llvm-config: replace assertions with a helpful error message

From: Mehdi Amini <mehdi.amini@apple.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@260700 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 0 deletions

diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index a867e1b60d8..e5b121006f5 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -83,6 +83,14 @@ static void VisitComponent(const std::string &Name,
                            const std::string &DirSep) {
   // Lookup the component.
   AvailableComponent *AC = ComponentMap.lookup(Name);
+  if (!AC) {
+    errs() << "Can't find component: '" << Name << "' in the map. Available components are: ";
+    for (const auto &Component : ComponentMap) {
+      errs() << "'" << Component.first() << "' ";
+    }
+    errs() << "\n";
+    report_fatal_error("abort");
+  }
   assert(AC && "Invalid component name!");
 
   // Add to the visited table.