1 dnl acinclude.m4 -- Extra macros needed for GNU make.
3 dnl Automake will incorporate this into its generated aclocal.m4.
5 dnl ---------------------------------------------------------------------------
6 dnl Got this from the lynx 2.8 distribution.
7 dnl by T.E.Dickey <dickey@clark.net>
8 dnl and Jim Spath <jspath@mail.bcpl.lib.md.us>
9 dnl and Philippe De Muyter <phdm@macqel.be>
11 dnl Created: 1997/1/28
12 dnl Updated: 1997/12/23
13 dnl ---------------------------------------------------------------------------
14 dnl After checking for functions in the default $LIBS, make a further check
15 dnl for the functions that are netlib-related (these aren't always in the
16 dnl libc, etc., and have to be handled specially because there are conflicting
17 dnl and broken implementations.
18 dnl Common library requirements (in order):
19 dnl -lresolv -lsocket -lnsl
23 AC_DEFUN([CF_NETLIBS],[
25 AC_MSG_CHECKING(for network libraries)
26 AC_CACHE_VAL(cf_cv_netlibs,[
27 AC_MSG_RESULT(working...)
30 AC_CHECK_FUNCS(gethostname,,[
31 CF_RECHECK_FUNC(gethostname,nsl,cf_cv_netlibs,[
32 CF_RECHECK_FUNC(gethostname,socket,cf_cv_netlibs)])])
34 # FIXME: sequent needs this library (i.e., -lsocket -linet -lnsl), but
35 # I don't know the entrypoints - 97/7/22 TD
36 AC_CHECK_LIB(inet,main,cf_cv_netlibs="-linet $cf_cv_netlibs")
38 if test "$ac_cv_func_lsocket" != no ; then
39 AC_CHECK_FUNCS(socket,,[
40 CF_RECHECK_FUNC(socket,socket,cf_cv_netlibs,[
41 CF_RECHECK_FUNC(socket,bsd,cf_cv_netlibs)])])
44 AC_CHECK_FUNCS(gethostbyname,,[
45 CF_RECHECK_FUNC(gethostbyname,nsl,cf_cv_netlibs)])
47 AC_CHECK_FUNCS(strcasecmp,,[
48 CF_RECHECK_FUNC(strcasecmp,resolv,cf_cv_netlibs)])
50 LIBS="$LIBS $cf_cv_netlibs"
51 test $cf_test_netlibs = no && echo "$cf_cv_netlibs" >&AC_FD_MSG
53 dnl ---------------------------------------------------------------------------
54 dnl Re-check on a function to see if we can pick it up by adding a library.
55 dnl $1 = function to check
56 dnl $2 = library to check in
57 dnl $3 = environment to update (e.g., $LIBS)
58 dnl $4 = what to do if this fails
60 dnl This uses 'unset' if the shell happens to support it, but leaves the
61 dnl configuration variable set to 'unknown' if not. This is a little better
62 dnl than the normal autoconf test, which gives misleading results if a test
63 dnl for the function is made (e.g., with AC_CHECK_FUNC) after this macro is
64 dnl used (autoconf does not distinguish between a null token and one that is
66 AC_DEFUN([CF_RECHECK_FUNC],[
68 CF_UPPER(cf_tr_func,$1)
69 AC_DEFINE_UNQUOTED(HAVE_$cf_tr_func,1,[Define if you have function $1])
73 unset ac_cv_func_$1 2>/dev/null
77 dnl ---------------------------------------------------------------------------
78 dnl Make an uppercase version of a variable
83 $1=`echo $2 | tr '[a-z]' '[A-Z]'`
88 dnl ---------------------------------------------------------------------------
89 dnl From Paul Eggert <eggert@twinsun.com>
91 AC_DEFUN(AC_STRUCT_ST_MTIM_NSEC,
92 [AC_CACHE_CHECK([for nanoseconds field of struct stat.st_mtim],
93 ac_cv_struct_st_mtim_nsec,
94 [ac_save_CPPFLAGS="$CPPFLAGS"
95 ac_cv_struct_st_mtim_nsec=no
96 # tv_nsec -- the usual case
97 # _tv_nsec -- Solaris 2.6, if
98 # (defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
99 # && !defined __EXTENSIONS__)
100 # st__tim.tv_nsec -- UnixWare 2.1.2
101 for ac_val in tv_nsec _tv_nsec st__tim.tv_nsec; do
102 CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
103 AC_TRY_COMPILE([#include <sys/types.h>
104 #include <sys/stat.h>], [struct stat s; s.st_mtim.ST_MTIM_NSEC;],
105 [ac_cv_struct_st_mtim_nsec=$ac_val; break])
107 CPPFLAGS="$ac_save_CPPFLAGS"])
109 if test $ac_cv_struct_st_mtim_nsec != no; then
110 AC_DEFINE_UNQUOTED(ST_MTIM_NSEC, $ac_cv_struct_st_mtim_nsec, [Define if 'struct stat' contains a nanoseconds field])
116 dnl ---------------------------------------------------------------------------
117 dnl This will be in the next version of autoconf; take this out then!
119 # make_FUNC_SETVBUF_REVERSED
120 # ------------------------
121 AC_DEFUN([make_FUNC_SETVBUF_REVERSED],
122 [AC_REQUIRE([AC_C_PROTOTYPES])dnl
123 AC_CACHE_CHECK(whether setvbuf arguments are reversed,
124 ac_cv_func_setvbuf_reversed,
125 [ac_cv_func_setvbuf_reversed=no
130 int (setvbuf) (FILE *, int, char *, size_t);
132 [[char buf; return setvbuf (stdout, _IOLBF, &buf, 1);]])],
137 int (setvbuf) (FILE *, int, char *, size_t);
139 [[char buf; return setvbuf (stdout, &buf, _IOLBF, 1);]])],
140 [# It compiles and links either way, so it must not be declared
141 # with a prototype and most likely this is a K&R C compiler.
145 [[#include <stdio.h>]],
146 [[/* This call has the arguments reversed.
147 A reversed system may check and see that the address of buf
148 is not _IOLBF, _IONBF, or _IOFBF, and return nonzero. */
150 if (setvbuf (stdout, _IOLBF, &buf, 1) != 0)
153 exit (0); /* Non-reversed systems SEGV here. */]])],
154 ac_cv_func_setvbuf_reversed=yes,
155 rm -f core core.* *.core,
156 [[: # Assume setvbuf is not reversed when cross-compiling.]])]
157 ac_cv_func_setvbuf_reversed=yes)])])
158 if test $ac_cv_func_setvbuf_reversed = yes; then
159 AC_DEFINE(SETVBUF_REVERSED, 1,
160 [Define to 1 if the `setvbuf' function takes the buffering type as
161 its second argument and the buffer pointer as the third, as on
162 System V before release 3.])
164 ])# make_FUNC_SETVBUF_REVERSED