| 1 | dnl acinclude.m4 -- Extra macros needed for GNU make.
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| 2 | dnl
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| 3 | dnl Automake will incorporate this into its generated aclocal.m4.
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| 4 |
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| 5 | dnl ---------------------------------------------------------------------------
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| 6 | dnl Got this from the lynx 2.8 distribution.
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| 7 | dnl by T.E.Dickey <dickey@clark.net>
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| 8 | dnl and Jim Spath <jspath@mail.bcpl.lib.md.us>
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| 9 | dnl and Philippe De Muyter <phdm@macqel.be>
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| 10 | dnl
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| 11 | dnl Created: 1997/1/28
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| 12 | dnl Updated: 1997/12/23
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| 13 | dnl ---------------------------------------------------------------------------
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| 14 | dnl After checking for functions in the default $LIBS, make a further check
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| 15 | dnl for the functions that are netlib-related (these aren't always in the
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| 16 | dnl libc, etc., and have to be handled specially because there are conflicting
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| 17 | dnl and broken implementations.
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| 18 | dnl Common library requirements (in order):
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| 19 | dnl -lresolv -lsocket -lnsl
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| 20 | dnl -lnsl -lsocket
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| 21 | dnl -lsocket
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| 22 | dnl -lbsd
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| 23 | AC_DEFUN([CF_NETLIBS],[
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| 24 | cf_test_netlibs=no
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| 25 | AC_MSG_CHECKING(for network libraries)
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| 26 | AC_CACHE_VAL(cf_cv_netlibs,[
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| 27 | AC_MSG_RESULT(working...)
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| 28 | cf_cv_netlibs=""
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| 29 | cf_test_netlibs=yes
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| 30 | AC_CHECK_FUNCS(gethostname,,[
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| 31 | CF_RECHECK_FUNC(gethostname,nsl,cf_cv_netlibs,[
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| 32 | CF_RECHECK_FUNC(gethostname,socket,cf_cv_netlibs)])])
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| 33 | #
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| 34 | # FIXME: sequent needs this library (i.e., -lsocket -linet -lnsl), but
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| 35 | # I don't know the entrypoints - 97/7/22 TD
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| 36 | AC_CHECK_LIB(inet,main,cf_cv_netlibs="-linet $cf_cv_netlibs")
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| 37 | #
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| 38 | if test "$ac_cv_func_lsocket" != no ; then
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| 39 | AC_CHECK_FUNCS(socket,,[
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| 40 | CF_RECHECK_FUNC(socket,socket,cf_cv_netlibs,[
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| 41 | CF_RECHECK_FUNC(socket,bsd,cf_cv_netlibs)])])
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| 42 | fi
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| 43 | #
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| 44 | AC_CHECK_FUNCS(gethostbyname,,[
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| 45 | CF_RECHECK_FUNC(gethostbyname,nsl,cf_cv_netlibs)])
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| 46 | #
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| 47 | AC_CHECK_FUNCS(strcasecmp,,[
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| 48 | CF_RECHECK_FUNC(strcasecmp,resolv,cf_cv_netlibs)])
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| 49 | ])
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| 50 | LIBS="$LIBS $cf_cv_netlibs"
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| 51 | test $cf_test_netlibs = no && echo "$cf_cv_netlibs" >&AC_FD_MSG
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| 52 | ])dnl
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| 53 | dnl ---------------------------------------------------------------------------
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| 54 | dnl Re-check on a function to see if we can pick it up by adding a library.
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| 55 | dnl $1 = function to check
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| 56 | dnl $2 = library to check in
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| 57 | dnl $3 = environment to update (e.g., $LIBS)
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| 58 | dnl $4 = what to do if this fails
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| 59 | dnl
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| 60 | dnl This uses 'unset' if the shell happens to support it, but leaves the
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| 61 | dnl configuration variable set to 'unknown' if not. This is a little better
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| 62 | dnl than the normal autoconf test, which gives misleading results if a test
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| 63 | dnl for the function is made (e.g., with AC_CHECK_FUNC) after this macro is
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| 64 | dnl used (autoconf does not distinguish between a null token and one that is
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| 65 | dnl set to 'no').
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| 66 | AC_DEFUN([CF_RECHECK_FUNC],[
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| 67 | AC_CHECK_LIB($2,$1,[
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| 68 | CF_UPPER(cf_tr_func,$1)
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| 69 | AC_DEFINE_UNQUOTED(HAVE_$cf_tr_func,1,[Define if you have function $1])
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| 70 | ac_cv_func_$1=yes
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| 71 | $3="-l$2 [$]$3"],[
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| 72 | ac_cv_func_$1=unknown
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| 73 | unset ac_cv_func_$1 2>/dev/null
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| 74 | $4],
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| 75 | [[$]$3])
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| 76 | ])dnl
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| 77 | dnl ---------------------------------------------------------------------------
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| 78 | dnl Make an uppercase version of a variable
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| 79 | dnl $1=uppercase($2)
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| 80 | AC_DEFUN([CF_UPPER],
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| 81 | [
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| 82 | changequote(,)dnl
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| 83 | $1=`echo $2 | tr '[a-z]' '[A-Z]'`
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| 84 | changequote([,])dnl
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| 85 | ])dnl
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| 86 |
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| 87 |
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| 88 | dnl ---------------------------------------------------------------------------
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| 89 | dnl From Paul Eggert <eggert@twinsun.com>
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| 90 |
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| 91 | AC_DEFUN(AC_STRUCT_ST_MTIM_NSEC,
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| 92 | [AC_CACHE_CHECK([for nanoseconds field of struct stat.st_mtim],
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| 93 | ac_cv_struct_st_mtim_nsec,
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| 94 | [ac_save_CPPFLAGS="$CPPFLAGS"
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| 95 | ac_cv_struct_st_mtim_nsec=no
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| 96 | # tv_nsec -- the usual case
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| 97 | # _tv_nsec -- Solaris 2.6, if
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| 98 | # (defined _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED == 1
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| 99 | # && !defined __EXTENSIONS__)
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| 100 | # st__tim.tv_nsec -- UnixWare 2.1.2
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| 101 | for ac_val in tv_nsec _tv_nsec st__tim.tv_nsec; do
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| 102 | CPPFLAGS="$ac_save_CPPFLAGS -DST_MTIM_NSEC=$ac_val"
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| 103 | AC_TRY_COMPILE([#include <sys/types.h>
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| 104 | #include <sys/stat.h>], [struct stat s; s.st_mtim.ST_MTIM_NSEC;],
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| 105 | [ac_cv_struct_st_mtim_nsec=$ac_val; break])
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| 106 | done
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| 107 | CPPFLAGS="$ac_save_CPPFLAGS"])
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| 108 |
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| 109 | if test $ac_cv_struct_st_mtim_nsec != no; then
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| 110 | AC_DEFINE_UNQUOTED(ST_MTIM_NSEC, $ac_cv_struct_st_mtim_nsec, [Define if 'struct stat' contains a nanoseconds field])
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| 111 | fi
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| 112 | ]
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| 113 | )
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| 114 |
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| 115 |
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| 116 | dnl ---------------------------------------------------------------------------
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| 117 | dnl This will be in the next version of autoconf; take this out then!
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| 118 |
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| 119 | # make_FUNC_SETVBUF_REVERSED
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| 120 | # ------------------------
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| 121 | AC_DEFUN([make_FUNC_SETVBUF_REVERSED],
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| 122 | [AC_REQUIRE([AC_C_PROTOTYPES])dnl
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| 123 | AC_CACHE_CHECK(whether setvbuf arguments are reversed,
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| 124 | ac_cv_func_setvbuf_reversed,
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| 125 | [ac_cv_func_setvbuf_reversed=no
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| 126 | AC_LINK_IFELSE(
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| 127 | [AC_LANG_PROGRAM(
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| 128 | [[#include <stdio.h>
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| 129 | # if PROTOTYPES
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| 130 | int (setvbuf) (FILE *, int, char *, size_t);
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| 131 | # endif]],
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| 132 | [[char buf; return setvbuf (stdout, _IOLBF, &buf, 1);]])],
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| 133 | [AC_LINK_IFELSE(
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| 134 | [AC_LANG_PROGRAM(
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| 135 | [[#include <stdio.h>
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| 136 | # if PROTOTYPES
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| 137 | int (setvbuf) (FILE *, int, char *, size_t);
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| 138 | # endif]],
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| 139 | [[char buf; return setvbuf (stdout, &buf, _IOLBF, 1);]])],
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| 140 | [# It compiles and links either way, so it must not be declared
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| 141 | # with a prototype and most likely this is a K&R C compiler.
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| 142 | # Try running it.
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| 143 | AC_RUN_IFELSE(
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| 144 | [AC_LANG_PROGRAM(
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| 145 | [[#include <stdio.h>]],
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| 146 | [[/* This call has the arguments reversed.
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| 147 | A reversed system may check and see that the address of buf
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| 148 | is not _IOLBF, _IONBF, or _IOFBF, and return nonzero. */
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| 149 | char buf;
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| 150 | if (setvbuf (stdout, _IOLBF, &buf, 1) != 0)
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| 151 | exit (1);
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| 152 | putchar ('\r');
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| 153 | exit (0); /* Non-reversed systems SEGV here. */]])],
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| 154 | ac_cv_func_setvbuf_reversed=yes,
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| 155 | rm -f core core.* *.core,
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| 156 | [[: # Assume setvbuf is not reversed when cross-compiling.]])]
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| 157 | ac_cv_func_setvbuf_reversed=yes)])])
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| 158 | if test $ac_cv_func_setvbuf_reversed = yes; then
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| 159 | AC_DEFINE(SETVBUF_REVERSED, 1,
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| 160 | [Define to 1 if the `setvbuf' function takes the buffering type as
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| 161 | its second argument and the buffer pointer as the third, as on
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| 162 | System V before release 3.])
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| 163 | fi
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| 164 | ])# make_FUNC_SETVBUF_REVERSED
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