1 files changed, 23 insertions, 0 deletions
diff --git a/llvm/tools/llvm-config/llvm-config.cpp b/llvm/tools/llvm-config/llvm-config.cpp
index 6c31df3e173b..fb12e29a36a8 100644
--- a/llvm/tools/llvm-config/llvm-config.cpp
+++ b/llvm/tools/llvm-config/llvm-config.cpp
@@ -46,6 +46,10 @@ using namespace llvm;
 // create entries for pseudo groups like x86 or all-targets.
 #include "LibraryDependencies.inc"
 
+// Built-in extensions also register their dependencies, but in a separate file,
+// later in the process.
+#include "ExtensionDependencies.inc"
+
 // LinkMode determines what libraries and flags are returned by llvm-config.
 enum LinkMode {
   // LinkModeAuto will link with the default link mode for the installation,
@@ -110,6 +114,25 @@ static void VisitComponent(const std::string &Name,
                    GetComponentLibraryPath, Missing, DirSep);
   }
 
+  // Special handling for the special 'extensions' component. Its content is
+  // not populated by llvm-build, but later in the process and loaded from
+  // ExtensionDependencies.inc.
+  if (Name == "extensions") {
+    for (auto const &AvailableExtension : AvailableExtensions) {
+      for (const char *const *Iter = &AvailableExtension.RequiredLibraries[0];
+           *Iter; ++Iter) {
+        AvailableComponent *AC = ComponentMap.lookup(*Iter);
+        if (!AC) {
+          RequiredLibs.push_back(*Iter);
+        } else {
+          VisitComponent(*Iter, ComponentMap, VisitedComponents, RequiredLibs,
+                         IncludeNonInstalled, GetComponentNames,
+                         GetComponentLibraryPath, Missing, DirSep);
+        }
+      }
+    }
+  }
+
   if (GetComponentNames) {
     RequiredLibs.push_back(Name);
     return;