[gcc r12-1110] C-SKY: Define HAVE_sync_compare_and_swap*.

[gcc r12-1110] C-SKY: Define HAVE_sync_compare_and_swap*.

[qu]

https://gcc.gnu.org/g:f69a1aee157f496e6d3f373fff1b26b03bbf3409

commit r12-1110-gf69a1aee157f496e6d3f373fff1b26b03bbf3409
Author: Cooper Qu <cooper.qu@linux.alibaba.com>
Date:   Fri May 28 17:02:05 2021 +0800

    C-SKY: Define HAVE_sync_compare_and_swap*.
    
    The SYNC operations are implemented as library functions, not
    NSN patterns.  As a result, the HAVE defines for the patterns are
    not defined.  We need to define them to generate the corresponding
    __GCC_HAVE_SYNC_COMPARE_AND_SWAP_* and __GCC_ATOMIC_*_LOCK_FREE
    defines.
    
    gcc/
            * config/csky/csky-linux-elf.h (HAVE_sync_compare_and_swapqi):
            Defined.
            (HAVE_sync_compare_and_swaphi): Likewise.
            (HAVE_sync_compare_and_swapsi): Likewise.

Diff:
---
 gcc/config/csky/csky-linux-elf.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gcc/config/csky/csky-linux-elf.h b/gcc/config/csky/csky-linux-elf.h
index 58a1f3978b1..e94eb8c579e 100644
--- a/gcc/config/csky/csky-linux-elf.h
+++ b/gcc/config/csky/csky-linux-elf.h
@@ -133,3 +133,13 @@
 #ifdef IN_LIBGCC2
 extern int cacheflush (void *__addr, const int __nbytes, const int __op);
 #endif
+
+/* The SYNC operations are implemented as library functions, not
+   INSN patterns.  As a result, the HAVE defines for the patterns are
+   not defined.  We need to define them to generate the corresponding
+   __GCC_HAVE_SYNC_COMPARE_AND_SWAP_* and __GCC_ATOMIC_*_LOCK_FREE
+   defines.  */
+
+#define HAVE_sync_compare_and_swapqi 1
+#define HAVE_sync_compare_and_swaphi 1
+#define HAVE_sync_compare_and_swapsi 1