thttpd/aclocal.m4

dnl
dnl Improved version of AC_CHECK_LIB
dnl
dnl Thanks to John Hawkinson (jhawk@mit.edu)
dnl
dnl usage:
dnl
dnl     AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [,
dnl         ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
dnl
dnl results:
dnl
dnl     LIBS
dnl

define(AC_LBL_CHECK_LIB,
[AC_MSG_CHECKING([for $2 in -l$1])
dnl Use a cache variable name containing both the library and function name,
dnl because the test really is for library $1 defining function $2, not
dnl just for library $1.  Separate tests with the same $1 and different $2's
dnl may have different results.
ac_lib_var=`echo $1['_']$2['_']$5 | sed 'y%./+- %__p__%'`
AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var,
[ac_save_LIBS="$LIBS"
LIBS="-l$1 $5 $LIBS"
AC_TRY_LINK(dnl
ifelse([$2], [main], , dnl Avoid conflicting decl of main.
[/* Override any gcc2 internal prototype to avoid an error.  */
]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
extern "C"
#endif
])dnl
[/* We use char because int might match the return type of a gcc2
    builtin and then its argument prototype would still apply.  */
char $2();
]),
            [$2()],
            eval "ac_cv_lbl_lib_$ac_lib_var=yes",
            eval "ac_cv_lbl_lib_$ac_lib_var=no")
LIBS="$ac_save_LIBS"
])dnl
if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then
  AC_MSG_RESULT(yes)
  ifelse([$3], ,
[changequote(, )dnl
  ac_tr_lib=HAVE_LIB`echo $1 | sed -e 's/[^a-zA-Z0-9_]/_/g' \
    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
changequote([, ])dnl
  AC_DEFINE_UNQUOTED($ac_tr_lib)
  LIBS="-l$1 $LIBS"
], [$3])
else
  AC_MSG_RESULT(no)
ifelse([$4], , , [$4
])dnl
fi
])

dnl
dnl AC_LBL_LIBRARY_NET
dnl
dnl This test is for network applications that need socket() and
dnl gethostbyname() -ish functions.  Under Solaris, those applications
dnl need to link with "-lsocket -lnsl".  Under IRIX, they need to link
dnl with "-lnsl" but should *not* link with "-lsocket" because
dnl libsocket.a breaks a number of things (for instance:
dnl gethostbyname() under IRIX 5.2, and snoop sockets under most
dnl versions of IRIX).
dnl
dnl Unfortunately, many application developers are not aware of this,
dnl and mistakenly write tests that cause -lsocket to be used under
dnl IRIX.  It is also easy to write tests that cause -lnsl to be used
dnl under operating systems where neither are necessary (or useful),
dnl such as SunOS 4.1.4, which uses -lnsl for TLI.
dnl
dnl This test exists so that every application developer does not test
dnl this in a different, and subtly broken fashion.

dnl It has been argued that this test should be broken up into two
dnl seperate tests, one for the resolver libraries, and one for the
dnl libraries necessary for using Sockets API. Unfortunately, the two
dnl are carefully intertwined and allowing the autoconf user to use
dnl them independantly potentially results in unfortunate ordering
dnl dependancies -- as such, such component macros would have to
dnl carefully use indirection and be aware if the other components were
dnl executed. Since other autoconf macros do not go to this trouble,
dnl and almost no applications use sockets without the resolver, this
dnl complexity has not been implemented.
dnl
dnl The check for libresolv is in case you are attempting to link
dnl statically and happen to have a libresolv.a lying around (and no
dnl libnsl.a).
dnl
AC_DEFUN(AC_LBL_LIBRARY_NET, [
    # Most operating systems have gethostbyname() in the default searched
    # libraries (i.e. libc):
    AC_CHECK_FUNC(gethostbyname, ,
        # Some OSes (eg. Solaris) place it in libnsl:
        AC_LBL_CHECK_LIB(nsl, gethostbyname, , 
            # Some strange OSes (SINIX) have it in libsocket:
            AC_LBL_CHECK_LIB(socket, gethostbyname, ,
                # Unfortunately libsocket sometimes depends on libnsl.
                # AC_CHECK_LIB's API is essentially broken so the
                # following ugliness is necessary:
                AC_LBL_CHECK_LIB(socket, gethostbyname,
                    LIBS="-lsocket -lnsl $LIBS",
                    AC_CHECK_LIB(resolv, gethostbyname),
                    -lnsl))))
    AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, ,
        AC_LBL_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", ,
            -lnsl)))
    # DLPI needs putmsg under HPUX so test for -lstr while we're at it
    AC_CHECK_LIB(str, putmsg)
    ])

dnl
dnl Checks to see if struct tm has the BSD tm_gmtoff member
dnl
dnl usage:
dnl
dnl     AC_ACME_TM_GMTOFF
dnl
dnl results:
dnl
dnl     HAVE_TM_GMTOFF (defined)
dnl
AC_DEFUN(AC_ACME_TM_GMTOFF,
    [AC_MSG_CHECKING(if struct tm has tm_gmtoff member)
    AC_CACHE_VAL(ac_cv_acme_tm_has_tm_gmtoff,
        AC_TRY_COMPILE([
#       include <sys/types.h>
#       include <time.h>],
        [u_int i = sizeof(((struct tm *)0)->tm_gmtoff)],
        ac_cv_acme_tm_has_tm_gmtoff=yes,
        ac_cv_acme_tm_has_tm_gmtoff=no))
    AC_MSG_RESULT($ac_cv_acme_tm_has_tm_gmtoff)
    if test $ac_cv_acme_tm_has_tm_gmtoff = yes ; then
            AC_DEFINE(HAVE_TM_GMTOFF)
    fi])

dnl
dnl Checks to see if struct sockaddr_storage exists
dnl
dnl usage:
dnl
dnl     AC_ACME_SOCKADDR_STORAGE
dnl
dnl results:
dnl
dnl     HAVE_SOCKADDR_STORAGE (defined)
dnl
AC_DEFUN(AC_ACME_SOCKADDR_STORAGE,
    [AC_MSG_CHECKING(if struct sockaddr_storage exists)
    AC_CACHE_VAL(ac_cv_acme_sockaddr_storage,
        AC_TRY_COMPILE([
#       include <sys/types.h>
#       include <sys/socket.h>],
        [struct sockaddr_storage sas],
        ac_cv_acme_sockaddr_storage=yes,
        ac_cv_acme_sockaddr_storage=no))
    AC_MSG_RESULT($ac_cv_acme_sockaddr_storage)
    if test $ac_cv_acme_sockaddr_storage = yes ; then
            AC_DEFINE(HAVE_SOCKADDR_STORAGE)
    fi])

dnl
dnl Checks to see if struct sockaddr_in6 exists
dnl
dnl usage:
dnl
dnl     AC_ACME_SOCKADDR_IN6
dnl
dnl results:
dnl
dnl     HAVE_SOCKADDR_IN6 (defined)
dnl
AC_DEFUN(AC_ACME_SOCKADDR_IN6,
    [AC_MSG_CHECKING(if struct sockaddr_in6 exists)
    AC_CACHE_VAL(ac_cv_acme_sockaddr_in6,
        AC_TRY_COMPILE([
#       include <sys/types.h>
#       include <sys/socket.h>
#       include <netinet/in.h>],
        [struct sockaddr_in6 sa6],
        ac_cv_acme_sockaddr_in6=yes,
        ac_cv_acme_sockaddr_in6=no))
    AC_MSG_RESULT($ac_cv_acme_sockaddr_in6)
    if test $ac_cv_acme_sockaddr_in6 = yes ; then
            AC_DEFINE(HAVE_SOCKADDR_IN6)
    fi])
Revision:	1.1
Committed:	Mon Jun 18 21:11:56 2001 UTC (23 years ago) by root
Branch:	MAIN
CVS Tags:	mp_j, dp_j, cp_j, HEAD
Branch point for:	connpatch, dirpatch, mmapppatch
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	dnl
2			dnl Improved version of AC_CHECK_LIB
3			dnl
4			dnl Thanks to John Hawkinson (jhawk@mit.edu)
5			dnl
6			dnl usage:
7			dnl
8			dnl AC_LBL_CHECK_LIB(LIBRARY, FUNCTION [, ACTION-IF-FOUND [,
9			dnl ACTION-IF-NOT-FOUND [, OTHER-LIBRARIES]]])
10			dnl
11			dnl results:
12			dnl
13			dnl LIBS
14			dnl
15
16			define(AC_LBL_CHECK_LIB,
17			[AC_MSG_CHECKING([for $2 in -l$1])
18			dnl Use a cache variable name containing both the library and function name,
19			dnl because the test really is for library $1 defining function $2, not
20			dnl just for library $1. Separate tests with the same $1 and different $2's
21			dnl may have different results.
22			ac_lib_var=`echo $1['_']$2['_']$5 \| sed 'y%./+- %__p__%'`
23			AC_CACHE_VAL(ac_cv_lbl_lib_$ac_lib_var,
24			[ac_save_LIBS="$LIBS"
25			LIBS="-l$1 $5 $LIBS"
26			AC_TRY_LINK(dnl
27			ifelse([$2], [main], , dnl Avoid conflicting decl of main.
28			[/* Override any gcc2 internal prototype to avoid an error. */
29			]ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
30			extern "C"
31			#endif
32			])dnl
33			[/* We use char because int might match the return type of a gcc2
34			builtin and then its argument prototype would still apply. */
35			char $2();
36			]),
37			[$2()],
38			eval "ac_cv_lbl_lib_$ac_lib_var=yes",
39			eval "ac_cv_lbl_lib_$ac_lib_var=no")
40			LIBS="$ac_save_LIBS"
41			])dnl
42			if eval "test \"`echo '$ac_cv_lbl_lib_'$ac_lib_var`\" = yes"; then
43			AC_MSG_RESULT(yes)
44			ifelse([$3], ,
45			[changequote(, )dnl
46			ac_tr_lib=HAVE_LIB`echo $1 \| sed -e 's/[^a-zA-Z0-9_]/_/g' \
47			-e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
48			changequote([, ])dnl
49			AC_DEFINE_UNQUOTED($ac_tr_lib)
50			LIBS="-l$1 $LIBS"
51			], [$3])
52			else
53			AC_MSG_RESULT(no)
54			ifelse([$4], , , [$4
55			])dnl
56			fi
57			])
58
59			dnl
60			dnl AC_LBL_LIBRARY_NET
61			dnl
62			dnl This test is for network applications that need socket() and
63			dnl gethostbyname() -ish functions. Under Solaris, those applications
64			dnl need to link with "-lsocket -lnsl". Under IRIX, they need to link
65			dnl with "-lnsl" but should not link with "-lsocket" because
66			dnl libsocket.a breaks a number of things (for instance:
67			dnl gethostbyname() under IRIX 5.2, and snoop sockets under most
68			dnl versions of IRIX).
69			dnl
70			dnl Unfortunately, many application developers are not aware of this,
71			dnl and mistakenly write tests that cause -lsocket to be used under
72			dnl IRIX. It is also easy to write tests that cause -lnsl to be used
73			dnl under operating systems where neither are necessary (or useful),
74			dnl such as SunOS 4.1.4, which uses -lnsl for TLI.
75			dnl
76			dnl This test exists so that every application developer does not test
77			dnl this in a different, and subtly broken fashion.
78
79			dnl It has been argued that this test should be broken up into two
80			dnl seperate tests, one for the resolver libraries, and one for the
81			dnl libraries necessary for using Sockets API. Unfortunately, the two
82			dnl are carefully intertwined and allowing the autoconf user to use
83			dnl them independantly potentially results in unfortunate ordering
84			dnl dependancies -- as such, such component macros would have to
85			dnl carefully use indirection and be aware if the other components were
86			dnl executed. Since other autoconf macros do not go to this trouble,
87			dnl and almost no applications use sockets without the resolver, this
88			dnl complexity has not been implemented.
89			dnl
90			dnl The check for libresolv is in case you are attempting to link
91			dnl statically and happen to have a libresolv.a lying around (and no
92			dnl libnsl.a).
93			dnl
94			AC_DEFUN(AC_LBL_LIBRARY_NET, [
95			# Most operating systems have gethostbyname() in the default searched
96			# libraries (i.e. libc):
97			AC_CHECK_FUNC(gethostbyname, ,
98			# Some OSes (eg. Solaris) place it in libnsl:
99			AC_LBL_CHECK_LIB(nsl, gethostbyname, ,
100			# Some strange OSes (SINIX) have it in libsocket:
101			AC_LBL_CHECK_LIB(socket, gethostbyname, ,
102			# Unfortunately libsocket sometimes depends on libnsl.
103			# AC_CHECK_LIB's API is essentially broken so the
104			# following ugliness is necessary:
105			AC_LBL_CHECK_LIB(socket, gethostbyname,
106			LIBS="-lsocket -lnsl $LIBS",
107			AC_CHECK_LIB(resolv, gethostbyname),
108			-lnsl))))
109			AC_CHECK_FUNC(socket, , AC_CHECK_LIB(socket, socket, ,
110			AC_LBL_CHECK_LIB(socket, socket, LIBS="-lsocket -lnsl $LIBS", ,
111			-lnsl)))
112			# DLPI needs putmsg under HPUX so test for -lstr while we're at it
113			AC_CHECK_LIB(str, putmsg)
114			])
115
116			dnl
117			dnl Checks to see if struct tm has the BSD tm_gmtoff member
118			dnl
119			dnl usage:
120			dnl
121			dnl AC_ACME_TM_GMTOFF
122			dnl
123			dnl results:
124			dnl
125			dnl HAVE_TM_GMTOFF (defined)
126			dnl
127			AC_DEFUN(AC_ACME_TM_GMTOFF,
128			[AC_MSG_CHECKING(if struct tm has tm_gmtoff member)
129			AC_CACHE_VAL(ac_cv_acme_tm_has_tm_gmtoff,
130			AC_TRY_COMPILE([
131			# include <sys/types.h>
132			# include <time.h>],
133			[u_int i = sizeof(((struct tm *)0)->tm_gmtoff)],
134			ac_cv_acme_tm_has_tm_gmtoff=yes,
135			ac_cv_acme_tm_has_tm_gmtoff=no))
136			AC_MSG_RESULT($ac_cv_acme_tm_has_tm_gmtoff)
137			if test $ac_cv_acme_tm_has_tm_gmtoff = yes ; then
138			AC_DEFINE(HAVE_TM_GMTOFF)
139			fi])
140
141			dnl
142			dnl Checks to see if struct sockaddr_storage exists
143			dnl
144			dnl usage:
145			dnl
146			dnl AC_ACME_SOCKADDR_STORAGE
147			dnl
148			dnl results:
149			dnl
150			dnl HAVE_SOCKADDR_STORAGE (defined)
151			dnl
152			AC_DEFUN(AC_ACME_SOCKADDR_STORAGE,
153			[AC_MSG_CHECKING(if struct sockaddr_storage exists)
154			AC_CACHE_VAL(ac_cv_acme_sockaddr_storage,
155			AC_TRY_COMPILE([
156			# include <sys/types.h>
157			# include <sys/socket.h>],
158			[struct sockaddr_storage sas],
159			ac_cv_acme_sockaddr_storage=yes,
160			ac_cv_acme_sockaddr_storage=no))
161			AC_MSG_RESULT($ac_cv_acme_sockaddr_storage)
162			if test $ac_cv_acme_sockaddr_storage = yes ; then
163			AC_DEFINE(HAVE_SOCKADDR_STORAGE)
164			fi])
165
166			dnl
167			dnl Checks to see if struct sockaddr_in6 exists
168			dnl
169			dnl usage:
170			dnl
171			dnl AC_ACME_SOCKADDR_IN6
172			dnl
173			dnl results:
174			dnl
175			dnl HAVE_SOCKADDR_IN6 (defined)
176			dnl
177			AC_DEFUN(AC_ACME_SOCKADDR_IN6,
178			[AC_MSG_CHECKING(if struct sockaddr_in6 exists)
179			AC_CACHE_VAL(ac_cv_acme_sockaddr_in6,
180			AC_TRY_COMPILE([
181			# include <sys/types.h>
182			# include <sys/socket.h>
183			# include <netinet/in.h>],
184			[struct sockaddr_in6 sa6],
185			ac_cv_acme_sockaddr_in6=yes,
186			ac_cv_acme_sockaddr_in6=no))
187			AC_MSG_RESULT($ac_cv_acme_sockaddr_in6)
188			if test $ac_cv_acme_sockaddr_in6 = yes ; then
189			AC_DEFINE(HAVE_SOCKADDR_IN6)
190			fi])