Disable automatic `#include` insertion for clangd (#7951)

1 files changed, 17 insertions, 4 deletions

diff --git a/flake.nix b/flake.nix
index 5b63b0e4c..3f1bf6e62 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,10 +21,23 @@
         # the latter brings in GCC by default on Linux.
         devShell = pkgs.mkShellNoCC {
           buildInputs = [
-            # Must put `clang-tools` before `clang` for clangd to work properly.
-            # We use `llvmPackages_17.clang-tools` instead of just `clang-tools`
-            # to match the `clang-format` version used in CI.
-            pkgs.llvmPackages_17.clang-tools
+            # We must list clangd before the `clang` package to make sure it
+            # comes earlier on the `PATH`, and we must get it from the
+            # `clang-tools` package so that it is wrapped properly.
+            (pkgs.linkFarm "clangd-21" [
+              {
+                name = "bin/clangd";
+                # New enough to support `HeaderInsertion: Never` in `.clangd`.
+                path = "${pkgs.llvmPackages_21.clang-tools}/bin/clangd";
+              }
+            ])
+            (pkgs.linkFarm "clang-format-17" [
+              {
+                name = "bin/clang-format";
+                # Match the clang-format version used in CI.
+                path = "${pkgs.llvmPackages_17.clang-tools}/bin/clang-format";
+              }
+            ])
 
             pkgs.clang
             pkgs.cmake