1 #!/bin/sh
2 #
3 # Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 #
5 # Permission to use, copy, modify, and distribute this software for any
6 # purpose with or without fee is hereby granted, provided that the above
7 # copyright notice and this permission notice appear in all copies.
8 #
9 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 
17 # adapted from mandoc configure and oconfigure, thanks schwarze@ and
18 # kristaps@!
19 
20 set -e
21 
22 [ -w config.log ] && mv config.log config.log.old
23 [ -w config.h   ] && mv config.h   config.h.old
24 
25 # Output file descriptor usage:
26 # 1 (stdout): config.h, Makefile.local
27 # 2 (stderr): original stderr, usually to the console
28 # 3: config.log
29 
30 exec 3> config.log
31 echo "file config.log: writing..."
32 
33 # --------
34 # default settings: initialize all vars here
35 
36 CC=cc
37 CFLAGS=
38 LDFLAGS=-ltls
39 YACC=yacc
40 LEX=lex
41 STATIC=
42 
43 HAVE_ERR=
44 HAVE_GETPROGNAME=
45 HAVE_LIBTLS=
46 HAVE_STRLCAT=
47 HAVE_STRLCPY=
48 HAVE_VASPRINTF=
49 
50 NEED_GNU_SOURCE=0
51 NEED_OPENBSD_SOURCE=0
52 
53 PREFIX="/usr/local"
54 BINDIR=
55 
56 INSTALL="install"
57 
58 # try to auto detect CFLAGS and LDFLAGS
59 if which pkg-config 2>/dev/null 1>&2 && pkg-config libtls; then
60 	CFLAGS=`pkg-config --cflags libtls`
61 	LDFLAGS=`pkg-config --libs  libtls`
62 fi
63 
64 # auto detect lex/flex
65 which ${LEX} 2>/dev/null 1>&2 || {
66 	echo "${LEX} not found: trying flex" 1>&2
67 	echo "${LEX} not found: trying flex" 1>&3
68 	LEX=flex
69 	which ${LEX} 2>/dev/null 1>&2 || {
70 		echo "${LEX} not found: giving up" 1>&2
71 		echo "${LEX} not found: giving up" 1>&3
72 		exit 1
73 	}
74 }
75 
76 # auto detect yacc/bison
77 which ${YACC} 2>/dev/null 1>&2 || {
78 	echo "${YACC} not found: trying bison" 1>&2
79 	echo "${YACC} not found: trying bison" 1>&3
80 	YACC=bison
81 	which ${YACC} 2>/dev/null 1>&2 || {
82 		echo "${YACC} not found: giving up" 1>&2
83 		echo "${YACC} not found: giving up" 1>&3
84 		exit 1
85 	}
86 }
87 
88 # --------
89 # allow certain variables to be overridden on the command line
90 
91 for keyvals in "$@"; do
92 	key=`echo $keyvals | cut -s -d '=' -f1`
93 	if [ -z "$key" ]; then
94 		echo "$0: invalid key-value: $keyvals" 1>&2
95 		exit 1
96 	fi
97 	val=`echo $keyvals | cut -d '=' -f 2-`
98 	case "$key" in
99 		BINDIR)  BINDIR="$val" ;;
100 		CC)      CC="$val" ;;
101 		CFLAGS)  CFLAGS="$val" ;;
102 		DESTDIR) DESTDIR="$val" ;;
103 		LDFLAGS) LDFLAGS="$val" ;;
104 		LEX)     LEX="$lex" ;;
105 		PREFIX)  PREFIX="$val" ;;
106 		YACC)    YACC="$val" ;;
107 		*)
108 			echo "$0: invalid key: $key" 1>&2
109 			exit 1
110 	esac
111 done
112 
113 # --------
114 # tests functions
115 
116 # Check whether this HAVE_ setting is manually overridden.
117 # If yes, use the override, if no, do not decide anything yet.
118 # Arguments: test file name, test var name, manual value
119 ismanual() {
120 	[ -z "${3}" ] && return 1
121 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
122 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
123 	echo 1>&3
124 	return 0
125 }
126 
127 # Run a single autoconfiguration test.
128 # In case of success, enable the feature.
129 # In case of failure, do not decide anything yet.
130 # Arguments: test file name, test var name, additional CFLAGS
131 singletest() {
132 	n=${1}${3}
133 	cat 1>&3 << __HEREDOC__
134 testing ${n} ...
135 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
136 __HEREDOC__
137 
138 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
139 	then
140 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
141 	else
142 		echo "tested ${n}: no (compilation failed)" 1>&2
143 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
144 		echo "result of compiling ${n}: no" 1>&3
145 		echo 1>&3
146 		return 1
147 	fi
148 
149 	if ./have/${1} 1>&3 2>&3; then
150 		echo "tested ${n}: yes" 1>&2
151 		echo "result of running ${n}: yes" 1>&3
152 		echo 1>&3
153 		eval HAVE_${2}=1
154 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
155 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
156 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
157 		rm "have/${1}"
158 		return 0
159 	else
160 		echo "tested ${n}: no (execution failed)" 1>&2
161 		echo "result of ${n}: execution failed with exit status $?" 1>&3
162 		echo "result of running ${n}: no" 1>&3
163 		echo 1>&3
164 		rm "have/${1}"
165 		return 1
166 	fi
167 }
168 
169 # Run a complete autoconfiguration test, including the check for
170 # a manual override and disabling the feature on failure.
171 # Arguments: test file name, test var name, additional CFLAGS
172 # The final argument can optionally be repeated a second time.
173 runtest() {
174 	eval _manual=\${HAVE_${2}}
175 	ismanual "${1}" "${2}" "${_manual}" && return 0
176 	singletest "${1}" "${2}" "${3}" && return 0
177 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
178 	eval HAVE_${2}=0
179 	return 1
180 }
181 
182 # --------
183 # compiler options
184 
185 DEFCFLAGS="-g -W -Wall -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings -Wno-unused-parameter"
186 
187 if [ -n "${CFLAGS}" ]; then
188 	COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
189 else
190 	COMP="${CC} ${CDEFCFLAGS} -Wno-unused -Werror"
191 fi
192 echo -n "testing ${CC} -W: " 1>&2
193 echo -n "testing ${CC} -W: " 1>&3
194 runtest noop WFLAG || true
195 
196 if [ -n "${CFLAGS}" ]; then
197 	echo "CFLAGS specified manually:" 1>&3
198 elif [ ${HAVE_WFLAG} -eq 0 ]; then
199 	CFLAGS="-g"
200 else
201 	CFLAGS="${DEFCFLAGS}"
202 fi
203 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
204 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
205 echo 1>&3
206 
207 COMP="${CC} ${CFLAGS}"
208 [ ${HAVE_WFLAG} -eq 0 ] || COMP="${COMP} -Wno-unused -Werror"
209 
210 if [ -n "${STATIC}" ]; then
211 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
212 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
213 	echo 1>&3
214 else
215 	runtest noop STATIC -static || true
216 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
217 	echo "selected STATIC=\"${STATIC}\"" 1>&2
218 	echo "selected STATIC=\"${STATIC}\"" 1>&3
219 	echo 1>&3
220 fi
221 
222 # --------
223 # tests for config.h
224 
225 runtest err		ERR		|| true
226 runtest libtls		LIBTLS		|| true
227 runtest strlcat		STRLCAT		|| true
228 runtest strlcpy		STRLCPY		|| true
229 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
230 
231 if [ ${HAVE_LIBTLS} -eq 0 ]; then
232 	echo "FATAL: libtls not found" 1>&2
233 	echo "FATAL: libtls not found" 1>&3
234 	exit 1
235 fi
236 
237 # --------
238 # write config.h
239 
240 exec > config.h
241 
242 cat <<__HEREDOC__
243 #ifdef __cplusplus
244 #error "Do not use C++."
245 #endif
246 
247 __HEREDOC__
248 
249 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
250 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
251 
252 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
253 	&& echo "#include <sys/types.h>"
254 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
255 
256 cat <<__HEREDOC__
257 
258 #define HAVE_ERR		${HAVE_ERR}
259 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
260 #define HAVE_STRLCAT		${HAVE_STRLCAT}
261 #define HAVE_STRLCPY		${HAVE_STRLCPY}
262 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
263 
264 __HEREDOC__
265 
266 if [ ${HAVE_ERR} -eq 0 ]; then
267 	echo "extern	void	 err(int, const char*, ...);"
268 	echo "extern	void	 errx(int, const char*, ...);"
269 	echo "extern	void	 warn(const char*, ...);"
270 	echo "extern	void	 warnx(const char*, ...);"
271 	COMPAT="${COMPAT} compat/err.o"
272 fi
273 
274 if [ ${HAVE_STRLCAT} -eq 0 ]; then
275 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
276 	COMPAT="${COMPAT} compat/strlcat.o"
277 fi
278 if [ ${HAVE_STRLCPY} -eq 0 ]; then
279 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
280 	COMPAT="${COMPAT} compat/strlcpy.o"
281 fi
282 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
283 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
284 	COMPAT="${COMPAT} compat/vasprintf.o"
285 fi
286 echo "file config.h: written" 1>&2
287 echo "file config.h: written" 1>&3
288 
289 # --------
290 # tests for Makefile.local
291 
292 exec > Makefile.local
293 
294 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
295 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
296 
297 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
298 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
299 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
300 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
301 
302 cat << __HEREDOC__
303 CC		= ${CC}
304 CFLAGS		= ${CFLAGS}
305 LDFLAGS		= ${LDFLAGS}
306 YACC		= ${YACC}
307 LEX		= ${LEX}
308 COMPAT		= ${COMPAT}
309 STATIC		= ${STATIC}
310 PREFIX		= ${PREFIX}
311 BINDIR		= ${BINDIR}
312 INCLUDEDIR	= ${INCLUDEDIR}
313 INSTALL		= ${INSTALL}
314 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
315 INSTALL_LIB	= ${INSTALL_LIB}
316 INSTALL_MAN	= ${INSTALL_MAN}
317 INSTALL_DATA	= ${INSTALL_DATA}
318 __HEREDOC__
319 
320 echo "file Makefile.local: written" 1>&2
321 echo "file Makefile.local: written" 1>&3
322 
323 exit 0