clangd fixes (#80)

.clangd

@@ -0,0 +1,9 @@
+# https://clangd.llvm.org/config
+CompileFlags:
+  # clangd system includes extractor doesn't set -stdlib=libc++,
+  # even though we do when we actually compile, which results in
+  # incorrect system include paths. These fix that.
+  # Specifying non-existent include paths on other platforms doesn't cause issues
+  # (e.g. mentioning linux-gnu works on MacOS).
+  Add: [-nostdinc++, -isystem, external/llvm_toolchain_files/include/x86_64-unknown-linux-gnu/c++/v1, -isystem, external/llvm_toolchain_files/include/c++/v1]
+

.vscode/settings.json

@@ -1,12 +1,13 @@
 {
     "files.watcherExclude": {
+        ".cache/**": true,
         "bazel-*/**": true,
         "external/**": true
     },
     "clangd.arguments": [
         "--header-insertion=never",
         "--compile-commands-dir=${workspaceFolder}/",
-        "--query-driver=**"
+        "--enable-config"
     ],
     "clangd.path": "${workspaceFolder}/external/llvm_toolchain_files/bin/clangd"
 }

README.md

@@ -9,7 +9,7 @@ Should work on Linux and MacOS.
 * Install `bazel` or `bazelisk`
 
 * Verify that you can build and test:
-```
+```sh
 bazel test //...
 ```
 
@@ -22,22 +22,14 @@ Install the recommended extensions. See .vscode/extensions.json.
 Create a compilation database:
 
 ```sh
-bazel build //...
-bazel run @hedron_compile_commands//:refresh_all
+bazel build //... && bazel run @hedron_compile_commands//:refresh_all
 ```
 
 Then configure [clangd](https://clangd.llvm.org/).
 If you're using VS Code, the .vscode/settings does this for you,
 and .vscode/extensions.json already recommends installing the clangd extension.
 
-Otherwise, set these clangd args:
-
-```
---header-insertion=never
---compile-commands-dir=${workspaceFolder}/
---query-driver=**
-```
-
+Otherwise, copy the clangd args from the [.vscode/settings.json](.vscode/settings.json).
 
 ## Status