[clang] [WebAssembly] fix: respect -Wl, --no-demangle option (PR #213878)

[Martin Liška via cfe-commits]

https://github.com/marxin created https://github.com/llvm/llvm-project/pull/213878

Right now, the option is not passed to the wasm-ld.

>From 79177e78b6170a8d6cb81d087b757c5d136622ef Mon Sep 17 00:00:00 2001
From: Martin Liska <martin.liska at hey.com>
Date: Tue, 4 Aug 2026 10:51:29 +0200
Subject: [PATCH] [WebAssembly] fix: respect -Wl,--no-demangle option

Right now, the option is not passed to the wasm-ld.
---
 clang/lib/Driver/ToolChains/WebAssembly.cpp | 3 +++
 clang/test/Driver/wasm-toolchain.c          | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/clang/lib/Driver/ToolChains/WebAssembly.cpp b/clang/lib/Driver/ToolChains/WebAssembly.cpp
index 7dabefbee7f79..2e8afb163b30a 100644
--- a/clang/lib/Driver/ToolChains/WebAssembly.cpp
+++ b/clang/lib/Driver/ToolChains/WebAssembly.cpp
@@ -121,6 +121,9 @@ void wasm::Linker::ConstructJob(Compilation &C, const JobAction &JA,
   if (Args.hasArg(options::OPT_s))
     CmdArgs.push_back("--strip-all");
 
+  if (Args.hasArg(options::OPT_Z_Xlinker__no_demangle))
+    CmdArgs.push_back("--no-demangle");
+
   // On `wasip2` the default linker is `wasm-component-ld` which wraps the
   // execution of `wasm-ld`. Find `wasm-ld` and pass it as an argument of where
   // to find it to avoid it needing to hunt and rediscover or search `PATH` for
diff --git a/clang/test/Driver/wasm-toolchain.c b/clang/test/Driver/wasm-toolchain.c
index c02a102fab081..467d79e57aff1 100644
--- a/clang/test/Driver/wasm-toolchain.c
+++ b/clang/test/Driver/wasm-toolchain.c
@@ -19,6 +19,10 @@
 // LINK: "-cc1" {{.*}} "-o" "[[temp:[^"]*]]"
 // LINK: wasm-ld{{.*}}" "-L/foo/lib" "crt1.o" "[[temp]]" "-lc" "{{.*[/\\]}}libclang_rt.builtins.a" "-o" "a.out"
 
+// RUN: %clang -### --target=wasm32-unknown-unknown --sysroot=/foo %s -Wl,--no-demangle 2>&1 \
+// RUN:   | FileCheck -check-prefix=LINK_NO_DEMANGLE %s
+// LINK_NO_DEMANGLE: wasm-ld{{.*}}"--no-demangle"
+
 // A basic C link command-line with optimization with unknown OS.
 
 // RUN: %clang -### -O2 --target=wasm32-unknown-unknown --sysroot=/foo %s 2>&1 \