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1 dnl Helper macros for Tor configure.ac
2 dnl Copyright (c) 2001-2004, Roger Dingledine
3 dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
4 dnl Copyright (c) 2007-2008, Roger Dingledine, Nick Mathewson
5 dnl Copyright (c) 2007-2019, The Tor Project, Inc.
6 dnl See LICENSE for licensing information
7
8 AC_DEFUN([TOR_EXTEND_CODEPATH],
9 [
10 if test -d "$1/lib"; then
11 LDFLAGS="-L$1/lib $LDFLAGS"
12 else
13 LDFLAGS="-L$1 $LDFLAGS"
14 fi
15 if test -d "$1/include"; then
16 CPPFLAGS="-I$1/include $CPPFLAGS"
17 else
18 CPPFLAGS="-I$1 $CPPFLAGS"
19 fi
20 ])
21
22 AC_DEFUN([TOR_DEFINE_CODEPATH],
23 [
24 if test x$1 = "x(system)"; then
25 TOR_LDFLAGS_$2=""
26 TOR_CPPFLAGS_$2=""
27 else
28 if test -d "$1/lib"; then
29 TOR_LDFLAGS_$2="-L$1/lib"
30 TOR_LIBDIR_$2="$1/lib"
31 else
32 TOR_LDFLAGS_$2="-L$1"
33 TOR_LIBDIR_$2="$1"
34 fi
35 if test -d "$1/include"; then
36 TOR_CPPFLAGS_$2="-I$1/include"
37 else
38 TOR_CPPFLAGS_$2="-I$1"
39 fi
40 fi
41 AC_SUBST(TOR_CPPFLAGS_$2)
42 AC_SUBST(TOR_LDFLAGS_$2)
43 ])
44
45 dnl 1: flags
46 dnl 2: try to link too if this is nonempty.
47 dnl 3: what to do on success compiling
48 dnl 4: what to do on failure compiling
49 AC_DEFUN([TOR_TRY_COMPILE_WITH_CFLAGS], [
50 AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
51 AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
52 tor_saved_CFLAGS="$CFLAGS"
53 CFLAGS="$CFLAGS -pedantic -Werror $1"
54 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
55 [AS_VAR_SET(VAR,yes)],
56 [AS_VAR_SET(VAR,no)])
57 if test x$2 != x; then
58 AS_VAR_PUSHDEF([can_link],[tor_can_link_$1])
59 AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
60 [AS_VAR_SET(can_link,yes)],
61 [AS_VAR_SET(can_link,no)])
62 AS_VAR_POPDEF([can_link])
63 fi
64 CFLAGS="$tor_saved_CFLAGS"
65 ])
66 if test x$VAR = xyes; then
67 $3
68 else
69 $4
70 fi
71 AS_VAR_POPDEF([VAR])
72 ])
73
74 dnl 1:flags
75 dnl 2:also try to link (yes: non-empty string)
76 dnl will set yes or no in $tor_can_link_$1 (as modified by AS_VAR_PUSHDEF)
77 AC_DEFUN([TOR_CHECK_CFLAGS], [
78 TOR_TRY_COMPILE_WITH_CFLAGS($1, $2, CFLAGS="$CFLAGS $1", true)
79 ])
80
81 dnl 1:flags
82 dnl 2:extra ldflags
83 dnl 3:extra libraries
84 AC_DEFUN([TOR_CHECK_LDFLAGS], [
85 AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
86 AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
87 tor_saved_CFLAGS="$CFLAGS"
88 tor_saved_LDFLAGS="$LDFLAGS"
89 tor_saved_LIBS="$LIBS"
90 CFLAGS="$CFLAGS -pedantic -Werror"
91 LDFLAGS="$LDFLAGS $2 $1"
92 LIBS="$LIBS $3"
93 AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
94 [AS_VAR_SET(VAR,yes)],
95 [AS_VAR_SET(VAR,no)],
96 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
97 [AS_VAR_SET(VAR,yes)],
98 [AS_VAR_SET(VAR,no)])])
99 CFLAGS="$tor_saved_CFLAGS"
100 LDFLAGS="$tor_saved_LDFLAGS"
101 LIBS="$tor_saved_LIBS"
102 ])
103 if test x$VAR = xyes; then
104 LDFLAGS="$LDFLAGS $1"
105 fi
106 AS_VAR_POPDEF([VAR])
107 ])
108
109 dnl 1:libname
110 AC_DEFUN([TOR_WARN_MISSING_LIB], [
111 h=""
112 if test x$2 = xdevpkg; then
113 h=" headers for"
114 fi
115 if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
116 AC_MSG_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
117 if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
118 AC_MSG_WARN([ You will probably need $tor_$1_devpkg_debian too.])
119 fi
120 fi
121 if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
122 AC_MSG_WARN([On Fedora, you can install$h $1 using "dnf install $tor_$1_$2_redhat"])
123 if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
124 AC_MSG_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
125 fi
126 else
127 if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
128 AC_MSG_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat RPM package])
129 if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
130 AC_MSG_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
131 fi
132 fi
133 fi
134 ])
135
136 dnl Look for a library, and its associated includes, and how to link
137 dnl against it.
138 dnl
139 dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
140 dnl 5:prototype,
141 dnl 6:code, 7:IGNORED, 8:searchextra)
142 dnl
143 dnl Special variables:
144 dnl ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
145 dnl Used to support renaming --with-ssl-dir to --with-openssl-dir
146 dnl
147 AC_DEFUN([TOR_SEARCH_LIBRARY], [
148 try$1dir=""
149 AC_ARG_WITH($1-dir,
150 AS_HELP_STRING(--with-$1-dir=PATH, [specify path to $1 installation]),
151 [
152 if test x$withval != xno ; then
153 try$1dir="$withval"
154 fi
155 ])
156 if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
157 try$1dir="$ALT_$1_WITHVAL"
158 fi
159
160 tor_saved_LIBS="$LIBS"
161 tor_saved_LDFLAGS="$LDFLAGS"
162 tor_saved_CPPFLAGS="$CPPFLAGS"
163 AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
164 tor_$1_dir_found=no
165 tor_$1_any_linkable=no
166
167 for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
168 LDFLAGS="$tor_saved_LDFLAGS"
169 LIBS="$3 $tor_saved_LIBS"
170 CPPFLAGS="$tor_saved_CPPFLAGS"
171
172 if test -z "$tor_trydir" ; then
173 continue;
174 fi
175
176 # Skip the directory if it isn't there.
177 if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
178 continue;
179 fi
180
181 # If this isn't blank, try adding the directory (or appropriate
182 # include/libs subdirectories) to the command line.
183 if test "$tor_trydir" != "(system)"; then
184 TOR_EXTEND_CODEPATH($tor_trydir)
185 fi
186
187 # Can we link against (but not necessarily run, or find the headers for)
188 # the binary?
189 AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
190 [linkable=yes], [linkable=no])
191
192 if test "$linkable" = yes; then
193 tor_$1_any_linkable=yes
194 # Okay, we can link against it. Can we find the headers?
195 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
196 [buildable=yes], [buildable=no])
197 if test "$buildable" = yes; then
198 tor_cv_library_$1_dir=$tor_trydir
199 tor_$1_dir_found=yes
200 break
201 fi
202 fi
203 done
204
205 if test "$tor_$1_dir_found" = no; then
206 if test "$tor_$1_any_linkable" = no ; then
207 AC_MSG_WARN([Could not find a linkable $1. If you have it installed somewhere unusual, you can specify an explicit path using --with-$1-dir])
208 TOR_WARN_MISSING_LIB($1, pkg)
209 AC_MSG_ERROR([Missing libraries; unable to proceed.])
210 else
211 AC_MSG_WARN([We found the libraries for $1, but we could not find the C header files. You may need to install a devel package.])
212 TOR_WARN_MISSING_LIB($1, devpkg)
213 AC_MSG_ERROR([Missing headers; unable to proceed.])
214 fi
215 fi
216
217 LDFLAGS="$tor_saved_LDFLAGS"
218 LIBS="$tor_saved_LIBS"
219 CPPFLAGS="$tor_saved_CPPFLAGS"
220 ]) dnl end cache check
221
222 LIBS="$3 $LIBS"
223 if test "$tor_cv_library_$1_dir" != "(system)"; then
224 TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
225 fi
226
227 TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
228
229 if test "$cross_compiling" != yes; then
230 AC_CACHE_CHECK([whether we need extra options to link $1],
231 tor_cv_library_$1_linker_option, [
232 orig_LDFLAGS="$LDFLAGS"
233 runs=no
234 linked_with=nothing
235 if test -d "$tor_cv_library_$1_dir/lib"; then
236 tor_trydir="$tor_cv_library_$1_dir/lib"
237 else
238 tor_trydir="$tor_cv_library_$1_dir"
239 fi
240 for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
241 "-Wl,-rpath,$tor_trydir" ; do
242 if test "$tor_tryextra" = "(none)"; then
243 LDFLAGS="$orig_LDFLAGS"
244 else
245 LDFLAGS="$tor_tryextra $orig_LDFLAGS"
246 fi
247 AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
248 [runnable=yes], [runnable=no],
249 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
250 [runnable=yes],
251 [runnable=no])])
252 if test "$runnable" = yes; then
253 tor_cv_library_$1_linker_option=$tor_tryextra
254 break
255 fi
256 done
257
258 if test "$runnable" = no; then
259 AC_MSG_ERROR([Found linkable $1 in $tor_cv_library_$1_dir, but it does not seem to run, even with -R. Maybe specify another using --with-$1-dir}])
260 fi
261 LDFLAGS="$orig_LDFLAGS"
262 ]) dnl end cache check check for extra options.
263
264 if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
265 TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
266 fi
267 fi # cross-compile
268
269 LIBS="$tor_saved_LIBS"
270 LDFLAGS="$tor_saved_LDFLAGS"
271 CPPFLAGS="$tor_saved_CPPFLAGS"
272
273 ]) dnl end defun
274
275 dnl Check whether the prototype for a function is present or missing.
276 dnl Apple has a nasty habit of putting functions in their libraries (so that
277 dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
278 dnl
279 dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
280 AC_DEFUN([TOR_CHECK_PROTOTYPE], [
281 AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
282 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
283 tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
284 if test x$tor_cv_$1_declared != xno ; then
285 AC_DEFINE($2, 1,
286 [Defined if the prototype for $1 seems to be present.])
287 fi
288 ])