rustbuild: WebAssembly is no longer an experimental LLVM backend

Author: lenary

config.toml.example

@@ -57,14 +57,13 @@
 # support. You'll need to write a target specification at least, and most
 # likely, teach rustc about the C ABI of the target. Get in touch with the
 # Rust team and file an issue if you need assistance in porting!
-#targets = "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;Sparc;SystemZ;X86"
+#targets = "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;Sparc;SystemZ;WebAssembly;X86"
 
 # LLVM experimental targets to build support for. These targets are specified in
 # the same format as above, but since these targets are experimental, they are
 # not built by default and the experimental Rust compilation targets that depend
-# on them will not work unless the user opts in to building them. By default the
-# `WebAssembly` target is enabled when compiling LLVM from scratch.
-#experimental-targets = "WebAssembly"
+# on them will not work unless the user opts in to building them.
+#experimental-targets = ""
 
 # Cap the number of parallel linker invocations when compiling LLVM.
 # This can be useful when building LLVM with debug info, which significantly

src/bootstrap/native.rs

@@ -125,7 +125,7 @@ impl Step for Llvm {
         } else {
             match builder.config.llvm_targets {
                 Some(ref s) => s,
-                None => "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;Sparc;SystemZ;X86",
+                None => "AArch64;ARM;Hexagon;MSP430;Mips;NVPTX;PowerPC;RISCV;Sparc;SystemZ;WebAssembly;X86",
             }
         };
 
@@ -134,7 +134,7 @@ impl Step for Llvm {
         } else {
             match builder.config.llvm_experimental_targets {
                 Some(ref s) => s,
-                None => "WebAssembly",
+                None => "",
             }
         };