---
name: "diagtool"
section: "1"
platform: "linux"
package: "clang"
version: "23.1.4-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/diagtool"
---

# diagtool(1)

clang diagnostics tool

## NAME

diagtool - clang diagnostics tool

## SYNOPSIS

**diagtool** *command* \[*args*\]

## DESCRIPTION

**diagtool** is a combination of four tools for dealing with diagnostics in **clang**.

## SUBCOMMANDS

**diagtool** is separated into several subcommands each tailored to a different purpose. A brief summary of each command follows, with more detail in the sections that follow.

- •

  find-diagnostic-id - Print the id of the given diagnostic.

- •

  list-warnings - List warnings and their corresponding flags.

- •

  show-enabled - Show which warnings are enabled for a given command line.

- •

  tree - Show warning flags in a tree view.

### find-diagnostic-id

**diagtool** find-diagnostic-id *diagnostic-name*

### list-warnings

**diagtool** list-warnings

### show-enabled

**diagtool** show-enabled \[*options*\] *filename ...*

### tree

**diagtool** tree \[*diagnostic-group*\]

## Author

Maintained by the Clang / LLVM Team (\<http://clang.llvm.org\>)

## Copyright

2007-2026, The Clang Team