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compile_commands.json

compile_commands.json

fpm automatically generates a compile_commands.json file during each successful build or dry run. The file is placed in the build/ directory and provides detailed information about how each source file is compiled.

build/compile_commands.json

It follows the Clang Compilation Database format, widely used by editors, IDEs, and development tools for navigation, static analysis, and diagnostics.

Purpose

The compile_commands.json file enables integration with tools such as:

  • Language Server Protocol (LSP) servers (e.g., fortls)

  • Code editors (e.g., Visual Studio Code)

  • Static analyzers

  • Linters and formatters

These tools use it to retrieve compilation flags, include directories, and output paths automatically.

How It Works

  • Generated during fpm build or fpm build --list

  • Created in build/compile_commands.json

  • No manual configuration required

  • Regenerated after each build or dry run

The --list option performs a dry run: it downloads dependencies and generates compile_commands.json without compiling any source files.

Each command is recorded as a list of parsed arguments, using:

  • shlex on Unix and macOS

  • mslex on Windows

This ensures correct handling of spaces, quotes, and escape characters across platforms.

Example

A minimal entry in compile_commands.json:

[
  {
    "directory": "/path/to/my/fpm/package",
    "arguments": [
      "gfortran",
      "-c",
      "src/module.f90",
      "-Iinclude",
      "-Jbuild",
      "-o",
      "build/module.o"
    ],
    "file": "src/module.f90"
  }
]

Working with the File

As a standard JSON file, it can be inspected using any JSON tool. For example, to pretty-print it:

cat build/compile_commands.json | jq .

Limitations

  • Only created after a successful build or dry run

  • Currently not configurable via fpm.toml

  • Overwrites any previous version during each build

  • Feature available since v0.12.0.

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