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;;; semantic/bovine/gcc.el --- gcc querying special code for the C parser -*- lexical-binding: t -*-
;; Copyright (C) 2008-2025 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; 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:
;;
;; GCC stores things in special places. These functions will query
;; GCC, and set up the preprocessor and include paths.
(require 'semantic/dep)
(require 'cl-lib)
(defvar semantic-lex-c-preprocessor-symbol-file)
(defvar semantic-lex-c-preprocessor-symbol-map)
(declare-function semantic-c-reset-preprocessor-symbol-map "semantic/bovine/c")
;;; Code:
(defun semantic-gcc-query (gcc-cmd &rest gcc-options)
"Return program output or error code in case error happens.
GCC-CMD is the program to execute and GCC-OPTIONS are the options
to give to the program."
;; $ gcc -v
;;
(let* ((buff (get-buffer-create " *gcc-query*"))
(old-lc-messages (getenv "LC_ALL"))
(options `(,nil ,(cons buff t) ,nil ,@gcc-options))
(err 0))
(with-current-buffer buff
(erase-buffer)
(setenv "LC_ALL" "C")
(condition-case nil
(setq err (apply #'call-process gcc-cmd options))
(error ;; Some bogus directory for the first time perhaps?
(let ((default-directory (expand-file-name "~/")))
(condition-case nil
(setq err (apply #'call-process gcc-cmd options))
(error ;; gcc doesn't exist???
nil)))))
(setenv "LC_ALL" old-lc-messages)
(prog1
(if (zerop err)
(buffer-string)
err)
(kill-buffer buff)))))
;;(semantic-gcc-get-include-paths "c")
;;(semantic-gcc-get-include-paths "c++")
(defun semantic-gcc-get-include-paths (lang)
"Return include paths as gcc uses them for language LANG."
(let* ((gcc-cmd (cond
((string= lang "c") "gcc")
((string= lang "c++") "c++")
(t (if (stringp lang)
(error "Unknown lang: %s" lang)
(error "LANG=%S, should be a string" lang)))))
(gcc-output (semantic-gcc-query gcc-cmd "-v" "-E" "-x" lang null-device))
(lines (split-string gcc-output "\n"))
(include-marks 0)
(inc-mark "#include ")
(inc-mark-len (length "#include "))
inc-path)
;;(message "gcc-output=%s" gcc-output)
(dolist (line lines)
(when (> (length line) 1)
(if (= 0 include-marks)
(when (and (> (length line) inc-mark-len)
(string= inc-mark (substring line 0 inc-mark-len)))
(setq include-marks (1+ include-marks)))
(let ((chars (append line nil)))
(when (= 32 (nth 0 chars))
(let ((path (substring line 1)))
(when (and (file-accessible-directory-p path)
(file-name-absolute-p path))
(cl-pushnew (expand-file-name path) inc-path
:test #'equal))))))))
(nreverse inc-path)))
(defun semantic-cpp-defs (str)
"Convert CPP output STR into a list of cons cells with defines for C++."
(let ((lines (split-string str "\n"))
(lst nil))
(dolist (L lines)
(let ((dat (split-string L)))
(when (= (length dat) 3)
(push (cons (nth 1 dat) (nth 2 dat)) lst))))
lst))
(defun semantic-gcc-fields (str)
"Convert GCC output STR into an alist of fields."
(let ((fields nil)
(lines (split-string str "\n"))
)
(dolist (L lines)
;; For any line, what do we do with it?
(cond ((or (string-match "Configured with\\(:\\)" L)
(string-match "\\(:\\)\\s-*[^ ]*configure " L))
(let* ((parts (substring L (match-end 1)))
(opts (split-string parts " " t))
)
(dolist (O (cdr opts))
(let* ((data (split-string O "="))
(sym (intern (car data)))
(val (car (cdr data))))
(push (cons sym val) fields)
))
))
((string-match "gcc[ -][vV]ersion" L)
(let* ((vline (substring L (match-end 0)))
(parts (split-string vline " ")))
(push (cons 'version (nth 1 parts)) fields)))
((string-match "Target: " L)
(let ((parts (split-string L " ")))
(push (cons 'target (nth 1 parts)) fields)))
))
fields))
(defvar semantic-gcc-setup-data nil
"The GCC setup data.
This is setup by `semantic-gcc-setup'.
This is an alist, and should include keys of:
`version' - the version of gcc
`--host' - the host symbol (used in include directories)
`--prefix' - where GCC was installed.
It should also include other symbols GCC was compiled with.")
(defvar c++-include-path)
;;;###autoload
(defun semantic-gcc-setup ()
"Setup Semantic C/C++ parsing based on GCC output."
(interactive)
(let* ((fields (or semantic-gcc-setup-data
(semantic-gcc-fields (semantic-gcc-query "gcc" "-v"))))
(cpp-options `("-E" "-dM" "-x" "c++" ,null-device))
(query (let ((q (apply #'semantic-gcc-query "cpp" cpp-options)))
(if (stringp q)
q
;; `cpp' command in `semantic-gcc-setup' doesn't work on
;; Mac, try `gcc'.
(apply #'semantic-gcc-query "gcc" cpp-options))))
(defines (if (stringp query)
(semantic-cpp-defs query)
(message (concat "Could not query gcc for defines. "
"Maybe g++ is not installed."))
nil))
(ver (cdr (assoc 'version fields)))
(host (or (cdr (assoc 'target fields))
(cdr (assoc '--target fields))
(cdr (assoc '--host fields))))
;; (prefix (cdr (assoc '--prefix fields)))
;; gcc output supplied paths
;; FIXME: Where are `c-include-path' and `c++-include-path' used?
(c-include-path (semantic-gcc-get-include-paths "c"))
(c++-include-path (semantic-gcc-get-include-paths "c++"))
(gcc-exe (locate-file "gcc" exec-path exec-suffixes 'executable))
)
;; Remember so we don't have to call GCC twice.
(setq semantic-gcc-setup-data fields)
(when (and (not c-include-path) gcc-exe)
;; Fallback to guesses
(let* ( ;; gcc include dirs
(gcc-root (expand-file-name ".." (file-name-directory gcc-exe)))
(gcc-include (expand-file-name "include" gcc-root))
(gcc-include-c++ (expand-file-name "c++" gcc-include))
(gcc-include-c++-ver (expand-file-name ver gcc-include-c++))
(gcc-include-c++-ver-host (expand-file-name host gcc-include-c++-ver)))
(setq c-include-path
;; Replace cl-function remove-if-not.
(delq nil (mapcar (lambda (d)
(if (file-accessible-directory-p d) d))
(list "/usr/include" gcc-include))))
(setq c++-include-path
(delq nil (mapcar (lambda (d)
(if (file-accessible-directory-p d) d))
(list "/usr/include"
gcc-include
gcc-include-c++
gcc-include-c++-ver
gcc-include-c++-ver-host))))))
;;; Fix-me: I think this part might have been a misunderstanding, but I am not sure.
;; If this option is specified, try it both with and without prefix, and with and without host
;; (if (assoc '--with-gxx-include-dir fields)
;; (let ((gxx-include-dir (cdr (assoc '--with-gxx-include-dir fields))))
;; (nconc try-paths (list gxx-include-dir
;; (concat prefix gxx-include-dir)
;; (concat gxx-include-dir "/" host)
;; (concat prefix gxx-include-dir "/" host)))))
;; Now setup include paths etc
(dolist (D (semantic-gcc-get-include-paths "c"))
(semantic-add-system-include D 'c-mode))
(dolist (D (semantic-gcc-get-include-paths "c++"))
(semantic-add-system-include D 'c++-mode)
(let ((cppconfig (list (concat D "/bits/c++config.h") (concat D "/sys/cdefs.h")
(concat D "/features.h"))))
(dolist (cur cppconfig)
;; Presumably there will be only one of these files in the try-paths list...
(when (file-readable-p cur)
;; Add it to the symbol file
(if (boundp 'semantic-lex-c-preprocessor-symbol-file)
;; Add to the core macro header list
(add-to-list 'semantic-lex-c-preprocessor-symbol-file cur)
;; Setup the core macro header
(setq semantic-lex-c-preprocessor-symbol-file (list cur)))
))))
(if (not (boundp 'semantic-lex-c-preprocessor-symbol-map))
(setq semantic-lex-c-preprocessor-symbol-map nil))
(dolist (D defines)
(add-to-list 'semantic-lex-c-preprocessor-symbol-map D))
;; Needed for parsing macOS libc
(when (eq system-type 'darwin)
(add-to-list 'semantic-lex-c-preprocessor-symbol-map '("__i386__" . "")))
(when (featurep 'semantic/bovine/c)
(semantic-c-reset-preprocessor-symbol-map))
nil))
(provide 'semantic/bovine/gcc)
;; Local variables:
;; generated-autoload-file: "../loaddefs.el"
;; generated-autoload-load-name: "semantic/bovine/gcc"
;; End:
;;; semantic/bovine/gcc.el ends here
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