dnl

dnl @synopsis ST_LIB_ARCHIVE([ENABLED-DEFAULT])

dnl

dnl This macro figures out what's necessary to link a program against an

dnl instance of the BSD libarchive package by Tim Kientzle.

dnl 

dnl See http://people.freebsd.org/~kientzle/libarchive/ for more info.

dnl

dnl It exports and substitutes the variables LIBARCHIVE_LIBS, LIBARCHIVE_LDFLAGS,

dnl and LIBARCHIVE_CPPFLAGS to appropriate values for the identified instance of

dnl libarchive.  The values are AC_SUBST'd, so a user could, for example, simply

dnl include @LIBARCHIVE_CPPFLAGS@ in the definition of AM_CPPFLAGS in a Makefile.am.

dnl

dnl ENABLED-DEFAULT is either "yes" or "no" and determines whether the default value

dnl is --with-libarchive or --without-libarchive.  It is not possible to specify a

dnl default directory.  More simply, any reasonable choice for a default should just

dnl go into the auto-detect list.

dnl

dnl The macro defines the symbol HAVE_LIBARCHIVE if the library is found. You

dnl should use autoheader to include a definition for this symbol in a config.h

dnl file. Sample usage in a C/C++ source is as follows:

dnl

dnl   #ifdef HAVE_LIBARCHIVE

dnl   #include <archive.h>

dnl   #endif /* HAVE_LIBARCHIVE */

dnl

dnl @category InstalledPackages

dnl @author Andre Stechert <andre@splunk.com>

dnl @version 2006-04-20

dnl @license GPLWithACException

AC_DEFUN([ST_LIB_ARCHIVE],

[

#

# Handle input from the configurer and blend with the requirements from the maintainer.

# We go through the trouble of creating a second set of variables other than the with_foo

# variables in order to be sure that error/corner cases have been cleaned up.

#

# After this statement, three trusted variable are defined.

#

# st_lib_archive_ENABLED will be either "yes" or "no".  its value determines whether

# or not we bother with the rest of the checks and whether or not we export a

# bunch of variables.

#

# st_lib_archive_LOCATION will be either "auto" or "defined".  if it is "auto", then

# we try a bunch of standard locations.  if it is "defined", then we just try the value

# provided in st_lib_archive_DIR.

#

# st_lib_archive_DIR will contain the string provided by the user, provided that it's

# actually a directory.

#

AC_MSG_CHECKING([if libarchive is wanted])

AC_ARG_WITH([libarchive],

	AS_HELP_STRING([--with-libarchive=DIR], [libarchive installation directory]),

	[if test "x$with_libarchive" = "xno" ; then

		st_lib_archive_ENABLED=no

	elif test "x$with_libarchive" = "xyes" ; then

		st_lib_archive_ENABLED=yes

		st_lib_archive_LOCATION=auto

	else

		st_lib_archive_ENABLED=yes

		st_lib_archive_LOCATION=defined

		if test -d "$with_libarchive" ; then

			st_lib_archive_DIR="$with_libarchive"

		else

			AC_MSG_ERROR([$with_libarchive is not a directory])

		fi

	fi],

	[if test "x$1" = "xno" ; then

		st_lib_archive_ENABLED=no

	elif test "x$1" = "xyes" ; then

		st_lib_archive_ENABLED=yes

	else

		st_lib_archive_ENABLED=yes

	fi])

if test "$st_lib_archive_ENABLED" = "yes" ; then

	AC_MSG_RESULT([yes])

#

# After this statement, one trusted variable is defined.

#

# st_lib_archive_LIB will be either "lib" or "lib64", depending on whether the configurer

# specified 32, 64.  The default is "lib".

#

	AC_MSG_CHECKING([whether to use lib or lib64])

	AC_ARG_WITH([libarchive-bits],

		AS_HELP_STRING([--with-libarchive-bits=32/64], [if 64, look in /lib64 on hybrid systems]),

		[if test "x$with_libarchive_bits" = "x32" ; then

			st_lib_archive_LIB=lib

		elif test "x$with_libarchive_bits" = "x64" ; then

			st_lib_archive_LIB=lib64

		else

			AC_MSG_ERROR([the argument must be either 32 or 64])

		fi],

		[st_lib_archive_LIB=lib])

	AC_MSG_RESULT($st_lib_archive_LIB)

#

# Save the environment before verifying libarchive availability

#

	st_lib_archive_SAVECPPFLAGS="$CPPFLAGS"

	st_lib_archive_SAVELDFLAGS="$LDFLAGS"

	AC_LANG_SAVE

	AC_LANG_C

	if test "x$st_lib_archive_LOCATION" = "xdefined" ; then

		CPPFLAGS="-I$st_lib_archive_DIR/include $st_lib_archive_SAVECPPFLAGS"

		LDFLAGS="-L$st_lib_archive_DIR/$st_lib_archive_LIB $st_lib_archive_SAVELDFLAGS"

		AC_CHECK_LIB(archive, archive_read_new, [st_lib_archive_found_lib=yes], [st_lib_archive_found_lib=no])

		AC_CHECK_HEADER(archive.h, [st_lib_archive_found_hdr=yes], [st_lib_archive_found_hdr=no])

		if test "x$st_lib_archive_found_lib" = "xyes" && test "x$st_lib_archive_found_hdr" = "xyes"; then

			LIBARCHIVE_CPPFLAGS="-I$dir/include"

			LIBARCHIVE_LDFLAGS="-L$dir/$st_lib_archive_LIB"

		else

			AC_MSG_ERROR([could not find libarchive in the requested location])

		fi

	else

		#

		# These are the common install directories for Linux, FreeBSD, Solaris, and Mac.

		#

		for dir in /usr /usr/local /usr/sfw /opt/csw /opt/local /sw

		do

			if test -d "$dir" ; then

				CPPFLAGS="-I$dir/include $st_lib_archive_SAVECPPFLAGS"

				LDFLAGS="-L$dir/$st_lib_archive_LIB $st_lib_archive_SAVELDFLAGS"

				AC_CHECK_LIB(archive, archive_read_new, [st_lib_archive_found_lib=yes], [st_lib_archive_found_lib=no])

				AC_CHECK_HEADER(archive.h, [st_lib_archive_found_hdr=yes], [st_lib_archive_found_hdr=no])

				if test "x$st_lib_archive_found_lib" = "xyes" && test "x$st_lib_archive_found_hdr" = "xyes"; then

					LIBARCHIVE_CPPFLAGS="-I$dir/include"

					LIBARCHIVE_LDFLAGS="-L$dir/$st_lib_archive_LIB"

					break

				fi

			fi

		done

	fi

	if test "x$st_lib_archive_found_hdr" = "xyes" && test "x$st_lib_archive_found_lib" = "xyes" ; then

		LIBARCHIVE_LIBS="-larchive"

		AC_DEFINE([HAVE_LIBARCHIVE], [1], [Defined to 1 if libarchive is available for use.])

		AC_SUBST(LIBARCHIVE_LIBS)

		AC_SUBST(LIBARCHIVE_CPPFLAGS)

		AC_SUBST(LIBARCHIVE_LDFLAGS)

	fi

#

# Restore the environment now that we're done.

#

	AC_LANG_RESTORE

	CPPFLAGS="$st_lib_archive_SAVECPPFLAGS"

	LDFLAGS="$st_lib_archive_SAVELDFLAGS"

else

	AC_MSG_RESULT([no])

fi

AM_CONDITIONAL(LIBARCHIVE, test "x$st_lib_archive_found_lib" = "xyes" && test "x$st_lib_archive_found_hdr" = "xyes")

])