├── .gitignore ├── LICENSE ├── README.md ├── cc-wrapper-hook ├── default.nix ├── mini-compile-commands-hook ├── mini_compile_commands_client.py ├── mini_compile_commands_server.py └── tests ├── build └── hook.nix ├── clang ├── shell.nix └── test.cc └── gcc ├── shell.nix └── test.cc /.gitignore: -------------------------------------------------------------------------------- 1 | compile_commands.json 2 | .cache 3 | tests/build/result -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Mini Compile Commands 2 | 3 | Mini compile commands instruments the compiler wrappers in nixpkgs to generate `compile_commands.json` files. Using a version of nixpkgs after [this PR](https://github.com/NixOS/nixpkgs/pull/197937), it can be used in a `shell.nix` as follows: 4 | 5 | ``` 6 | with import {}; 7 | let mcc-env = (callPackage {}).wrap stdenv; 8 | in (mkShell.override {stdenv = mcc-env;}) { 9 | buildInputs = [ cmake gtest ]; 10 | } 11 | ``` 12 | 13 | When the compiler is invoked, it will send a message to `mini_compile_commands_server.py`: 14 | 15 | https://user-images.githubusercontent.com/8081722/192353380-5c417134-1cf5-4f60-97c1-386f24b0d4f7.mp4 16 | 17 | ## Mini Compile Commands and flakes 18 | 19 | If your project is flake based, add `mini-compile-commands = { url = github:danielbarter/mini_compile_commands; flake = false;};` to your inputs and `mini-compile-commands` as an argument to your outputs. Then the above development shell output would be specified as 20 | 21 | ``` 22 | devShell.x86_64-linux = 23 | with import nixpkgs { system = "x86_64-linux"; }; 24 | let mcc-env = (callPackage mini-compile-commands {}).wrap stdenv; 25 | in (mkShell.override {stdenv = mcc-env;}) { 26 | buildInputs = [ cmake gtest ]; 27 | }; 28 | ``` 29 | 30 | ## Examples 31 | 32 | Mini compile commands can be used to generate a `compile_commands.json` for the linux kernel: 33 | 34 | ``` 35 | nix-shell -E 'with import {}; let mcc-env = (callPackage {}).wrap stdenv; in linux.override { stdenv = mcc-env; }' 36 | ``` 37 | 38 | As demonstrated in the above video, create two shells. In one, run `mini_compile_commands_server.py compile_commands.json` and in the other, run `genericBuild`. 39 | 40 | For certain packages (like those included in `python3Packages`), there is currently no easy way to override the standard environment. To use mini compile commands for these packages, we can override the standard environment for all nixpkgs as follows: 41 | 42 | ``` 43 | nix-build -E 'with import { config.replaceStdenv = ({ pkgs }: (pkgs.callPackage {}).wrap pkgs.stdenv);}; python3Packages.pybind11' 44 | ``` 45 | 46 | Warning: This requires a huge amount of rebuilding. 47 | 48 | ## Testing 49 | 50 | There are tests for `gcc` and `clang` in `tests/gcc` and `tests/clang` respectively. In either of these directories, running `nix-shell` will generate a `compile_commands.json`. To test if things are working, open `test.cc` (make sure your editor can locate clangd) and try and jump into the `iostream` header. 51 | 52 | ## Build input hook 53 | 54 | It is possible to use mini compile commands to generate a `compile_commands.json` while building a derivation. This involves using a wrapped standard standard environment and adding a hook to the `buildInputs`: 55 | ``` 56 | with import {}; 57 | let mcc-env = (callPackage {}).wrap stdenv; 58 | mcc-hook = (callPackage {}).hook; 59 | in (hello.override { stdenv = mcc-env; }).overrideAttrs 60 | (finalAttrs: previousAttrs: { 61 | buildInputs = (previousAttrs.buildInputs or []) ++ [ mcc-hook ]; 62 | }) 63 | ``` 64 | Running `nix-build` on this derivation will generate a `compile_commands.json` and move it into `$out`. As explained in [the compile commands specification](https://clang.llvm.org/docs/JSONCompilationDatabase.html), each entry contains a `directory` attribute which is the absolute path of the directory from which the compiler invocation occurred. To use this generated json with `clangd`, the source code needs to be located in the same place as during the nix build (typically `/build`). Since this is inconvenient, we recommend using mini compile commands interactively. 65 | -------------------------------------------------------------------------------- /cc-wrapper-hook: -------------------------------------------------------------------------------- 1 | if [ -e "/tmp/mini_compile_commands_unix_socket" ] 2 | then 3 | @mini_compile_commands_client@ $(pwd) ${compiler} \ 4 | ${extraBefore+"${extraBefore[@]}"} \ 5 | ${params+"${params[@]}"} \ 6 | ${extraAfter+"${extraAfter[@]}"} 7 | fi 8 | -------------------------------------------------------------------------------- /default.nix: -------------------------------------------------------------------------------- 1 | { stdenv 2 | , python3Minimal 3 | , lib 4 | , makeSetupHook 5 | }: 6 | 7 | rec { 8 | # function for wrapping a standard environment to include the 9 | # compile commands generation functionality 10 | wrap = env: 11 | let 12 | # currently, gcc is bundled with the C++ standard library and runtime libraries 13 | # so it is able to find them automatically. This is a hack to explicitly pass 14 | # then as command line arguments. Eventually, the plan is that these libraries will 15 | # be split out: https://github.com/NixOS/nixpkgs/issues/132340. Once that happens, 16 | # this hack will no longer be needed (and will no longer work) 17 | gcc-hack = lib.optionalString env.cc.isGNU '' 18 | libcxxflags=$out/nix-support/libcxx-cxxflags 19 | libcflags=$out/nix-support/libc-cflags 20 | echo -isystem ${env.cc.cc}/include/c++/${env.cc.cc.version} >> $libcxxflags 21 | echo -isystem ${env.cc.cc}/include/c++/${env.cc.cc.version}/${env.hostPlatform.config} >> $libcxxflags 22 | echo -isystem ${env.cc.cc}/lib/gcc/${env.hostPlatform.config}/${env.cc.cc.version}/include >> $libcflags 23 | ''; 24 | cc-hook = '' 25 | ln -s ${package}/bin/cc-wrapper-hook $out/nix-support/cc-wrapper-hook 26 | '' + gcc-hack; 27 | in 28 | env.override (old: { 29 | cc = old.cc.overrideAttrs (final: previous: { 30 | installPhase = previous.installPhase or "" + cc-hook; 31 | }); 32 | extraBuildInputs = old.extraBuildInputs or [] ++ [ package ]; 33 | allowedRequisites = null; 34 | }); 35 | 36 | # hook which will generate a compile_commands.json while building a derivation 37 | hook = makeSetupHook 38 | { name = "mini-compile-commands-hook"; } ./mini-compile-commands-hook; 39 | 40 | # mini compile commands package. You probably don't want to use this directly. 41 | # instead, wrap your standard environment: ( mini-compile-commands.wrap stdenv ) 42 | package = stdenv.mkDerivation { 43 | name = "mini_compile_commands"; 44 | 45 | src = ./.; 46 | 47 | # specifying python environment variable so that it gets substituted 48 | # during install phase 49 | python = python3Minimal; 50 | 51 | installPhase = '' 52 | mkdir -p $out/bin 53 | export mini_compile_commands_client=$out/bin/mini_compile_commands_client.py 54 | for file in *.py cc-wrapper-hook; do 55 | substituteAll $src/$file $out/bin/$file 56 | chmod +x $out/bin/$file 57 | done 58 | ''; 59 | }; 60 | } 61 | -------------------------------------------------------------------------------- /mini-compile-commands-hook: -------------------------------------------------------------------------------- 1 | startMiniCompileCommandsServer() { 2 | mini_compile_commands_server.py & # spawn server as a background job 3 | MINI_COMPILE_COMMANDS_PID=$! # extract server pid 4 | SERVER_DIR=$(pwd) # extract server working directory 5 | sleep 1 # wait for server to startup 6 | } 7 | 8 | stopMiniCompileCommandsServer() { 9 | kill -s SIGINT $MINI_COMPILE_COMMANDS_PID # kill server 10 | wait $MINI_COMPILE_COMMANDS_PID # wait for server to shutdown 11 | mv "$SERVER_DIR"/compile_commands.json $out # move json to output 12 | } 13 | 14 | preConfigureHooks+=(startMiniCompileCommandsServer) 15 | postFixupHooks+=(stopMiniCompileCommandsServer) 16 | -------------------------------------------------------------------------------- /mini_compile_commands_client.py: -------------------------------------------------------------------------------- 1 | #! @python@/bin/python 2 | 3 | import socket 4 | import sys 5 | import pickle 6 | import re 7 | 8 | unix_socket_file = "/tmp/mini_compile_commands_unix_socket" 9 | directory = sys.argv[1] 10 | command = sys.argv[2::] 11 | 12 | c_file_regex = re.compile(r'.*\.cc$|.*\.c$|.*\.cpp$|.*\.cxx$') 13 | c_files = [ word for word in command if c_file_regex.search(word) ] 14 | compile_commands = [] 15 | 16 | for c_file in c_files: 17 | compile_commands.append( 18 | { 'directory' : directory, 19 | 'arguments' : command, 20 | 'file' : c_file 21 | } 22 | ) 23 | 24 | with socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) as client: 25 | try: 26 | client.connect(unix_socket_file) 27 | 28 | for i in range(3): 29 | client.send(pickle.dumps(compile_commands)) 30 | 31 | client.close() 32 | 33 | except FileNotFoundError: 34 | print("Error: can't find {}. Is mini_compile_commands_server.py running?" 35 | .format(unix_socket_file)) 36 | -------------------------------------------------------------------------------- /mini_compile_commands_server.py: -------------------------------------------------------------------------------- 1 | #! @python@/bin/python 2 | 3 | from socketserver import UnixStreamServer, StreamRequestHandler 4 | from time import localtime, strftime 5 | import signal 6 | import os 7 | import sys 8 | import pickle 9 | import json 10 | 11 | if len(sys.argv) == 1: 12 | compile_commands_output = "compile_commands.json" 13 | 14 | elif len(sys.argv) == 2: 15 | compile_commands_output = sys.argv[1] 16 | 17 | elif len(sys.argv) > 2: 18 | print("usage: mini_compile_commands_client.py compile_commands.json") 19 | sys.exit(1) 20 | 21 | unix_socket_file = "/tmp/mini_compile_commands_unix_socket" 22 | 23 | def log_message(*args, **kwargs): 24 | print( 25 | '[' + strftime('%H:%M:%S', localtime()) + ']', 26 | *args, **kwargs) 27 | 28 | class Handler(StreamRequestHandler): 29 | def handle(self): 30 | compile_commands_binary = self.rfile.read() 31 | compile_commands = pickle.loads(compile_commands_binary) 32 | log_message("recived {} compile commands".format(len(compile_commands))) 33 | self.server.compile_commands.extend(compile_commands) 34 | 35 | class Server(UnixStreamServer): 36 | 37 | def __init__(self, server_address, RequestHandlerClass): 38 | try: 39 | super().__init__(server_address, RequestHandlerClass) 40 | except: 41 | raise Exception( 42 | f''' 43 | Failed to initialize the server. This is most likely happening 44 | because the unix socket file already exists. Either 45 | 1. mini_compile_commands_server.py shut down abnormally at some point 46 | 2. there is already a mini_compile_commands_server.py instance running 47 | Remove {unix_socket_file} and try again 48 | ''' 49 | ) 50 | self.compile_commands = [] 51 | 52 | def server_close(self): 53 | with open(compile_commands_output, 'w') as f: 54 | f.write(json.dumps(self.compile_commands, indent=4)) 55 | f.write('\n') 56 | 57 | super().server_close() 58 | 59 | server = Server(unix_socket_file, Handler) 60 | print("awaiting compile commands...") 61 | 62 | def signal_handler(sig, frame): 63 | print('') 64 | server.server_close() 65 | os.remove(unix_socket_file) 66 | sys.exit(0) 67 | 68 | signal.signal(signal.SIGINT, signal_handler) 69 | 70 | server.serve_forever() 71 | -------------------------------------------------------------------------------- /tests/build/hook.nix: -------------------------------------------------------------------------------- 1 | with import ( builtins.fetchTarball { 2 | url = "https://github.com/NixOS/nixpkgs/archive/refs/heads/release-24.11.tar.gz"; 3 | }) {}; 4 | let mcc-env = (callPackage ../.. {}).wrap stdenv; 5 | mcc-hook = (callPackage ../.. {}).hook; 6 | in (hello.override { stdenv = mcc-env; }).overrideAttrs 7 | (finalAttrs: previousAttrs: { 8 | buildInputs = (previousAttrs.buildInputs or []) ++ [ mcc-hook ]; 9 | }) 10 | -------------------------------------------------------------------------------- /tests/clang/shell.nix: -------------------------------------------------------------------------------- 1 | with import ( builtins.fetchTarball { 2 | url = "https://github.com/NixOS/nixpkgs/archive/refs/heads/release-24.11.tar.gz"; 3 | }) {}; 4 | let mcc-env = (callPackage ../.. {}).wrap clangStdenv; 5 | in (mkShell.override {stdenv = mcc-env;}) { 6 | shellHook = '' 7 | mini_compile_commands_server.py & 8 | sleep 1 # give the server some time to start up 9 | $CXX test.cc -o /dev/null 10 | kill -s SIGINT $! 11 | ''; 12 | } 13 | -------------------------------------------------------------------------------- /tests/clang/test.cc: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() { 4 | std::cout << "mini_compile_commands test\n"; 5 | } 6 | -------------------------------------------------------------------------------- /tests/gcc/shell.nix: -------------------------------------------------------------------------------- 1 | with import ( builtins.fetchTarball { 2 | url = "https://github.com/NixOS/nixpkgs/archive/refs/heads/release-24.11.tar.gz"; 3 | }) {}; 4 | let mcc-env = (callPackage ../.. {}).wrap stdenv; 5 | in (mkShell.override {stdenv = mcc-env;}) { 6 | buildInputs = [ clang ]; # bring clangd into env 7 | shellHook = '' 8 | mini_compile_commands_server.py & 9 | sleep 1 # give the server some time to start up 10 | $CXX test.cc -o /dev/null 11 | kill -s SIGINT $! 12 | ''; 13 | } 14 | -------------------------------------------------------------------------------- /tests/gcc/test.cc: -------------------------------------------------------------------------------- 1 | #include 2 | 3 | int main() { 4 | std::cout << "mini_compile_commands test\n"; 5 | } 6 | --------------------------------------------------------------------------------