nested-structs.c
@@ -33,6 +33,7 @@
    in the structs.exp test script.  */
 
 #include <string.h>
+#include "../lib/attributes.h"
 
 /* Useful abreviations.  */
 typedef char tc;
@@ -51,13 +52,13 @@ typedef long double _Complex tldc;
 #endif /* TEST_COMPLEX */
 
 #define MAKE_CHECK_FUNCS(TYPE)					\
-  int __attribute__((noinline,noclone))				\
+  int __attribute__((noinline)) ATTRIBUTE_NOCLONE		\
   check_arg_ ## TYPE (struct TYPE arg)				\
   {								\
     return cmp_ ## TYPE (arg, ref_val_ ## TYPE);		\
   }								\
 								\
-  struct TYPE __attribute__((noinline,noclone))			\
+  struct TYPE __attribute__((noinline)) ATTRIBUTE_NOCLONE	\
   rtn_str_ ## TYPE (void)					\
   {								\
     return (ref_val_ ## TYPE);					\
@@ -128,141 +129,141 @@ struct struct_static_06_04 { ES(es1); ES(es2); static tA a; ES(es3); static tB b
 
 #endif
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 cmp_struct_01_02 (struct struct_01_02 a, struct struct_01_02 b)
 { return a.a == b.a; }
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 cmp_struct_01_04 (struct struct_01_04 a, struct struct_01_04 b)
 { return a.a == b.a; }
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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 __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_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
@@ -366,7 +367,7 @@ MAKE_CHECK_FUNCS(struct_static_06_04)
 
 #define CALL_LINE(NAME) val += check_arg_ ## NAME (rtn_str_ ## NAME ())
 
-int __attribute__((noinline,noclone))
+int __attribute__((noinline)) ATTRIBUTE_NOCLONE
 call_all ()
 {
   int val = 0;
@@ -407,7 +408,7 @@ call_all ()
 
 int volatile v = 1;
 
-void __attribute__((noinline, noclone))
+void __attribute__((noinline)) ATTRIBUTE_NOCLONE
 breakpt (void)
 {
   v++;
diff --git a/gdb/testsuite/gdb.base/vla-optimized-out.c b/gdb/testsuite/gdb.base/vla-optimized-out.c
index edc2b5e..d21df7a 100644
--- a/gdb/testsuite/gdb.base/vla-optimized-out.c
+++ b/gdb/testsuite/gdb.base/vla-optimized-out.c
@@ -18,9 +18,11 @@
 /* The version of this test-case with f1 tagged with noinline only is equivalent
    to gcc/testsuite/gcc.dg/guality/vla-1.c.  */
 
+#include "../lib/attributes.h"
+
 int
 #ifdef NOCLONE
-__attribute__((noinline, noclone))
+__attribute__((noinline)) ATTRIBUTE_NOCLONE
 #else
 __attribute__((noinline))
 #endif
diff --git a/gdb/testsuite/lib/attributes.h b/gdb/testsuite/lib/attributes.h
new file mode 100644
index 0000000..b66567c
--- /dev/null
+++ b/gdb/testsuite/lib/attributes.h
@@ -0,0 +1,40 @@
+/* This file is part of GDB, the GNU debugger.
+
+   Copyright (C) 2020 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Compatibility macro for __attribute__((noclone)).  */
+
+#ifndef ATTRIBUTES_H
+#define ATTRIBUTES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __has_attribute
+# if !__has_attribute (noclone)
+#  define ATTRIBUTE_NOCLONE
+# endif
+#endif
+#ifndef ATTRIBUTE_NOCLONE
+# define ATTRIBUTE_NOCLONE __attribute__((noclone))
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ATTRIBUTES_H */