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