?rev1line? |
?rev2line? |
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dnl Process this file with autoconf to produce a configure script.
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dnl ====================================================================
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dnl
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dnl configure.in
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dnl
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dnl Top-level configure script for eCos software.
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dnl
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dnl ====================================================================
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dnl ####ECOSHOSTGPLCOPYRIGHTBEGIN####
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dnl ----------------------------------------------------------------------------
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dnl Copyright (C) 2002, 2003 Bart Veer
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dnl Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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dnl
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dnl This file is part of the eCos host tools.
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dnl
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dnl This program is free software; you can redistribute it and/or modify it
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dnl under the terms of the GNU General Public License as published by the Free
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dnl Software Foundation; either version 2 of the License, or (at your option)
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dnl any later version.
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dnl
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dnl This program is distributed in the hope that it will be useful, but WITHOUT
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dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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dnl more details.
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dnl
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dnl You should have received a copy of the GNU General Public License along with
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dnl this program; if not, write to the Free Software Foundation, Inc.,
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dnl 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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dnl ----------------------------------------------------------------------------
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dnl ####ECOSHOSTGPLCOPYRIGHTEND####
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dnl ====================================================================
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dnl#####DESCRIPTIONBEGIN####
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dnl
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dnl Author(s): bartv
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dnl Contact(s): bartv
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dnl Date: 1998/12/17
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dnl Version: 0.01
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dnl
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dnl####DESCRIPTIONEND####
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dnl ====================================================================
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dnl eCos is a componentized architecture for deeply embedded systems.
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dnl It requires a very different configuration system from typical
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dnl autoconfiscated software such as the various GNU packages.
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dnl
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dnl The main eCos host-side software is autoconfiscated to some extent,
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dnl in that the usual sequence of "configure;make;make install" will
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dnl work under the right conditions. However it does not conform to
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dnl the GNU coding standards in numerous ways, for example "make dist"
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dnl will not work. The main eCos host-side software lives in the
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dnl "host" subdirectory, and is built unconditionally.
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dnl
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dnl The eCos target-side software lives in the "packages" subdirectory,
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dnl and is organized in numerous subdirectories corresponding to different
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dnl packages and potentially different versions of each package. In the
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dnl master repository managed by CVS there will only be one version of
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dnl each package, "current", which simplifies things somewhat. Other
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dnl repositories will not be quite so straightforward and require a
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dnl suitable administration tool.
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dnl
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dnl The various eCos packages are not currently auto-confiscated.
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dnl In particular building eCos requires the use of eCos configuration
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dnl technology, not autoconf - there is simply no good way of handling
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dnl a system as highly configurable as eCos using a few command-line
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dnl options passed to "configure". There would also be serious confusion
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dnl between host and target, especially when e.g. cross-compiling the
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dnl host tools. However a possible future enhancement
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dnl would involve making eCos releases via configure and make, thus
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dnl allowing for a release process that combines building the various
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dnl host-side tools such as gcc with creating eCos epk's for the various
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dnl packages.
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dnl
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dnl A complication is that some of the eCos target-side packages also
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dnl contain package-specific host-side support. For example the
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dnl Linux synthetic target support uses special host-side software
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dnl to provide I/O facilities: the architectural HAL package provdes
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dnl generic support, the synthetic ethernet package extends this
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dnl with ethernet support, and so on. Such package-specific host-side
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dnl software does not belong in the main host subdirectory, that
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dnl would make it very difficult to distribute new packages or
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dnl new versions of a package. However keeping the code with the
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dnl various packages makes building more complicated.
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dnl
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dnl 1) if the entire repository is managed by CVS or anoncvs, this
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dnl configure script will search the packages tree for any packages
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dnl that have host-side software that needs to be built -
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dnl specifically, that have a file "configure" inside a "host"
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dnl subdirectory in a version of a package.
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dnl
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dnl 2) if instead the repository contains additional packages
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dnl installed as epk's and managed by an administration tool then
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dnl it is the responsibility of that tool to let the users build
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dnl and rebuild the host-side software as required, for whichever
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dnl host platform or platforms are being used. In other words
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dnl it is the responsibility of the admin tool to create a
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dnl suitable build directory and run "configure; make; make install",
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dnl usually as part of the installation process. Note that several
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dnl versions of a package may be installed, and it is the
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dnl responsibility of each package to take this into account
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dnl (although the configure macros are aware of this to some extent,
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dnl and will e.g. generate suitable install directory names).
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dnl Also note that the top-level configure script will not pick
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dnl up such packages because they will be versioned, i.e. the
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dnl test for current/host/configure will fail because the
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dnl version will not be "current".
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dnl
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dnl 3) as a special case it may be desirable to ship pre-built binaries
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dnl of some of the package-specific software. It is not clear
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dnl just what would be the best way of shipping these - putting
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dnl them into the epk's would not be quite right because that would
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dnl make the epk's host-specific rather than generic.
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dnl
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dnl There is an unresolved problem with possible dependencies between
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dnl packages, if e.g. the host-side of the synthetic ethernet package could
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dnl only be built after the architectural synthetic target package.
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dnl Some of the eCos documentation is generic and lives in the "doc"
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dnl subdirectory. Other eCos documentation is package-specific and lives
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dnl in the appropriate package directory. At present there is no support
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dnl for building the documentation via configure and make, but such
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dnl support may be added in future.
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dnl
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dnl There is a subdirectory acsupport containing various files such
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dnl as config.guess and install.sh that are common. This also contains
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dnl an acinclude.m4 file with various macros that are useful for
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dnl eCos.
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dnl Generic initialization.
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AC_INIT(acsupport/config.guess)
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AC_CONFIG_AUX_DIR(acsupport)
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AC_CANONICAL_HOST
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AM_INIT_AUTOMAKE(eCos,2.0,0)
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AM_MAINTAINER_MODE
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ECOS_CHECK_BUILD_ne_SRC
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dnl Nothing actually gets built in this directory, so there should be no
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dnl need to worry about compiler flags etc. Instead, the problem is
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dnl figuring out what should actually get built.
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dnl
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dnl 1) the host subdirectory should always get built, if it exists.
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dnl With the 2.0 release system the directory gets moved to
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dnl tools/src
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if test -f "${srcdir}/host/configure" ; then
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SUBDIRS="host"
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elif test -f "${srcdir}/tools/src/configure" ; then
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SUBDIRS="tools/src"
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else
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SUBDIRS=""
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fi
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dnl 2) any package which has a configure script in a
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dnl current/host subdirectory should also get built.
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dnl
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dnl Searching the directory tree is currently done by shell globbing.
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dnl Invoking "find" with suitable arguments might be quicker, but
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dnl less portable. On some hosts there may be problems with environmental
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dnl limits if too many packages provide host-side software.
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dnl
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dnl Currently there is no ordering of packages, so e.g. a device
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dnl driver's host-side support cannot depend on some HAL package
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dnl because the latter may not have been built and installed yet.
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dnl This is a good thing because packages are meant to be self-contained
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dnl whenever possible. Interaction between packages is typically handled
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dnl at the Tcl level at run-time, so there are no build-time complications.
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PKGHOSTDIRS=""
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FOUND_CONFIGURES=""
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FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/host/configure"
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FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/host/configure"
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FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/host/configure"
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FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/*/host/configure"
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FOUND_CONFIGURES="${FOUND_CONFIGURES} ${srcdir}/packages/*/*/*/*/*/*/host/configure"
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for configure in ${FOUND_CONFIGURES}; do
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if test -f ${configure}; then
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dnl A configure script has been found in the source tree.
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dnl First turn it into a directory, then replace the absolute path
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dnl with a relative one.
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hostdir=`dirname ${configure}`
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hostdir=`echo ${hostdir} | sed -e "s:^${srcdir}/::"`
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PKGHOSTDIRS="${PKGHOSTDIRS} ${hostdir}"
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fi
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done
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SUBDIRS="${SUBDIRS} ${PKGHOSTDIRS}"
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dnl Because the eCos directory layout does not conform to GNU conventions
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dnl it is necessary to create various levels of intermediate directories.
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dnl This happens via config.status, prior to the recursion into the
|
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dnl appropriate directories.
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AC_OUTPUT_COMMANDS([${CONFIG_SHELL-/bin/sh} ${top_srcdir}/acsupport/mkinstalldirs ${REQUIRED_DIRS}],REQUIRED_DIRS="${SUBDIRS}")
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AC_SUBST(SUBDIRS)
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AC_CONFIG_SUBDIRS(${SUBDIRS})
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AC_OUTPUT(Makefile)
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