Revert "Revert "Move llvm submodule updates to rustbuild""

This reverts commit ad308264a38531bc8d2179324bac3652a1cda640.

1 files changed, 4 insertions, 12 deletions

diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 149a899cef7..bd5b3797ea8 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -991,28 +991,20 @@ class RustBuild(object):
         ).decode(default_encoding).splitlines()]
         filtered_submodules = []
         submodules_names = []
-        llvm_checked_out = os.path.exists(os.path.join(self.rust_root, "src/llvm-project/.git"))
-        external_llvm_provided = self.get_toml('llvm-config') or self.downloading_llvm()
-        llvm_needed = not self.get_toml('codegen-backends', 'rust') \
-            or "llvm" in self.get_toml('codegen-backends', 'rust')
         for module in submodules:
+            # This is handled by native::Llvm in rustbuild, not here
             if module.endswith("llvm-project"):
-                # Don't sync the llvm-project submodule if an external LLVM was
-                # provided, if we are downloading LLVM or if the LLVM backend is
-                # not being built. Also, if the submodule has been initialized
-                # already, sync it anyways so that it doesn't mess up contributor
-                # pull requests.
-                if external_llvm_provided or not llvm_needed:
-                    if self.get_toml('lld') != 'true' and not llvm_checked_out:
-                        continue
+                continue
             check = self.check_submodule(module, slow_submodules)
             filtered_submodules.append((module, check))
             submodules_names.append(module)
         recorded = subprocess.Popen(["git", "ls-tree", "HEAD"] + submodules_names,
                                     cwd=self.rust_root, stdout=subprocess.PIPE)
         recorded = recorded.communicate()[0].decode(default_encoding).strip().splitlines()
+        # { filename: hash }
         recorded_submodules = {}
         for data in recorded:
+            # [mode, kind, hash, filename]
             data = data.split()
             recorded_submodules[data[3]] = data[2]
         for module in filtered_submodules: