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_EXPLICIT_BZERO=
45 HAVE_GETPROGNAME=
46 HAVE_LIBTLS=
47 HAVE_OPENSSL=
48 HAVE_RECALLOCARRAY=
49 HAVE_STRLCAT=
50 HAVE_STRLCPY=
51 HAVE_STRTONUM=
52 HAVE_VASPRINTF=
53 
54 NEED_GNU_SOURCE=0
55 NEED_OPENBSD_SOURCE=0
56 
57 PREFIX="/usr/local"
58 BINDIR=
59 
60 INSTALL="install"
61 
62 # try to auto detect CFLAGS and LDFLAGS
63 if which pkg-config 2>/dev/null 1>&2; then
64 	if pkg-config libtls; then
65 		CFLAGS="$(pkg-config --cflags libtls)"
66 		LDFLAGS="$(pkg-config --libs libtls)"
67 	fi
68 	if pkg-config openssl; then
69 		CFLAGS="${CFLAGS} $(pkg-config --cflags openssl)"
70 		LDFLAGS="${LDFLAGS} $(pkg-config --libs openssl)"
71 	fi
72 fi
73 
74 # auto detect lex/flex
75 which ${LEX} 2>/dev/null 1>&2 || {
76 	echo "${LEX} not found: trying flex" 1>&2
77 	echo "${LEX} not found: trying flex" 1>&3
78 	LEX=flex
79 	which ${LEX} 2>/dev/null 1>&2 || {
80 		echo "${LEX} not found: giving up" 1>&2
81 		echo "${LEX} not found: giving up" 1>&3
82 		exit 1
83 	}
84 }
85 
86 # auto detect yacc/bison
87 which ${YACC} 2>/dev/null 1>&2 || {
88 	echo "${YACC} not found: trying bison" 1>&2
89 	echo "${YACC} not found: trying bison" 1>&3
90 	YACC=bison
91 	which ${YACC} 2>/dev/null 1>&2 || {
92 		echo "${YACC} not found: giving up" 1>&2
93 		echo "${YACC} not found: giving up" 1>&3
94 		exit 1
95 	}
96 }
97 
98 # --------
99 # allow certain variables to be overridden on the command line
100 
101 for keyvals in "$@"; do
102 	key=`echo $keyvals | cut -s -d '=' -f1`
103 	if [ -z "$key" ]; then
104 		echo "$0: invalid key-value: $keyvals" 1>&2
105 		exit 1
106 	fi
107 	val=`echo $keyvals | cut -d '=' -f 2-`
108 	case "$key" in
109 		BINDIR)  BINDIR="$val" ;;
110 		CC)      CC="$val" ;;
111 		CFLAGS)  CFLAGS="$val" ;;
112 		DESTDIR) DESTDIR="$val" ;;
113 		LDFLAGS) LDFLAGS="$val" ;;
114 		LEX)     LEX="$lex" ;;
115 		PREFIX)  PREFIX="$val" ;;
116 		YACC)    YACC="$val" ;;
117 		*)
118 			echo "$0: invalid key: $key" 1>&2
119 			exit 1
120 	esac
121 done
122 
123 # --------
124 # tests functions
125 
126 # Check whether this HAVE_ setting is manually overridden.
127 # If yes, use the override, if no, do not decide anything yet.
128 # Arguments: test file name, test var name, manual value
129 ismanual() {
130 	[ -z "${3}" ] && return 1
131 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
132 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
133 	echo 1>&3
134 	return 0
135 }
136 
137 # Run a single autoconfiguration test.
138 # In case of success, enable the feature.
139 # In case of failure, do not decide anything yet.
140 # Arguments: test file name, test var name, additional CFLAGS
141 singletest() {
142 	n=${1}${3}
143 	cat 1>&3 << __HEREDOC__
144 testing ${n} ...
145 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
146 __HEREDOC__
147 
148 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
149 	then
150 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
151 	else
152 		echo "tested ${n}: no (compilation failed)" 1>&2
153 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
154 		echo "result of compiling ${n}: no" 1>&3
155 		echo 1>&3
156 		return 1
157 	fi
158 
159 	if ./have/${1} 1>&3 2>&3; then
160 		echo "tested ${n}: yes" 1>&2
161 		echo "result of running ${n}: yes" 1>&3
162 		echo 1>&3
163 		eval HAVE_${2}=1
164 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
165 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
166 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
167 		rm "have/${1}"
168 		return 0
169 	else
170 		echo "tested ${n}: no (execution failed)" 1>&2
171 		echo "result of ${n}: execution failed with exit status $?" 1>&3
172 		echo "result of running ${n}: no" 1>&3
173 		echo 1>&3
174 		rm "have/${1}"
175 		return 1
176 	fi
177 }
178 
179 # Run a complete autoconfiguration test, including the check for
180 # a manual override and disabling the feature on failure.
181 # Arguments: test file name, test var name, additional CFLAGS
182 # The final argument can optionally be repeated a second time.
183 runtest() {
184 	eval _manual=\${HAVE_${2}}
185 	ismanual "${1}" "${2}" "${_manual}" && return 0
186 	singletest "${1}" "${2}" "${3}" && return 0
187 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
188 	eval HAVE_${2}=0
189 	return 1
190 }
191 
192 # --------
193 # compiler options
194 
195 DEFCFLAGS="-g -W -Wall -Wmissing-prototypes -Wstrict-prototypes -Wwrite-strings -Wno-unused-parameter"
196 
197 if [ -n "${CFLAGS}" ]; then
198 	COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
199 else
200 	COMP="${CC} ${CDEFCFLAGS} -Wno-unused -Werror"
201 fi
202 echo -n "testing ${CC} -W: " 1>&2
203 echo -n "testing ${CC} -W: " 1>&3
204 runtest noop WFLAG || true
205 
206 if [ -n "${CFLAGS}" ]; then
207 	echo "CFLAGS specified manually:" 1>&3
208 elif [ ${HAVE_WFLAG} -eq 0 ]; then
209 	CFLAGS="-g"
210 else
211 	CFLAGS="${DEFCFLAGS}"
212 fi
213 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
214 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
215 echo 1>&3
216 
217 COMP="${CC} ${CFLAGS}"
218 [ ${HAVE_WFLAG} -eq 0 ] || COMP="${COMP} -Wno-unused -Werror"
219 
220 if [ -n "${STATIC}" ]; then
221 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
222 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
223 	echo 1>&3
224 else
225 	runtest noop STATIC -static || true
226 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
227 	echo "selected STATIC=\"${STATIC}\"" 1>&2
228 	echo "selected STATIC=\"${STATIC}\"" 1>&3
229 	echo 1>&3
230 fi
231 
232 # --------
233 # tests for config.h
234 
235 runtest err		ERR		|| true
236 runtest explicit_bzero	EXPLICIT_BZERO	|| true
237 runtest getprogname	GETPROGNAME	|| true
238 runtest libtls		LIBTLS		|| true
239 runtest openssl		OPENSSL		|| true
240 runtest recallocarray	RECALLOCARRAY	|| true
241 runtest strlcat		STRLCAT		|| true
242 runtest strlcpy		STRLCPY		|| true
243 runtest strtonum	STRTONUM	|| true
244 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
245 
246 if [ ${HAVE_LIBTLS} -eq 0 ]; then
247 	echo "FATAL: libtls not found" 1>&2
248 	echo "FATAL: libtls not found" 1>&3
249 	exit 1
250 fi
251 
252 if [ ${HAVE_OPENSSL} -eq 0 ]; then
253 	echo "FATAL: openssl not found" 1>&2
254 	echo "FATAL: openssl not found" 1>&3
255 	exit 1
256 fi
257 
258 # --------
259 # write config.h
260 
261 exec > config.h
262 
263 cat <<__HEREDOC__
264 #ifdef __cplusplus
265 #error "Do not use C++."
266 #endif
267 __HEREDOC__
268 
269 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
270 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
271 
272 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
273 	&& echo "#include <sys/types.h>"
274 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
275 
276 cat <<__HEREDOC__
277 
278 #define HAVE_ERR		${HAVE_ERR}
279 #define HAVE_EXPLICIT_BZERO	${HAVE_EXPLICIT_BZERO}
280 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
281 #define HAVE_RECALLOCARRAY	${HAVE_RECALLOCARRAY}
282 #define HAVE_STRLCAT		${HAVE_STRLCAT}
283 #define HAVE_STRLCPY		${HAVE_STRLCPY}
284 #define HAVE_STRTONUM		${HAVE_STRTONUM}
285 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
286 
287 __HEREDOC__
288 
289 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
290 
291 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
292   ${HAVE_RECALLOCARRAY} -eq 0 -o \
293   ${HAVE_STRLCAT} -eq 0 -o \
294   ${HAVE_STRLCPY} -eq 0 -o \
295   ${HAVE_STRTONUM} -eq 0 ] && echo "#include <stddef.h>"
296 
297 if [ ${HAVE_ERR} -eq 0 ]; then
298 	echo "extern	void	 err(int, const char*, ...);"
299 	echo "extern	void	 errx(int, const char*, ...);"
300 	echo "extern	void	 warn(const char*, ...);"
301 	echo "extern	void	 warnx(const char*, ...);"
302 	COMPAT="${COMPAT} compat/err.o"
303 else
304 	echo "#include <err.h>"
305 fi
306 if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
307 	echo "extern	void	 explicit_bzero(void*, size_t);"
308 	COMPAT="${COMPAT} compat/explicit_bzero.o"
309 fi
310 if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
311 	echo "extern	const char *getprogname(void);"
312 	COMPAT="${COMPAT} compat/getprogname.o"
313 fi
314 if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
315 	echo "extern	void*	 recallocarray(void*, size_t, size_t, size_t);"
316 	COMPAT="${COMPAT} compat/recallocarray.o"
317 fi
318 if [ ${HAVE_STRLCAT} -eq 0 ]; then
319 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
320 	COMPAT="${COMPAT} compat/strlcat.o"
321 fi
322 if [ ${HAVE_STRLCPY} -eq 0 ]; then
323 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
324 	COMPAT="${COMPAT} compat/strlcpy.o"
325 fi
326 if [ ${HAVE_STRTONUM} -eq 0 ]; then
327 	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
328 	COMPAT="${COMPAT} compat/strtonum.o"
329 fi
330 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
331 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
332 	COMPAT="${COMPAT} compat/vasprintf.o"
333 fi
334 echo "file config.h: written" 1>&2
335 echo "file config.h: written" 1>&3
336 
337 # --------
338 # tests for Makefile.local
339 
340 exec > Makefile.local
341 
342 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
343 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
344 
345 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
346 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
347 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
348 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
349 
350 cat << __HEREDOC__
351 CC		= ${CC}
352 CFLAGS		= ${CFLAGS}
353 LDFLAGS		= ${LDFLAGS}
354 YACC		= ${YACC}
355 LEX		= ${LEX}
356 COMPAT		= ${COMPAT}
357 STATIC		= ${STATIC}
358 PREFIX		= ${PREFIX}
359 BINDIR		= ${BINDIR}
360 INCLUDEDIR	= ${INCLUDEDIR}
361 INSTALL		= ${INSTALL}
362 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
363 INSTALL_LIB	= ${INSTALL_LIB}
364 INSTALL_MAN	= ${INSTALL_MAN}
365 INSTALL_DATA	= ${INSTALL_DATA}
366 __HEREDOC__
367 
368 echo "file Makefile.local: written" 1>&2
369 echo "file Makefile.local: written" 1>&3
370 
371 exit 0