Description: Fix path lookup for WASI previews
 getOS() returns the wrong path for WASI preview targets (wasm-wasip1,
 wasm-wasip2, and wasm-wasip3). For example, passing
 --target=wasm32-wasip1 returns "wasip1". However,
 libclang-rt-22-dev-wasm32 installs wasm32 compiler-rt builtins under
 the "wasi" directory, not the "wasip1" directory, meaning that the
 toolchain is unable to find the builtins it needs.
 .
 This patch makes getOS() return the "wasi" directory when any WASI
 preview target is used, allowing the toolchain to find the proper wasi
 builtins.
Author: Max Gilmour <max.gilmour@canonical.com>
Bug: https://github.com/llvm/llvm-project/issues/200500
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-22/+bug/2152147
Applied-Upstream: https://github.com/llvm/llvm-project/pull/200501
Last-Update: 2026-05-29
---
--- a/clang/lib/Driver/ToolChain.cpp
+++ b/clang/lib/Driver/ToolChain.cpp
@@ -717,6 +717,10 @@
     return "sunos";
   case llvm::Triple::AIX:
     return "aix";
+  case llvm::Triple::WASIp1:
+  case llvm::Triple::WASIp2:
+  case llvm::Triple::WASIp3:
+    return "wasi";
   default:
     return getOS();
   }