Rollup merge of rust-lang#67975 - EmbarkStudios:export-statics-wasm, r=alexcrichton

Export public scalar statics in wasm

Fixes rust-lang#67453

I am not sure which export level statics should get when exporting them in wasm. This small change fixes the issue that I had, but this might not be the correct way to implement this.

Author: JohnTitor

src/librustc_codegen_ssa/back/symbol_export.rs

@@ -345,7 +345,7 @@ fn symbol_export_level(tcx: TyCtxt<'_>, sym_def_id: DefId) -> SymbolExportLevel
     if is_extern && !std_internal {
         let target = &tcx.sess.target.target.llvm_target;
         // WebAssembly cannot export data symbols, so reduce their export level
-        if target.contains("wasm32") || target.contains("emscripten") {
+        if target.contains("emscripten") {
             if let Some(Node::Item(&hir::Item { kind: hir::ItemKind::Static(..), .. })) =
                 tcx.hir().get_if_local(sym_def_id)
             {

src/test/run-make/wasm-export-all-symbols/bar.rs

@@ -2,3 +2,6 @@
 
 #[no_mangle]
 pub extern fn foo() {}
+
+#[no_mangle]
+pub static FOO: u64 = 42;

src/test/run-make/wasm-export-all-symbols/verify.js

@@ -9,16 +9,20 @@ console.log('exports', list);
 
 const my_exports = {};
 let nexports = 0;
+
 for (const entry of list) {
-  if (entry.kind !== 'function')
-    continue;
-  my_exports[entry.name] = true;
-  nexports += 1;
+  if (entry.kind == 'function'){
+    nexports += 1;
+  }
+  my_exports[entry.name] = entry.kind;
 }
 
-if (my_exports.foo === undefined)
+if (my_exports.foo != "function")
   throw new Error("`foo` wasn't defined");
 
+if (my_exports.FOO != "global")
+  throw new Error("`FOO` wasn't defined");
+
 if (my_exports.main === undefined) {
   if (nexports != 1)
     throw new Error("should only have one function export");