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|
dnl Macros that test for specific features.
dnl This file is part of the Autoconf packaging for Ethereal.
dnl Copyright (C) 1998-2000 by Gerald Combs.
dnl
dnl $Id: acinclude.m4,v 1.18 2003/12/17 02:41:04 guy Exp $
dnl
#
# AC_WIRETAP_ADD_DASH_L
#
# Add to the variable specified as the first argument a "-L" flag for the
# directory specified as the second argument, and, on Solaris, add a
# "-R" flag for it as well.
#
# XXX - IRIX, and other OSes, may require some flag equivalent to
# "-R" here.
#
AC_DEFUN(AC_WIRETAP_ADD_DASH_L,
[$1="$$1 -L$2"
case "$host_os" in
solaris*)
$1="$$1 -R$2"
;;
esac
])
#
# AC_WIRETAP_PCAP_CHECK
#
AC_DEFUN(AC_WIRETAP_PCAP_CHECK,
[
if test -z "$pcap_dir"
then
#
# The user didn't specify a directory in which libpcap resides;
# we assume that the current library search path will work,
# but we may have to look for the header in a "pcap"
# subdirectory of "/usr/include" or "/usr/local/include",
# as some systems apparently put "pcap.h" in a "pcap"
# subdirectory, and we also check "$prefix/include".
#
# XXX - should we just add "$prefix/include" to the include
# search path?
#
AC_MSG_CHECKING(for extraneous pcap header directories)
found_pcap_dir=""
for pcap_dir in /usr/include/pcap $prefix/include /usr/local/include/pcap
do
if test -d $pcap_dir ; then
if test x$pcap_dir != x/usr/include; then
CFLAGS="$CFLAGS -I$pcap_dir"
CPPFLAGS="$CPPFLAGS -I$pcap_dir"
fi
found_pcap_dir=" $found_pcap_dir -I$pcap_dir"
break
fi
done
if test "$found_pcap_dir" != "" ; then
AC_MSG_RESULT(found --$found_pcap_dir added to CFLAGS)
else
AC_MSG_RESULT(not found)
fi
else
#
# The user specified a directory in which libpcap resides,
# so add the "include" subdirectory of that directory to
# the include file search path.
#
# XXX - if there's also a libpcap in a directory that's
# already in CFLAGS or CPPFLAGS, this won't make us find
# the version in the specified directory, as the compiler
# will search that other directory before it searches the
# specified directory.
#
CFLAGS="$CFLAGS -I$pcap_dir/include"
CPPFLAGS="$CPPFLAGS -I$pcap_dir/include"
fi
# Pcap header check
AC_CHECK_HEADERS(pcap.h)
])
#
# AC_WIRETAP_ZLIB_CHECK
#
AC_DEFUN(AC_WIRETAP_ZLIB_CHECK,
[
if test "x$zlib_dir" != "x"
then
#
# The user specified a directory in which zlib resides,
# so add the "include" subdirectory of that directory to
# the include file search path and the "lib" subdirectory
# of that directory to the library search path.
#
# XXX - if there's also a zlib in a directory that's
# already in CFLAGS, CPPFLAGS, or LDFLAGS, this won't
# make us find the version in the specified directory,
# as the compiler and/or linker will search that other
# directory before it searches the specified directory.
#
wiretap_save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -I$zlib_dir/include"
wiretap_save_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$zlib_dir/include"
wiretap_save_LIBS="$LIBS"
AC_WIRETAP_ADD_DASH_L(LIBS, $zlib_dir/lib)
fi
#
# Make sure we have "zlib.h". If we don't, it means we probably
# don't have zlib, so don't use it.
#
AC_CHECK_HEADER(zlib.h,,
[
if test "x$zlib_dir" != "x"
then
#
# The user used "--with-zlib=" to specify a directory
# containing zlib, but we didn't find the header file
# there; that either means they didn't specify the
# right directory or are confused about whether zlib
# is, in fact, installed. Report the error and give up.
#
AC_MSG_ERROR([zlib header not found in directory specified in --with-zlib])
else
if test "x$want_zlib" = "xyes"
then
#
# The user tried to force us to use the library, but we
# couldn't find the header file; report an error.
#
AC_MSG_ERROR(Header file zlib.h not found.)
else
#
# We couldn't find the header file; don't use the
# library, as it's probably not present.
#
want_zlib=no
fi
fi
])
if test "x$want_zlib" != "xno"
then
#
# Well, we at least have the zlib header file.
#
# Check for "gzgets()" in zlib, because we need it, but
# some older versions of zlib don't have it. It appears
# from the zlib ChangeLog that any released version of zlib
# with "gzgets()" should have the other routines we
# depend on, such as "gzseek()", "gztell()", and "zError()".
#
# Another reason why we require "gzgets()" is that
# some versions of zlib that didn't have it, such
# as 1.0.8, had a bug in "gzseek()" that meant that it
# doesn't work correctly on uncompressed files; this
# means we cannot use version 1.0.8. (Unfortunately,
# that's the version that comes with recent X11 source,
# and many people who install XFree86 on their Slackware
# boxes don't realize that they should configure it to
# use the native zlib rather than building and installing
# the crappy old version that comes with XFree86.)
#
# I.e., we can't just avoid using "gzgets()", as
# versions of zlib without "gzgets()" are likely to have
# a broken "gzseek()".
#
AC_CHECK_LIB(z, gzgets,
[
if test "x$zlib_dir" != "x"
then
#
# Put the "-I" and "-L" flags for zlib at
# the beginning of CFLAGS, CPPFLAGS, and
# LIBS.
#
LIBS=""
AC_WIRETAP_ADD_DASH_L(LIBS, $zlib_dir/lib)
LIBS="$LIBS -lz $wiretap_save_LIBS"
else
LIBS="-lz $LIBS"
fi
AC_DEFINE(HAVE_LIBZ, 1, [Define to use libz library])
],[
if test "x$zlib_dir" != "x"
then
#
# Restore the versions of CFLAGS, CPPFLAGS,
# and LIBS before we added the "-with-zlib="
# directory, as we didn't actually find
# zlib there, or didn't find a zlib that
# contains gzgets there.
#
CFLAGS="$wiretap_save_CFLAGS"
CPPFLAGS="$wiretap_save_CPPFLAGS"
LIBS="$wiretap_save_LIBS"
fi
want_zlib=no
])
fi
if test "x$want_zlib" != "xno"
then
#
# Well, we at least have the zlib header file and a zlib
# with "gzgets()".
#
# Now check for "gzgets()" in zlib when linking with the
# linker flags for GTK+ applications; people often grab
# XFree86 source and build and install it on their systems,
# and they appear sometimes to misconfigure XFree86 so that,
# even on systems with zlib, it assumes there is no zlib,
# so the XFree86 build process builds and installs its
# own zlib in the X11 library directory.
#
# The XFree86 zlib is an older version that lacks
# "gzgets()", and that's the zlib with which Ethereal
# gets linked, so the build of Ethereal fails.
#
ac_save_CFLAGS="$CFLAGS"
ac_save_LIBS="$LIBS"
CFLAGS="$CFLAGS $GTK_CFLAGS"
LIBS="$GTK_LIBS -lz $LIBS"
AC_MSG_CHECKING([for gzgets missing when linking with X11])
AC_TRY_LINK_FUNC(gzgets, AC_MSG_RESULT(no),
[
AC_MSG_RESULT(yes)
AC_MSG_ERROR(old zlib found when linking with X11 - get rid of old zlib.)
])
CFLAGS="$ac_save_CFLAGS"
LIBS="$ac_save_LIBS"
fi
])
|
