LLVM 18 support

.circleci/config.yml

@@ -10,12 +10,12 @@ commands:
     steps:
       - restore_cache:
           keys:
-            - llvm-source-17-v1
+            - llvm-source-18-v1
       - run:
           name: "Fetch LLVM source"
           command: make llvm-source
       - save_cache:
-          key: llvm-source-17-v1
+          key: llvm-source-18-v1
           paths:
             - llvm-project/clang/lib/Headers
             - llvm-project/clang/include
@@ -105,12 +105,12 @@ jobs:
       - test-linux:
           llvm: "15"
     resource_class: large
-  test-llvm17-go122:
+  test-llvm18-go122:
     docker:
       - image: golang:1.22-bullseye
     steps:
       - test-linux:
-          llvm: "17"
+          llvm: "18"
     resource_class: large
 
 workflows:
@@ -119,5 +119,5 @@ workflows:
       # This tests our lowest supported versions of Go and LLVM, to make sure at
       # least the smoke tests still pass.
       - test-llvm15-go118
-      # This tests LLVM 17 support when linking against system libraries.
-      - test-llvm17-go122
+      # This tests LLVM 18 support when linking against system libraries.
+      - test-llvm18-go122