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configure.in
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configure.in
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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 This file is part of the eCos host tools.
dnl Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2 or (at your option) any
dnl later version.
dnl
dnl This program is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the
dnl Free Software Foundation, Inc., 51 Franklin Street,
dnl Fifth Floor, Boston, MA 02110-1301, 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
dnl Detect attempts at cross-compilation. Usually this is the result
dnl of somebody failing to read the documentation or the README.host
dnl file.
if test "${target_alias}x" != "x" ; then
AC_MSG_ERROR("
================================================================
You have specified a target ${target_alias}.
This configure script is for building the eCos host-side support
tools which are independent of the target architecture. It is not
used for building eCos itself.
If your intention is to build eCos itself then you should first
read the relevant documentation starting with the User's Guide.
If your intention is to rebuild the host-side support tools then
there is no need to specify --target.
If your intention is to cross-compile the host-side support tools
then you should be using --host instead of --target.
================================================================
")
fi
dnl Make sure the source and build trees are kept separate.
ECOS_CHECK_BUILD_ne_SRC
dnl Nothing actually gets built in this directory, so there should be no
dnl need to worry about compiler flags etc. Instead, the problem is
dnl figuring out what should actually get built.
dnl
dnl 1) the host subdirectory should always get built, if it exists.
dnl With the 2.0 release system the directory gets moved to
dnl tools/src
if test -f "${srcdir}/host/configure" ; then
ecos_subdirs="host"
elif test -f "${srcdir}/tools/src/configure" ; then
ecos_subdirs="tools/src"
else
ecos_subdirs=""
fi
dnl 2) any package which has a configure script in a
dnl current/host subdirectory should also get built.
dnl
dnl Searching the directory tree is currently done by shell globbing.
dnl Invoking "find" with suitable arguments might be quicker, but
dnl less portable. On some hosts there may be problems with environmental
dnl limits if too many packages provide host-side software.
dnl
dnl Currently there is no ordering of packages, so e.g. a device
dnl driver's host-side support cannot depend on some HAL package
dnl because the latter may not have been built and installed yet.
dnl This is a good thing because packages are meant to be self-contained
dnl whenever possible. Interaction between packages is typically handled
dnl at the Tcl level at run-time, so there are no build-time complications.
AC_MSG_NOTICE([searching for configure scripts in eCos packages'
host subdirectories. This operation can take a long time.
If running on Windows and the eCos repository is accessed
over a network then it may take some hours.])
ecos_hostdirs=""
ecos_configure_scripts="${srcdir}/packages/*/*/host/configure"
ecos_configure_scripts="${ecos_configure_scripts} ${srcdir}/packages/*/*/*/host/configure"
ecos_configure_scripts="${ecos_configure_scripts} ${srcdir}/packages/*/*/*/*/host/configure"
ecos_configure_scripts="${ecos_configure_scripts} ${srcdir}/packages/*/*/*/*/*/host/configure"
ecos_configure_scripts="${ecos_configure_scripts} ${srcdir}/packages/*/*/*/*/*/*/host/configure"
for configure in ${ecos_configure_scripts}; 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}/::"`
ecos_hostdirs="${ecos_hostdirs} ${hostdir}"
fi
done
AC_MSG_NOTICE([found configure scripts in
${ecos_hostdirs}])
ecos_subdirs="${ecos_subdirs} ${ecos_hostdirs}"
dnl Because the eCos directory layout does not conform to GNU conventions
dnl it is necessary to create various levels of intermediate directories.
dnl This happens via config.status, prior to the recursion into the
dnl appropriate directories.
AC_OUTPUT_COMMANDS([${CONFIG_SHELL-/bin/sh} ${ac_top_srcdir}/acsupport/mkinstalldirs ${REQUIRED_DIRS}],REQUIRED_DIRS="${ecos_subdirs}")
dnl This causes warnings with current versions of configure which
dnl want literal arguments. Since this script deliberately searches
dnl for subdirectories there is no obvious way to eliminate those
dnl warnings.
AC_CONFIG_SUBDIRS(${ecos_subdirs})
AC_OUTPUT(Makefile)