[Bug target/109713] [14 Regression] gcc/config/riscv/sync.md:66:1: error: control reaches end of non-void function [-Werror=return-type] since r14-406-gbff7c773864479

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109713

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
So something like this can fix it:

diff --git a/gcc/config/riscv/sync.md b/gcc/config/riscv/sync.md
index ba132d8a1ce..206adcfec3c 100644
--- a/gcc/config/riscv/sync.md
+++ b/gcc/config/riscv/sync.md
@@ -61,6 +61,8 @@ (define_insn "mem_thread_fence_1"
        return "fence\tr,rw";
     else if (model == MEMMODEL_RELEASE)
        return "fence\trw,w";
+    else
+        gcc_unreachable ();
   }
   [(set (attr "length") (const_int 4))])