[gcc r13-6404] testsuite: Fix gcc.dg/attr-copy-6.c for user-label-prefixed targets

[Hans-Peter Nilsson <hp@gcc.gnu.org>]

https://gcc.gnu.org/g:b838a9f65f68f9ebe87d4cbd10ae18911a05b6ea

commit r13-6404-gb838a9f65f68f9ebe87d4cbd10ae18911a05b6ea
Author: Hans-Peter Nilsson <hp@axis.com>
Date:   Wed Mar 1 17:30:07 2023 +0100

    testsuite: Fix gcc.dg/attr-copy-6.c for user-label-prefixed targets
    
    This fixes:
     Running /x/gcc/testsuite/gcc.dg/dg.exp ...
     ...
     FAIL: gcc.dg/attr-copy-6.c (test for excess errors)
    for cris-elf, where gcc.log has:
    Excess errors:
    /x/gcc/testsuite/gcc.dg/attr-copy-6.c:91:3: error: 'fnoreturn_alias' aliased to undefined symbol 'fnoreturn_name'
    
    Asm-declared identifiers need to prepend __USER_LABEL_PREFIX__
    to the asm-name, something which is often overlooked because
    it's empty for most targets.  N.B: attribute-alias does not need
    the same treatment.  The identical construct added here, is in
    several tests.
    
            * gcc.dg/attr-copy-6.c: Prefix asm-declared name with
            __USER_LABEL_PREFIX__.

Diff:
---
 gcc/testsuite/gcc.dg/attr-copy-6.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/attr-copy-6.c b/gcc/testsuite/gcc.dg/attr-copy-6.c
index cf578bddb1b..30a1317bf92 100644
--- a/gcc/testsuite/gcc.dg/attr-copy-6.c
+++ b/gcc/testsuite/gcc.dg/attr-copy-6.c
@@ -9,6 +9,10 @@
 #define ATTR(...)   __attribute__ ((__VA_ARGS__))
 #define ASRT(expr)   _Static_assert (expr, #expr)
 
+#define ASMNAME(cname)  ASMNAME2 (__USER_LABEL_PREFIX__, cname)
+#define ASMNAME2(prefix, cname) STRING (prefix) cname
+#define STRING(x)    #x
+
 /* Variable that is local to this translation unit but that can
    be modified from other units by calling reset_unit_local().  */
 static int unit_local;
@@ -79,7 +83,7 @@ extern _Noreturn void fnoreturn (void);
 
 extern __typeof (fnoreturn)
   ATTR (visibility ("hidden"))
-  fnoreturn __asm__ ("fnoreturn_name");
+  fnoreturn __asm__ (ASMNAME ("fnoreturn_name"));
 
 void fnoreturn (void)
 {