clangd not loading system includes, despite build success

[cssharsha]

Hey, This looks like a wonderful tool and I have been trying to use this to generate the compile_commands.json for my project. I am trying to run this inside a dev container in vscode. I am using a custom toolchain for the project. Although the build is successful I have not been able to get the clangd functionality working. Maybe it does not find the clang includes that are built/added by the toolchain? Any insight would be great. I am adding the WORKSPACE file here for reference:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "toolchains_llvm",
    sha256 = "e91c4361f99011a54814e1afbe5c436e0d329871146a3cd58c23a2b4afb50737",
    strip_prefix = "toolchains_llvm-1.0.0",
    canonical_id = "1.0.0",
    url = "https://github.com/bazel-contrib/toolchains_llvm/releases/download/1.0.0/toolchains_llvm-1.0.0.tar.gz",
)

load("@toolchains_llvm//toolchain:deps.bzl", "bazel_toolchain_dependencies")

bazel_toolchain_dependencies()

load("@toolchains_llvm//toolchain:rules.bzl", "llvm_toolchain")

llvm_toolchain(
    name = "llvm_toolchain",
    llvm_version = "16.0.0",
)

load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")

llvm_register_toolchains()

http_archive(
    name = "com_google_googletest",
    urls = ["https://github.com/google/googletest/archive/refs/tags/v1.14.0.zip"],
    strip_prefix = "googletest-1.14.0",
)

# Hedron's Compile Commands Extractor for Bazel
# https://github.com/hedronvision/bazel-compile-commands-extractor
http_archive(
    name = "hedron_compile_commands",

    # Replace the commit hash (a14ad3a64e7bf398ab48105aaa0348e032ac87f8) in both places (below) with the latest (https://github.com/hedronvision/bazel-compile-commands-extractor/commits/main), rather than using the stale one here.
    # Even better, set up Renovate and let it do the work for you (see "Suggestion: Updates" in the README).
    url = "https://github.com/hedronvision/bazel-compile-commands-extractor/archive/a14ad3a64e7bf398ab48105aaa0348e032ac87f8.tar.gz",
    strip_prefix = "bazel-compile-commands-extractor-a14ad3a64e7bf398ab48105aaa0348e032ac87f8",
    # When you first run this tool, it'll recommend a sha256 hash to put here with a message like: "DEBUG: Rule 'hedron_compile_commands' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = ..."
)
load("@hedron_compile_commands//:workspace_setup.bzl", "hedron_compile_commands_setup")
hedron_compile_commands_setup()
load("@hedron_compile_commands//:workspace_setup_transitive.bzl", "hedron_compile_commands_setup_transitive")
hedron_compile_commands_setup_transitive()
load("@hedron_compile_commands//:workspace_setup_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive")
hedron_compile_commands_setup_transitive_transitive()
load("@hedron_compile_commands//:workspace_setup_transitive_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive_transitive")
hedron_compile_commands_setup_transitive_transitive_transitive()

I am just using the top level command to generate the compile_commands file since this is fairly small project with just two targets (bazel run @hedron_compile_commands//:refresh_all)

[cpsauer]

Any luck, Sree? If you indeed did solve it, any chance you'd be down to drop a note for future folks?

[cssharsha]

Hey @cpsauer, thanks for the reply. I was away on the weekend and just saw your message. Looks like clangd doesn't like when I have two different llvm toolchains added. Changed it to one and looks like it now works.

Appreciate the active support btw!