xref: /freebsd/contrib/libpcap/aclocal.m4 (revision e627b39baccd1ec9129690167cf5e6d860509655) 
1dnl @(#) $Header: aclocal.m4,v 1.32 96/07/23 22:55:48 leres Exp $ (LBL)
2dnl
3dnl Copyright (c) 1995, 1996
4dnl	The Regents of the University of California.  All rights reserved.
5dnl
6dnl Redistribution and use in source and binary forms, with or without
7dnl modification, are permitted provided that: (1) source code distributions
8dnl retain the above copyright notice and this paragraph in its entirety, (2)
9dnl distributions including binary code include the above copyright notice and
10dnl this paragraph in its entirety in the documentation or other materials
11dnl provided with the distribution, and (3) all advertising materials mentioning
12dnl features or use of this software display the following acknowledgement:
13dnl ``This product includes software developed by the University of California,
14dnl Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
15dnl the University nor the names of its contributors may be used to endorse
16dnl or promote products derived from this software without specific prior
17dnl written permission.
18dnl THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
19dnl WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
20dnl MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21dnl
22dnl LBL autoconf macros
23dnl
24
25dnl
26dnl Determine which compiler we're using (cc or gcc)
27dnl If using gcc, determine the version number
28dnl If using cc, require that it support ansi prototypes
29dnl If using gcc, use -O2 (otherwise use -O)
30dnl If using cc, explicitly specify /usr/local/include
31dnl
32dnl usage:
33dnl
34dnl	AC_LBL_C_INIT(copt, incls)
35dnl
36dnl results:
37dnl
38dnl	$1 (copt set)
39dnl	$2 (incls set)
40dnl	CC
41dnl	ac_cv_gcc_vers
42dnl
43AC_DEFUN(AC_LBL_C_INIT,
44    [$1=-O
45    $2=""
46    if test -z "$CC" ; then
47	    case "$target_os" in
48
49	    bsdi*)
50		    AC_CHECK_PROG(SHLICC2, shlicc2, yes, no)
51		    if test $SHLICC2 = yes ; then
52			    CC=shlicc2
53			    export CC
54		    fi
55		    ;;
56	    esac
57    fi
58    AC_PROG_CC
59    if test $ac_cv_prog_gcc = yes ; then
60	    if test "$SHLICC2" = yes ; then
61		    ac_cv_gcc_vers=2
62		    $1=-O2
63	    else
64		    AC_MSG_CHECKING(gcc version)
65		    AC_CACHE_VAL(ac_cv_gcc_vers,
66			ac_cv_gcc_vers=`$CC -v 2>&1 | \
67			    sed -n -e '$s/.* //' -e '$s/\..*//p'`)
68		    AC_MSG_RESULT($ac_cv_gcc_vers)
69		    if test $ac_cv_gcc_vers -gt 1 ; then
70			    $1=-O2
71		    fi
72	    fi
73    else
74	    AC_MSG_CHECKING(that $CC handles ansi prototypes)
75	    AC_CACHE_VAL(ac_cv_cc_ansi_prototypes,
76		AC_TRY_COMPILE(
77		    [#include <sys/types.h>],
78		    [int frob(int, char *)],
79		    ac_cv_cc_ansi_prototypes=yes,
80		    ac_cv_cc_ansi_prototypes=no))
81	    AC_MSG_RESULT($ac_cv_cc_ansi_prototypes)
82	    if test $ac_cv_cc_ansi_prototypes = no ; then
83		    case "$target_os" in
84
85		    hpux*)
86			    AC_MSG_CHECKING(for HP-UX ansi compiler ($CC -Aa -D_HPUX_SOURCE))
87			    savedcflags="$CFLAGS"
88			    CFLAGS="-Aa -D_HPUX_SOURCE $CFLAGS"
89			    AC_CACHE_VAL(ac_cv_cc_hpux_cc_aa,
90				AC_TRY_COMPILE(
91				    [#include <sys/types.h>],
92				    [int frob(int, char *)],
93				    ac_cv_cc_hpux_cc_aa=yes,
94				    ac_cv_cc_hpux_cc_aa=no))
95			    AC_MSG_RESULT($ac_cv_cc_hpux_cc_aa)
96			    if test $ac_cv_cc_hpux_cc_aa = no ; then
97				    AC_MSG_ERROR(see the INSTALL for more info)
98			    fi
99			    CFLAGS="$savedcflags"
100			    V_CCOPT="-Aa $V_CCOPT"
101			    AC_DEFINE(_HPUX_SOURCE)
102			    ;;
103
104		    sni*)
105			    AC_MSG_CHECKING(for SINIX ansi compiler ($CC -kansi))
106			    savedcflags="$CFLAGS"
107			    CFLAGS="-kansi"
108			    AC_CACHE_VAL(ac_cv_cc_sinix_kansi,
109				AC_TRY_COMPILE(
110				    [#include <sys/types.h>],
111				    [int frob(int, char *)],
112				    ac_cv_cc_sinix_kansi=yes,
113				    ac_cv_cc_sinix_kansi=no))
114			    AC_MSG_RESULT($ac_cv_cc_sinix_kansi)
115			    if test $ac_cv_cc_sinix_kansi = no ; then
116				    AC_MSG_ERROR(see the INSTALL for more info)
117			    fi
118			    CFLAGS="$savedcflags"
119			    V_CCOPT="-kansi $V_CCOPT"
120			    ;;
121
122		    *)
123			    AC_MSG_ERROR(see the INSTALL for more info)
124			    ;;
125		    esac
126	    fi
127	    $2=-I/usr/local/include
128
129	    case "$target_os" in
130
131	    irix*)
132		    V_CCOPT="$V_CCOPT -xansi -signed -g3"
133		    ;;
134
135	    osf*)
136		    V_CCOPT="$V_CCOPT -g3"
137		    ;;
138
139	    ultrix*)
140		    AC_MSG_CHECKING(that Ultrix $CC hacks const in prototypes)
141		    AC_CACHE_VAL(ac_cv_cc_const_proto,
142			AC_TRY_COMPILE(
143			    [#include <sys/types.h>],
144			    [struct a { int b; };
145			    void c(const struct a *)],
146			    ac_cv_cc_const_proto=yes,
147			    ac_cv_cc_const_proto=no))
148		    AC_MSG_RESULT($ac_cv_cc_const_proto)
149		    if test $ac_cv_cc_const_proto = no ; then
150			    AC_DEFINE(const,)
151		    fi
152		    ;;
153	    esac
154    fi
155])
156
157dnl
158dnl Use pfopen.c if available and pfopen() not in standard libraries
159dnl Require libpcap
160dnl Look for libpcap in ..
161dnl Use the installed libpcap if there is no local version
162dnl
163dnl usage:
164dnl
165dnl	AC_LBL_LIBPCAP(pcapdep, incls)
166dnl
167dnl results:
168dnl
169dnl	$1 (pcapdep set)
170dnl	$2 (incls appended)
171dnl	LIBS
172dnl
173AC_DEFUN(AC_LBL_LIBPCAP,
174    [pfopen=/usr/examples/packetfilter/pfopen.c
175    if test -f $pfopen ; then
176	    AC_CHECK_FUNCS(pfopen)
177	    if test $ac_cv_func_pfopen = "no" ; then
178		    AC_MSG_RESULT(Using $pfopen)
179		    LIBS="$LIBS $pfopen"
180	    fi
181    fi
182    AC_MSG_CHECKING(for local pcap library)
183    libpcap=FAIL
184    places=`ls .. | sed -e 's,/$,,' -e 's,^,../,' | \
185	egrep '/libpcap-[[0-9]]*\.[[0-9]]*(\.[[0-9]]*)?([[ab]][[0-9]]*)?$'`
186    for dir in ../libpcap $places libpcap ; do
187	    if test -r $dir/pcap.c ; then
188		    libpcap=$dir/libpcap.a
189		    d=$dir
190		    dnl continue and select the last one that exists
191	    fi
192    done
193    if test $libpcap = FAIL ; then
194	    AC_MSG_RESULT(not found)
195	    AC_CHECK_LIB(pcap, main, libpcap="-lpcap")
196	    if test $libpcap = FAIL ; then
197		    AC_MSG_ERROR(see the INSTALL doc for more info)
198	    fi
199    else
200	    $1=$libpcap
201	    $2="-I$d $$2"
202	    AC_MSG_RESULT($libpcap)
203    fi
204    LIBS="$libpcap $LIBS"])
205
206dnl
207dnl Define RETSIGTYPE and RETSIGVAL
208dnl
209dnl usage:
210dnl
211dnl	AC_LBL_TYPE_SIGNAL
212dnl
213dnl results:
214dnl
215dnl	RETSIGTYPE (defined)
216dnl	RETSIGVAL (defined)
217dnl
218AC_DEFUN(AC_LBL_TYPE_SIGNAL,
219    [AC_TYPE_SIGNAL
220    if test "$ac_cv_type_signal" = void ; then
221	    AC_DEFINE(RETSIGVAL,)
222    else
223	    AC_DEFINE(RETSIGVAL,(0))
224    fi
225    case "$target_os" in
226
227    irix*)
228	    AC_DEFINE(_BSD_SIGNALS)
229	    ;;
230
231    *)
232	    AC_CHECK_FUNCS(sigset)
233	    if test $ac_cv_func_sigset = yes ; then
234		    AC_DEFINE(signal, sigset)
235	    fi
236	    ;;
237    esac])
238
239dnl
240dnl If using gcc, see if fixincludes should be run
241dnl
242dnl usage:
243dnl
244dnl	AC_LBL_FIXINCLUDES
245dnl
246AC_DEFUN(AC_LBL_FIXINCLUDES,
247    [if test $ac_cv_prog_gcc = yes ; then
248	    AC_MSG_CHECKING(if fixincludes is needed)
249	    AC_CACHE_VAL(ac_cv_gcc_fixincludes,
250		AC_TRY_COMPILE(
251		    [/*
252		     * This generates a "duplicate case value" when fixincludes
253		     * has not be run.
254		     */
255#		include <sys/types.h>
256#		include <sys/time.h>
257#		include <sys/ioctl.h>
258#		ifdef HAVE_SYS_IOCCOM_H
259#		include <sys/ioccom.h>
260#		endif],
261		    [switch (0) {
262		    case _IO('A', 1):;
263		    case _IO('B', 1):;
264		    }],
265		    ac_cv_gcc_fixincludes=yes,
266		    ac_cv_gcc_fixincludes=no))
267	    AC_MSG_RESULT($ac_cv_gcc_fixincludes)
268	    if test $ac_cv_gcc_fixincludes = no ; then
269		    # Don't cache failure
270		    unset ac_cv_gcc_fixincludes
271		    AC_MSG_ERROR(see the INSTALL for more info)
272	    fi
273    fi])
274
275dnl
276dnl Check for flex, default to lex
277dnl Require flex 2.4 or higher
278dnl Check for bison, default to yacc
279dnl Default to lex/yacc if both flex and bison are not available
280dnl Define the yy prefix string if using flex and bison
281dnl
282dnl usage:
283dnl
284dnl	AC_LBL_LEX_AND_YACC(lex, yacc, yyprefix)
285dnl
286dnl results:
287dnl
288dnl	$1 (lex set)
289dnl	$2 (yacc appended)
290dnl	$3 (optional flex and bison -P prefix)
291dnl
292AC_DEFUN(AC_LBL_LEX_AND_YACC,
293    [AC_CHECK_PROGS($1, flex, lex)
294    if test "$$1" = flex ; then
295	    # The -V flag was added in 2.4
296	    AC_MSG_CHECKING(for flex 2.4 or higher)
297	    AC_CACHE_VAL(ac_cv_flex_v24,
298		if flex -V >/dev/null 2>&1; then
299			ac_cv_flex_v24=yes
300		else
301			ac_cv_flex_v24=no
302		fi)
303	    AC_MSG_RESULT($ac_cv_flex_v24)
304	    if test $ac_cv_flex_v24 = no ; then
305		    s="2.4 or higher required"
306		    AC_MSG_WARN(ignoring obsolete flex executable ($s))
307		    $1=lex
308	    fi
309    fi
310    AC_CHECK_PROGS($2, bison, yacc)
311    if test "$$2" = bison ; then
312	    $2="$$2 -y"
313    fi
314    if test "$$1" != lex -a "$$2" = yacc -o "$$1" = lex -a "$$2" != yacc ; then
315	    AC_MSG_WARN(don't have both flex and bison; reverting to lex/yacc)
316	    $1=lex
317	    $2=yacc
318    fi
319    if test "$$1" = flex -a -n "$3" ; then
320	    $1="$$1 -P$3"
321	    $2="$$2 -p $3"
322    fi])
323
324dnl
325dnl Checks to see if union wait is used with WEXITSTATUS()
326dnl
327dnl usage:
328dnl
329dnl	AC_LBL_UNION_WAIT
330dnl
331dnl results:
332dnl
333dnl	DECLWAITSTATUS (defined)
334dnl
335AC_DEFUN(AC_LBL_UNION_WAIT,
336    [AC_MSG_CHECKING(if union wait is used)
337    AC_CACHE_VAL(ac_cv_union_wait,
338	AC_TRY_COMPILE([
339    #	include <sys/types.h>
340    #	include <sys/wait.h>],
341	    [int status;
342	    u_int i = WEXITSTATUS(status);
343	    u_int j = waitpid(0, &status, 0);],
344	    ac_cv_union_wait=no,
345	    ac_cv_union_wait=yes))
346    AC_MSG_RESULT($ac_cv_union_wait)
347    if test $ac_cv_union_wait = yes ; then
348	    AC_DEFINE(DECLWAITSTATUS,union wait)
349    else
350	    AC_DEFINE(DECLWAITSTATUS,int)
351    fi])
352
353dnl
354dnl Checks to see if the sockaddr struct has the 4.4 BSD sa_len member
355dnl
356dnl usage:
357dnl
358dnl	AC_LBL_SOCKADDR_SA_LEN
359dnl
360dnl results:
361dnl
362dnl	HAVE_SOCKADDR_SA_LEN (defined)
363dnl
364AC_DEFUN(AC_LBL_SOCKADDR_SA_LEN,
365    [AC_MSG_CHECKING(if sockaddr struct has sa_len member)
366    AC_CACHE_VAL(ac_cv_sockaddr_has_sa_len,
367	AC_TRY_COMPILE([
368#	include <sys/types.h>
369#	include <sys/socket.h>],
370	[u_int i = sizeof(((struct sockaddr *)0)->sa_len)],
371	ac_cv_sockaddr_has_sa_len=yes,
372	ac_cv_sockaddr_has_sa_len=no))
373    AC_MSG_RESULT($ac_cv_sockaddr_has_sa_len)
374    if test $ac_cv_sockaddr_has_sa_len = yes ; then
375	    AC_DEFINE(HAVE_SOCKADDR_SA_LEN)
376    fi])
377
378dnl
379dnl Checks to see if -R is used
380dnl
381dnl usage:
382dnl
383dnl	AC_LBL_HAVE_RUN_PATH
384dnl
385dnl results:
386dnl
387dnl	ac_cv_have_run_path (yes or no)
388dnl
389AC_DEFUN(AC_LBL_HAVE_RUN_PATH,
390    [AC_MSG_CHECKING(for ${CC-cc} -R)
391    AC_CACHE_VAL(ac_cv_have_run_path,
392	[echo 'main(){}' > conftest.c
393	${CC-cc} -o conftest conftest.c -R/a1/b2/c3 >conftest.out 2>&1
394	if test ! -s conftest.out ; then
395		ac_cv_have_run_path=yes
396	else
397		ac_cv_have_run_path=no
398	fi
399	rm -f conftest*])
400    AC_MSG_RESULT($ac_cv_have_run_path)
401    ])
402
403dnl
404dnl Checks to see if unaligned memory accesses fail
405dnl
406dnl usage:
407dnl
408dnl	AC_LBL_UNALIGNED_ACCESS
409dnl
410dnl results:
411dnl
412dnl	LBL_ALIGN (DEFINED)
413dnl
414AC_DEFUN(AC_LBL_UNALIGNED_ACCESS,
415    [AC_MSG_CHECKING(if unaligned accesses fail)
416    AC_CACHE_VAL(ac_cv_unaligned_fail,
417	[case "$target_cpu" in
418
419	alpha|hp*|mips|sparc)
420		ac_cv_unaligned_fail=yes
421		;;
422
423	*)
424		cat >conftest.c <<EOF
425#		include <sys/types.h>
426#		include <sys/wait.h>
427#		include <stdio.h>
428		unsigned char a[[5]] = { 1, 2, 3, 4, 5 };
429		main() {
430		unsigned int i;
431		pid_t pid;
432		int status;
433		/* avoid "core dumped" message */
434		pid = fork();
435		if (pid <  0)
436			exit(2);
437		if (pid > 0) {
438			/* parent */
439			pid = waitpid(pid, &status, 0);
440			if (pid < 0)
441				exit(3);
442			exit(!WIFEXITED(status));
443		}
444		/* child */
445		i = *(unsigned int *)&a[1];
446		printf("%d\n", i);
447		exit(0);
448		}
449EOF
450		${CC-cc} -o conftest $CFLAGS $CPPFLAGS $LDFLAGS \
451		    conftest.c $LIBS >/dev/null 2>&1
452		if test ! -x conftest ; then
453			dnl failed to compile for some reason
454			ac_cv_unaligned_fail=yes
455		else
456			./conftest >conftest.out
457			if test ! -s conftest.out ; then
458				ac_cv_unaligned_fail=yes
459			else
460				ac_cv_unaligned_fail=no
461			fi
462		fi
463		rm -f conftest* core core.conftest
464		;;
465	esac])
466    AC_MSG_RESULT($ac_cv_unaligned_fail)
467    if test $ac_cv_unaligned_fail = yes ; then
468	    AC_DEFINE(LBL_ALIGN)
469    fi])
470
471dnl
472dnl If using gcc and the file .devel exists:
473dnl	Compile with -g (if supported) and -Wall
474dnl	If using gcc 2, do extra prototype checking
475dnl	If an os prototype include exists, symlink os-proto.h to it
476dnl
477dnl usage:
478dnl
479dnl	AC_LBL_DEVEL(copt)
480dnl
481dnl results:
482dnl
483dnl	$1 (copt appended)
484dnl	HAVE_OS_PROTO_H (defined)
485dnl	os-proto.h (symlinked)
486dnl
487AC_DEFUN(AC_LBL_DEVEL,
488    [rm -f os-proto.h
489    if test $ac_cv_prog_gcc = yes -a -f .devel ; then
490	    if test $ac_cv_prog_gcc_g = yes ; then
491		    $1="-g $$1"
492	    fi
493	    $1="$$1 -Wall"
494	    if test $ac_cv_gcc_vers -gt 1 ; then
495		    $1="$$1 -Wmissing-prototypes -Wstrict-prototypes"
496	    fi
497	    os=`echo $target_os | sed -e 's/\([[0-9]]\)[[0-9.]][[0-9.]]*$/\1/'`
498	    name="lbl/os-$os.h"
499	    if test -f $name ; then
500		    ln -s $name os-proto.h
501		    AC_DEFINE(HAVE_OS_PROTO_H)
502	    else
503		    AC_MSG_WARN(can't find $name)
504	    fi
505    fi])
506