[gcc r12-7177] libstdc++: Add atomic_fetch_xor to <stdatomic.h>

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:3e539985cc7a28516054cc080ffd9681aa745afa

commit r12-7177-g3e539985cc7a28516054cc080ffd9681aa745afa
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Feb 9 13:38:33 2022 +0000

    libstdc++: Add atomic_fetch_xor to <stdatomic.h>
    
    This function (and the explicit memory over version) are present in both
    C++ <atomic> and C <stdatomic.h>, so should be in C++ <stdatomic.h> too.
    There is a library issue incoming for this, but the resolution is
    obvious.
    
    libstdc++-v3/ChangeLog:
    
            * include/c_compatibility/stdatomic.h (atomic_fetch_xor): Add
            using-declaration.
            (atomic_fetch_xor_explicit): Likewise.
            * testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Check
            arithmetic and logical operations for atomic_int.

Diff:
---
 libstdc++-v3/include/c_compatibility/stdatomic.h              |  2 ++
 .../testsuite/29_atomics/headers/stdatomic.h/c_compat.cc      | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/libstdc++-v3/include/c_compatibility/stdatomic.h b/libstdc++-v3/include/c_compatibility/stdatomic.h
index 95c72615b4e..c97cbac984e 100644
--- a/libstdc++-v3/include/c_compatibility/stdatomic.h
+++ b/libstdc++-v3/include/c_compatibility/stdatomic.h
@@ -111,6 +111,8 @@ using std::atomic_fetch_sub;
 using std::atomic_fetch_sub_explicit;
 using std::atomic_fetch_or;
 using std::atomic_fetch_or_explicit;
+using std::atomic_fetch_xor;
+using std::atomic_fetch_xor_explicit;
 using std::atomic_fetch_and;
 using std::atomic_fetch_and_explicit;
 using std::atomic_flag_test_and_set;
diff --git a/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/c_compat.cc b/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/c_compat.cc
index 80d2e150647..6dd4f5b00ca 100644
--- a/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/c_compat.cc
+++ b/libstdc++-v3/testsuite/29_atomics/headers/stdatomic.h/c_compat.cc
@@ -116,6 +116,17 @@ static_assert( requires (::atomic_int* i, int* e) {
   ::atomic_compare_exchange_weak_explicit(i, e, 3,
 					  memory_order_acq_rel,
 					  memory_order_relaxed);
+
+  ::atomic_fetch_add(i, 1);
+  ::atomic_fetch_add_explicit(i, 1, memory_order_relaxed);
+  ::atomic_fetch_sub(i, 1);
+  ::atomic_fetch_sub_explicit(i, 1, memory_order_relaxed);
+  ::atomic_fetch_and(i, 1);
+  ::atomic_fetch_and_explicit(i, 1, memory_order_relaxed);
+  ::atomic_fetch_or(i, 1);
+  ::atomic_fetch_or_explicit(i, 1, memory_order_relaxed);
+  ::atomic_fetch_xor(i, 1);
+  ::atomic_fetch_xor_explicit(i, 1, memory_order_relaxed);
 } );
 
 static_assert( requires (::atomic_flag* f) {