Auto merge of #55626 - nikic:update-emscripten, r=alexcrichton

Update emscripten

This updates emscripten to 1.38.15, which is based on LLVM 6.0.1 and would allow us to drop code for handling LLVM 4.

The main issue I ran into is that exporting statics through `EXPORTED_FUNCTIONS` no longer works. As far as I understand exporting non-functions doesn't really make sense under emscripten anyway, so I've modified the symbol export code to not even try.

Closes #52323.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bootstrap/compile.rs b/src/bootstrap/compile.rs
index 885ad07e087..cef0849937b 100644
--- a/src/bootstrap/compile.rs
+++ b/src/bootstrap/compile.rs
@@ -736,7 +736,7 @@ pub fn build_codegen_backend(builder: &Builder,
 
             // Pass down configuration from the LLVM build into the build of
             // librustc_llvm and librustc_codegen_llvm.
-            if builder.is_rust_llvm(target) {
+            if builder.is_rust_llvm(target) && backend != "emscripten" {
                 cargo.env("LLVM_RUSTLLVM", "1");
             }
             cargo.env("LLVM_CONFIG", &llvm_config);