Upgrade Emscripten targets to use upstream LLVM backend

 - Compatible with Emscripten 1.38.46-upstream or later upstream.
 - Refactors the Emscripten target spec to share code with other wasm
   targets.
 - Replaces the old incorrect wasm32 C call ABI with the correct one,
   preserving the old one as wasm32_bindgen_compat for wasm-bindgen
   compatibility.
 - Updates the varargs ABI used by Emscripten and deletes the old one.
 - Removes the obsolete wasm32-experimental-emscripten target.
 - Uses EMCC_CFLAGS on CI to avoid the timeout problems with #63649.

6 files changed, 6 insertions, 0 deletions

diff --git a/src/test/incremental/change_crate_dep_kind.rs b/src/test/incremental/change_crate_dep_kind.rs
index f5d1acb621b..2bcb06d6eb8 100644
--- a/src/test/incremental/change_crate_dep_kind.rs
+++ b/src/test/incremental/change_crate_dep_kind.rs
@@ -1,6 +1,7 @@
 // Test that we detect changes to the `dep_kind` query. If the change is not
 // detected then -Zincremental-verify-ich will trigger an assertion.
 
+// ignore-emscripten compiled with panic=abort by default
 // revisions:cfail1 cfail2
 // compile-flags: -Z query-dep-graph -Cpanic=unwind
 // build-pass (FIXME(62277): could be check-pass?)
diff --git a/src/test/incremental/commandline-args.rs b/src/test/incremental/commandline-args.rs
index e5b84267b29..08a0232f661 100644
--- a/src/test/incremental/commandline-args.rs
+++ b/src/test/incremental/commandline-args.rs
@@ -1,6 +1,7 @@
 // Test that changing a tracked commandline argument invalidates
 // the cache while changing an untracked one doesn't.
 
+// ignore-asmjs wasm2js does not support source maps yet
 // revisions:rpass1 rpass2 rpass3
 // compile-flags: -Z query-dep-graph
 
diff --git a/src/test/incremental/remapped_paths_cc/main.rs b/src/test/incremental/remapped_paths_cc/main.rs
index 12411a92879..b01f02444ea 100644
--- a/src/test/incremental/remapped_paths_cc/main.rs
+++ b/src/test/incremental/remapped_paths_cc/main.rs
@@ -2,6 +2,7 @@
 // compile-flags: -Z query-dep-graph -g
 // aux-build:extern_crate.rs
 
+// ignore-asmjs wasm2js does not support source maps yet
 // This test case makes sure that we detect if paths emitted into debuginfo
 // are changed, even when the change happens in an external crate.
 
diff --git a/src/test/incremental/span_hash_stable/main.rs b/src/test/incremental/span_hash_stable/main.rs
index f1d7de14559..367416430f8 100644
--- a/src/test/incremental/span_hash_stable/main.rs
+++ b/src/test/incremental/span_hash_stable/main.rs
@@ -3,6 +3,7 @@
 // the spans and this test makes sure that we handle them correctly by hashing
 // file:line:column instead of raw byte offset.
 
+// ignore-asmjs wasm2js does not support source maps yet
 // revisions:rpass1 rpass2
 // compile-flags: -g -Z query-dep-graph
 
diff --git a/src/test/incremental/spans_in_type_debuginfo.rs b/src/test/incremental/spans_in_type_debuginfo.rs
index 8ed469db6e6..f5cae15a4bc 100644
--- a/src/test/incremental/spans_in_type_debuginfo.rs
+++ b/src/test/incremental/spans_in_type_debuginfo.rs
@@ -1,6 +1,7 @@
 // Test that moving a type definition within a source file does not affect
 // re-compilation.
 
+// ignore-asmjs wasm2js does not support source maps yet
 // revisions:rpass1 rpass2
 // compile-flags: -Z query-dep-graph -g
 
diff --git a/src/test/incremental/spans_significant_w_debuginfo.rs b/src/test/incremental/spans_significant_w_debuginfo.rs
index 87c97ba06c4..e6fdc7cb3a0 100644
--- a/src/test/incremental/spans_significant_w_debuginfo.rs
+++ b/src/test/incremental/spans_significant_w_debuginfo.rs
@@ -3,6 +3,7 @@
 
 // revisions:rpass1 rpass2
 
+// ignore-asmjs wasm2js does not support source maps yet
 // compile-flags: -g -Z query-dep-graph
 
 #![feature(rustc_attrs)]