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dnl Process this file with autoconf to produce a configure script.
 
dnl ====================================================================
 
dnl
 
dnl     configure.in
 
dnl
 
dnl     Top-level configure script for eCos software.
 
dnl
 
dnl ====================================================================
 
dnl ####ECOSHOSTGPLCOPYRIGHTBEGIN####
 
dnl ----------------------------------------------------------------------------
 
dnl Copyright (C) 2002, 2003 Bart Veer
 
dnl Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
 
dnl
 
dnl This file is part of the eCos host tools.
 
dnl
 
dnl This program is free software; you can redistribute it and/or modify it
 
dnl under the terms of the GNU General Public License as published by the Free
 
dnl Software Foundation; either version 2 of the License, or (at your option)
 
dnl any later version.
 
dnl
 
dnl This program is distributed in the hope that it will be useful, but WITHOUT
 
dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
dnl FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 
dnl more details.
 
dnl
 
dnl You should have received a copy of the GNU General Public License along with
 
dnl this program; if not, write to the Free Software Foundation, Inc.,
 
dnl 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
dnl ----------------------------------------------------------------------------
 
dnl ####ECOSHOSTGPLCOPYRIGHTEND####
 
dnl ====================================================================
 
dnl#####DESCRIPTIONBEGIN####
 
dnl
 
dnl Author(s):  bartv
 
dnl Contact(s): bartv
 
dnl Date:       1998/12/17
 
dnl Version:    0.01
 
dnl
 
dnl####DESCRIPTIONEND####
 
dnl ====================================================================
 
 
 
dnl eCos is a componentized architecture for deeply embedded systems.
 
dnl It requires a very different configuration system from typical
 
dnl autoconfiscated software such as the various GNU packages.
 
dnl
 
dnl The main eCos host-side software is autoconfiscated to some extent,
 
dnl in that the usual sequence of "configure;make;make install" will
 
dnl work under the right conditions. However it does not conform to
 
dnl the GNU coding standards in numerous ways, for example "make dist"
 
dnl will not work. The main eCos host-side software lives in the
 
dnl "host" subdirectory, and is built unconditionally.
 
dnl
 
dnl The eCos target-side software lives in the "packages" subdirectory,
 
dnl and is organized in numerous subdirectories corresponding to different
 
dnl packages and potentially different versions of each package. In the
 
dnl master repository managed by CVS there will only be one version of
 
dnl each package, "current", which simplifies things somewhat. Other
 
dnl repositories will not be quite so straightforward and require a
 
dnl suitable administration tool.
 
dnl
 
dnl The various eCos packages are not currently auto-confiscated.
 
dnl In particular building eCos requires the use of eCos configuration
 
dnl technology, not autoconf - there is simply no good way of handling
 
dnl a system as highly configurable as eCos using a few command-line
 
dnl options passed to "configure". There would also be serious confusion
 
dnl between host and target, especially when e.g. cross-compiling the
 
dnl host tools. However a possible future enhancement
 
dnl would involve making eCos releases via configure and make, thus
 
dnl allowing for a release process that combines building the various
 
dnl host-side tools such as gcc with creating eCos epk's for the various
 
dnl packages.
 
dnl
 
dnl A complication is that some of the eCos target-side packages also
 
dnl contain package-specific host-side support. For example the
 
dnl Linux synthetic target support uses special host-side software
 
dnl to provide I/O facilities: the architectural HAL package provdes
 
dnl generic support, the synthetic ethernet package extends this
 
dnl with ethernet support, and so on. Such package-specific host-side
 
dnl software does not belong in the main host subdirectory, that
 
dnl would make it very difficult to distribute new packages or
 
dnl new versions of a package. However keeping the code with the
 
dnl various packages makes building more complicated.
 
dnl
 
dnl   1) if the entire repository is managed by CVS or anoncvs, this
 
dnl      configure script will search the packages tree for any packages
 
dnl      that have host-side software that needs to be built -
 
dnl      specifically, that have a file "configure" inside a "host"
 
dnl      subdirectory in a version of a package.
 
dnl
 
dnl   2) if instead the repository contains additional packages
 
dnl      installed as epk's and managed by an administration tool then
 
dnl      it is the responsibility of that tool to let the users build
 
dnl      and rebuild the host-side software as required, for whichever
 
dnl      host platform or platforms are being used. In other words
 
dnl      it is the responsibility of the admin tool to create a
 
dnl      suitable build directory and run "configure; make; make install",
 
dnl      usually as part of the installation process. Note that several
 
dnl      versions of a package may be installed, and it is the
 
dnl      responsibility of each package to take this into account
 
dnl      (although the configure macros are aware of this to some extent,
 
dnl      and will e.g. generate suitable install directory names).
 
dnl      Also note that the top-level configure script will not pick
 
dnl      up such packages because they will be versioned, i.e. the
 
dnl      test for current/host/configure will fail because the
 
dnl      version will not be "current".
 
dnl
 
dnl   3) as a special case it may be desirable to ship pre-built binaries
 
dnl      of some of the package-specific software. It is not clear
 
dnl      just what would be the best way of shipping these - putting
 
dnl      them into the epk's would not be quite right because that would
 
dnl      make the epk's host-specific rather than generic.
 
dnl
 
dnl There is an unresolved problem with possible dependencies between
 
dnl packages, if e.g. the host-side of the synthetic ethernet package could
 
dnl only be built after the architectural synthetic target package.
 
 
 
dnl Some of the eCos documentation is generic and lives in the "doc"
 
dnl subdirectory. Other eCos documentation is package-specific and lives
 
dnl in the appropriate package directory. At present there is no support
 
dnl for building the documentation via configure and make, but such
 
dnl support may be added in future.
 
dnl
 
dnl There is a subdirectory acsupport containing various files such
 
dnl as config.guess and install.sh that are common. This also contains
 
dnl an acinclude.m4 file with various macros that are useful for
 
dnl eCos.
 
 
 
dnl Generic initialization.
 
AC_INIT(acsupport/config.guess)
 
AC_CONFIG_AUX_DIR(acsupport)
 
AC_CANONICAL_HOST
 
AM_INIT_AUTOMAKE(eCos,2.0,0)
 
AM_MAINTAINER_MODE
 
ECOS_CHECK_BUILD_ne_SRC
 
 
 
dnl Nothing actually gets built in this directory, so there should be no
 
dnl need to worry about compiler flags etc. Instead, the problem is
 
dnl figuring out what should actually get built.
 
dnl
 
dnl  1) the host subdirectory should always get built, if it exists.
 
dnl     With the 2.0 release system the directory gets moved to
 
dnl     tools/src
 
 
 
if test -f "${srcdir}/host/configure" ; then
 
   SUBDIRS="host"
 
elif test -f "${srcdir}/tools/src/configure" ; then
 
   SUBDIRS="tools/src"
 
else
 
   SUBDIRS=""
 
fi
 
 
 
dnl  2) any package which has a configure script in a
 
dnl     current/host subdirectory should also get built.
 
dnl
 
dnl     Searching the directory tree is currently done by shell globbing.
 
dnl     Invoking "find" with suitable arguments might be quicker, but
 
dnl     less portable. On some hosts there may be problems with environmental
 
dnl     limits if too many packages provide host-side software.
 
dnl
 
dnl     Currently there is no ordering of packages, so e.g. a device
 
dnl     driver's host-side support cannot depend on some HAL package
 
dnl     because the latter may not have been built and installed yet.
 
dnl     This is a good thing because packages are meant to be self-contained
 
dnl     whenever possible. Interaction between packages is typically handled
 
dnl     at the Tcl level at run-time, so there are no build-time complications.
 
 
 
PKGHOSTDIRS=""
 
FOUND_CONFIGURES=""
 
FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/host/configure"
 
FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/host/configure"
 
FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/host/configure"
 
FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/*/host/configure"
 
FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/*/*/host/configure"
 
for configure in ${FOUND_CONFIGURES}; do
 
    if test -f ${configure}; then
 
        dnl A configure script has been found in the source tree.
 
        dnl First turn it into a directory, then replace the absolute path
 
        dnl with a relative one.
 
        hostdir=`dirname ${configure}`
 
        hostdir=`echo ${hostdir} | sed -e "s:^${srcdir}/::"`
 
        PKGHOSTDIRS="${PKGHOSTDIRS} ${hostdir}"
 
    fi
 
done
 
 
 
SUBDIRS="${SUBDIRS} ${PKGHOSTDIRS}"
 
 
 
dnl Because the eCos directory layout does not conform to GNU conventions
 
dnl it is necessary to create various levels of intermediate directories.
 
dnl This happens via config.status, prior to the recursion into the
 
dnl appropriate directories.
 
AC_OUTPUT_COMMANDS([${CONFIG_SHELL-/bin/sh} ${top_srcdir}/acsupport/mkinstalldirs ${REQUIRED_DIRS}],REQUIRED_DIRS="${SUBDIRS}")
 
 
 
AC_SUBST(SUBDIRS)
 
AC_CONFIG_SUBDIRS(${SUBDIRS})
 
AC_OUTPUT(Makefile)

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