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;;; flymake-cc.el --- Flymake support for GNU tools for C/C++ -*- lexical-binding: t; -*-
;; Copyright (C) 2018-2025 Free Software Foundation, Inc.
;; Author: João Távora <joaotavora@gmail.com>
;; Keywords: languages, c
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Flymake support for C/C++.
;;; Code:
(require 'cl-lib)
(defcustom flymake-cc-command 'flymake-cc-use-special-make-target
"Command used by the `flymake-cc' backend.
A list of strings, or a symbol naming a function that produces one
such list when called with no arguments in the buffer where the
variable `flymake-mode' is active.
The command should invoke a GNU-style compiler that checks the
syntax of a (Obj)C(++) program passed to it via its standard
input and prints the result on its standard output."
:type '(choice
(symbol :tag "Function")
(repeat :tag "Command(s)" string))
:version "27.1"
:group 'flymake-cc)
(defun flymake-cc--make-diagnostics (source)
"Parse GNU-compatible compilation messages in current buffer.
Return a list of Flymake diagnostic objects for the source buffer
SOURCE."
;; TODO: if you can understand it, use `compilation-mode's regexps
;; or even some of its machinery here.
;;
;; (setq-local compilation-locs
;; (make-hash-table :test 'equal :weakness 'value))
;; (compilation-parse-errors (point-min) (point-max)
;; 'gnu 'gcc-include)
;; (while (next-single-property-change 'compilation-message)
;; ...)
;;
;; For now, this works minimally well.
(cl-loop
while
(search-forward-regexp
"^\\(In file included from \\)?\\([^ :]+\\):\\([0-9]+\\)\\(?::\\([0-9]+\\)\\)?:\n?\\(.*\\): \\(.*\\)$"
nil t)
for msg = (match-string 6)
for locus = (match-string 2)
for line = (string-to-number (match-string 3))
for col = (ignore-errors (string-to-number (match-string 4)))
for source-buffer = (and (string= locus "<stdin>") source)
for type = (if (match-string 1)
:error
(save-match-data
(assoc-default
(match-string 5)
'(("error" . :error)
("note" . :note)
("warning" . :warning))
#'string-match
:error)))
for diag =
(cond (source-buffer
(pcase-let ((`(,beg . ,end)
(flymake-diag-region source-buffer line col)))
(flymake-make-diagnostic source-buffer beg end type msg)))
(t (flymake-make-diagnostic locus (cons line col) nil type msg)))
collect diag
;; If "In file included from..." matched, then move to end of that
;; line. This helps us collect the diagnostic at its .h locus,
;; too.
when (match-end 1) do (goto-char (match-end 2))))
(defun flymake-cc-use-special-make-target ()
"Command for checking a file via a CHK_SOURCES Make target."
(unless (executable-find "make") (error "Make not found"))
`("make"
"check-syntax"
,(format "CHK_SOURCES=-x %s -c -"
(cond ((derived-mode-p 'c++-mode) "c++")
(t "c")))))
(defvar-local flymake-cc--proc nil "Internal variable for `flymake-cc'.")
;; forward declare this to shoosh compiler (instead of requiring
;; flymake-proc)
;;
(defvar flymake-proc-allowed-file-name-masks)
;;;###autoload
(defun flymake-cc (report-fn &rest _args)
"Flymake backend for GNU-style C compilers.
This backend uses `flymake-cc-command' (which see) to launch a
process that is passed the current buffer's contents via stdin.
REPORT-FN is Flymake's callback."
;; HACK: XXX: Assuming this backend function is run before it in
;; `flymake-diagnostic-functions', very hackingly convince the other
;; backend `flymake-proc-legacy-flymake', which is on by default, to
;; disable itself.
;;
(setq-local flymake-proc-allowed-file-name-masks nil)
(when (process-live-p flymake-cc--proc)
(kill-process flymake-cc--proc))
(let ((source (current-buffer)))
(save-restriction
(widen)
(setq
flymake-cc--proc
(make-process
:name "gcc-flymake"
:buffer (generate-new-buffer "*gcc-flymake*")
:command (if (symbolp flymake-cc-command)
(funcall flymake-cc-command)
flymake-cc-command)
:noquery t :connection-type 'pipe
:sentinel
(lambda (p _ev)
(unwind-protect
(when (eq 'exit (process-status p))
(when (with-current-buffer source (eq p flymake-cc--proc))
(with-current-buffer (process-buffer p)
(goto-char (point-min))
(let ((diags
(flymake-cc--make-diagnostics source)))
(if (or diags (zerop (process-exit-status p)))
(funcall report-fn diags)
;; non-zero exit with no diags is cause
;; for alarm
(funcall report-fn
:panic :explanation
(buffer-substring
(point-min) (progn (goto-char (point-min))
(line-end-position)))))))))
(unless (process-live-p p)
;; (display-buffer (process-buffer p)) ; uncomment to debug
(kill-buffer (process-buffer p)))))))
(process-send-region flymake-cc--proc (point-min) (point-max))
(process-send-eof flymake-cc--proc))))
(provide 'flymake-cc)
;;; flymake-cc.el ends here
|
