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