1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
|
;;; semantic/bovine/gcc.el --- gcc querying special code for the C parser
;; Copyright (C) 2008-2017 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <eric@siege-engine.com>
;; 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)
(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))
(add-to-list 'inc-path
(expand-file-name path)
t))))))))
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)
(add-to-list 'lst (cons (nth 1 dat) (nth 2 dat))))))
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.")
;;;###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
|
