Fix lazy compilation of standard lib in -resource-dir

patch.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+PATCH_DIR="$(cd "$(dirname "$0")/patches"; pwd)"
+
+for patch_subdir in "$PATCH_DIR"/*; do
+  (
+    repo="$(basename "$patch_subdir")"
+    cd "$repo" || exit 0
+    echo "patching $repo"
+    for patch in "$patch_subdir"/*; do
+      echo "  applying $(basename "$patch")"
+      git apply "$patch"
+    done
+  )
+done

patches/swift/01-remove-assert-in-fallthrough-stmt.patch

@@ -0,0 +1,15 @@
+There are some cases when we extract bad ASTs where we hit this assertion if we compile in debug
+mode. This is undesirable.
+
+diff --git a/include/swift/AST/Stmt.h b/include/swift/AST/Stmt.h
+index 532e038c386..f013eee2f98 100644
+--- a/include/swift/AST/Stmt.h
++++ b/include/swift/AST/Stmt.h
+@@ -920,7 +920,6 @@ public:
+   /// Get the CaseStmt block to which the fallthrough transfers control.
+   /// Set during Sema.
+   CaseStmt *getFallthroughDest() const {
+-    assert(FallthroughDest && "fallthrough dest is not set until Sema");
+     return FallthroughDest;
+   }
+   void setFallthroughDest(CaseStmt *C) {

swift-build-system.patch → patches/swift/02-handle-empty-pattern-list.patch

@@ -1,15 +1,6 @@
-diff --git a/include/swift/AST/Stmt.h b/include/swift/AST/Stmt.h
-index 532e038c386..f013eee2f98 100644
---- a/include/swift/AST/Stmt.h
-+++ b/include/swift/AST/Stmt.h
-@@ -920,7 +920,6 @@ public:
-   /// Get the CaseStmt block to which the fallthrough transfers control.
-   /// Set during Sema.
-   CaseStmt *getFallthroughDest() const {
--    assert(FallthroughDest && "fallthrough dest is not set until Sema");
-     return FallthroughDest;
-   }
-   void setFallthroughDest(CaseStmt *C) {
+`PatternBindingDecl::getPatternList()` can in some cases return an empty list, which causes a
+segmentation fault when getting the source range. This case needs to be handled for the extractor.
+
 diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
 index 75b99a22e73..09115678a82 100644
 --- a/lib/AST/Decl.cpp

patches/swift/03-reinstate-swiftinterface-compilation-for-resource-dir.patch

@@ -0,0 +1,30 @@
+When running the extractor against a different version of the swift compiler, we provide it the
+original standard library via `-resource-dir`, and we do want that to be lazily compiled out of the
+`.swiftinterface` files. The code removed here explicitly disables that behavior.
+
+diff --git a/lib/Frontend/ModuleInterfaceLoader.cpp b/lib/Frontend/ModuleInterfaceLoader.cpp
+index 2a490a680d8..8d8f48aeed0 100644
+--- a/lib/Frontend/ModuleInterfaceLoader.cpp
++++ b/lib/Frontend/ModuleInterfaceLoader.cpp
+@@ -726,21 +726,6 @@ class ModuleInterfaceLoaderImpl {
+                                   << "; deferring to serialized module loader\n");
+           UsableModulePath = adjacentMod;
+           return std::make_error_code(std::errc::not_supported);
+-        } else if (isInResourceDir(adjacentMod) &&
+-                   loadMode == ModuleLoadingMode::PreferSerialized) {
+-          // Special-case here: If we're loading a .swiftmodule from the resource
+-          // dir adjacent to the compiler, defer to the serialized loader instead
+-          // of falling back. This is mainly to support development of Swift,
+-          // where one might change the module format version but forget to
+-          // recompile the standard library. If that happens, don't fall back
+-          // and silently recompile the standard library -- instead, error like
+-          // we used to.
+-          LLVM_DEBUG(llvm::dbgs() << "Found out-of-date module in the "
+-                                     "resource-dir at "
+-                                  << adjacentMod
+-                                  << "; deferring to serialized module loader "
+-                                     "to diagnose\n");
+-          return std::make_error_code(std::errc::not_supported);
+         } else {
+           LLVM_DEBUG(llvm::dbgs() << "Found out-of-date module at "
+                                   << adjacentMod << "\n");