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1 files changed, 24 insertions, 0 deletions

diff --git a/gitlab/issues_text/target_missing/host_s390/accel_missing/1934 b/gitlab/issues_text/target_missing/host_s390/accel_missing/1934
new file mode 100644
index 000000000..9a5f8f15d
--- /dev/null
+++ b/gitlab/issues_text/target_missing/host_s390/accel_missing/1934
@@ -0,0 +1,24 @@
+Build failure on s390x with Clang 17 due to int128 alignment used in `__sync_` operations
+Description of problem:
+We experienced this downstream, but filing this here since the code still seems to be the same in git.
+
+https://reviews.llvm.org/D143813 introduced this warning since, according to the description, `__int128`
+needs to be 8-byte aligned on s390 but the code in `host/include/generic/host/atomic128-ldst.h` unconditionally uses 16-byte alignment.
+
+The output is:
+
+```
+In file included from ../accel/tcg/cputlb.c:32:
+In file included from /builddir/build/BUILD/qemu-8.1.0/include/exec/helper-proto-common.h:10:
+In file included from /builddir/build/BUILD/qemu-8.1.0/include/qemu/atomic128.h:62:
+/builddir/build/BUILD/qemu-8.1.0/host/include/generic/host/atomic128-ldst.h:68:15: error: __sync builtin operation MUST have natural alignment (consider using __atomic). [-Werror,-Wsync-alignment]
+   68 |     } while (!__sync_bool_compare_and_swap_16(ptr_align, old, new.i));
+      |               ^
+In file included from ../accel/tcg/cputlb.c:32:
+In file included from /builddir/build/BUILD/qemu-8.1.0/include/exec/helper-proto-common.h:10:
+In file included from /builddir/build/BUILD/qemu-8.1.0/include/qemu/atomic128.h:61:
+/builddir/build/BUILD/qemu-8.1.0/host/include/generic/host/atomic128-cas.h:36:11: error: __sync builtin operation MUST have natural alignment (consider using __atomic). [-Werror,-Wsync-alignment]
+   36 |     r.i = __sync_val_compare_and_swap_16(ptr_align, c.i, n.i);
+      |           ^
+2 errors generated.
+```