This is part of a major patch from Ralf Corsepius <corsepiu@faw.uni-ulm.de>

to move RTEMS more to automake/autoconf and GNU compliance.

    Finally, here they are: the "big-patch" patches - merged into one big
    patch (~1.5MB).

    Sorry for the delay, but testing took much more time than I had expected
    - esp. reworking the acpolish script triggered many more tiny issues
    than I had expected (cf. below).

    At least, now you've got something to spend your weekend with :-.


    WARNINGS:
    * I've gone a little  ??) further than I had announced before.
    * Several directories have been moved.
    * Several files have been added and removed
    * I have tested it with many BSPs/CPUs and a variety of permutiations of
    configuration flags, but not with all.
    * Most parts of the patch are automatically generated, however there are
    many tiny manual modifications.

    APPLYING THE PATCH:

    ./autogen -c
    mkdir tools
    mv c/src/exec/score/tools tools/cpu
    mv c/build-tools tools/build
    mv c/update-tools tools/update
    patch -p1 -E < rtems-rc-19990709-0.diff
    ./autogen

    If the patch doesn't apply to rtems-cvs, I would suggest that you should
    try to apply it brute-force and then to run tools/update/rtems-polish.sh
    -ac -am afterwards. A recursive diff between rtems-19990709 + patch and
    rtems-cvs + patch then should report only a few dozen significant
    changes to configuration files which need to be merged manually (IIRC, I
    did not change any source files).

    *** Attention: There are files to be removed, moved, copied and added
    in/to CVS!

    NEWS/CHANGES:
    1. Configuration takes place in 3 stages: 1. per host (toplevel
    configure script), 2. per target (c/configure), 3. per bsp
    c/src/configure automatically triggered from ./configure and
    c/Makefile.am.
    2. Building of subdirectory c/ takes place in c/$(target_alias) for
    cross-targets in c/ for native targets
    3. Building of subdirectory c/src takes place in c/${target_alias}/<bsp>
    for cross-targets, c/<bsp> for native targets
    4. c/build-tools moved to tools/build
    5. c/src/exec/score/cpu/tools moved to tools/cpu (=cpu-tools split out)
    6. c/update-tools moved to tools/update
    7. New subdirectory c/src/make, handles files from make/ on a per BSP
    basis
    8. Maintainer mode support: Ie. if configuring with
    --enable-maintainer-mode disabled (the default), then tracking of many
    dependencies will be disabled in Makefiles. Esp. many dependencies for
    auto* generated files will be switched off in Makefiles. Ie. if not
    using "--enable-maintainer-mode" many auto* generated files will not be
    updated automatically, i.e. normal users should not be required to have
    auto* tools anymore (untested).
    9. Independent configuration scripts for / (toplevel), tools/build,
    tools/cpu, tools/update, c/, c/src/, c/src/exec, c/src/lib, c/src/tests,
    c/src/make
    10. Automake support for all directories above and besides c/src
    11. "preinstall" now is implemented as depth-first recursive make target

    12. host compiled tools (exception bsp-tools) are accessed in location
    in the build tree instead of inside the build-tree when building RTEMS.
    13. RTEMS_ROOT and PROJECT_ROOT now point to directories inside the
    build-tree - many tiny changes as consequence from this.
    14. --with-cross-host support removed (offically announced obsolete by
    cygnus)
    15. Changing the order of building libraries below c/src/lib/
    16. Former toplevel configure script broken into aclocal/*.m4 macros
    17. Newlib now detected by configure macros, RTEMS_HAS_NEWLIB removed
    from *cfg.
    18. sptables.h now generated by autoconf
    19. Rules for "mkinstalldirs temporary installation tree" moved from
    c/Makefile to subdirectories.
    20. Cpu-tools do not get installed.
    21. FIX: Use ACLOCAL_AMFLAGS instead of ACLOCAL = -I ... in Makefile.ams
    which are in directories with own configure scripts.
    22. Hardcoding BSP names into libbsp/.../tools to avoid RTEMS_BSP get
    overridden from the environment.
    22. FIX: Handling of MP_PIECES in various Makefiles
    23. FIX: Removing "::" rules from some Makefile.ins
    24. FIX: File permission chaos: (-m 444 and -m 555 vs. -m 644 and -m
    755) - Now all include files use -m 644.
    25. Removed many gnumake-conditionals in Makefile.ins - Partially
    replaced with automake-conditional, partially replaced with
    conditionalized Makefile variables (... _yes_V)
    26. Massively reworked acpolish: acpolish now parses Makefile.ins and
    interprets parts of the Makefile.ins.
    27. FIX: Some $(wildcard $(srcdir)/*.h) macros removed / replaced with
    explicit lists of files in Makefile.ins.
    28. FIX: Replacing MKLIB with RANLIB in Makefile.ins
    29. HACK: Add preinstallation for pc386 specific
    $(PROJECT_RELEASE)/BootImgs directory

    ... many more details, I can't recall


    KNOWN BUGS:
    1. make [debug|profile]_install do not do what they are promissing.
    "make [debug|profile] install" does what "make [debug|profile]_install"
    has been doing. Proposal: remove [debug|profile]_install
    2. Dependencies between temporary installation tree and source tree are
    not yet handled correctly.
    3. Dependencies between temporary installation tree and source tree are
    handled ineffencently (Using INSTALL_CHANGE instead of make
    dependencies)
    4. RTEMS_ROOT, PROJECT_ROOT, top_builddir, RTEMS_TOPdir now are
    redundant.
    5. The new configure scripts still are in their infancy. They contain
    redundant checks and might still contain bugs, too.
    6. RTEMS autoconf Makefile.ins use a mixture of configuration
    information gathered in c/$(target_alias)/<bsp>/make and of information
    collected from their configure scripts.
    7. make dist is not fully functional
    8. Subdirectory host-/build-/target- configure options (--target,
    --host, --build) do not conform to Cygnus/GNU conventions.
    9. Some RTEMS autoconf Makefile.in's makefile targets are not supported
    in automake Makefile.ams/ins (e.g. get, clobber).
    10. Some automake standard targets are not propagated from toplevel and
    c/Makefile.am to autoconf subdirectories (eg. make dist).
    11. rpcgen generated files are not part of the source-tree (Automake
    conventions favor supplying generated files inside the source-tree,
    however there is no support for rpcgen generated files in automake, cf.
    yacc/lex support in automake).
    12. RTEMS_HAS_RDBG handling is flaky. make/*.cfg use RTEMS_HAS_RDBG per
    CPU, while librdb's sources can only be built per BSP. Raises the more
    general question whether librdbg located correctly in the source-tree.
    13. All make/*cfg files are configured per cpu, currently there is no
    location to store per-bsp configuration information --> bsp.cfg, per
    aconfig.h?
    14. "make install" without having run "make all" beforehand does not
    work.
    15. handling of --enable-multiprocessing seems to be broken in
    make/custom/*
    16. Makefile.ins still exploit many gmake features.
    17. File permisson chaos on libraries (no explict -m for
    libraries/rels/etc).
    18. mcp750 Makefiles are broken (Note: I *do* mean buggy - I am not
    talking about "not-conforming to  conventions", here :-).
    19. Dependencies between configure scripts are not handled, eg. aborting
    "make RTEMS_BSP=<bsp>" can leave the build-tree in an unusable state.
    20. "make clean" does not delete <build-tree>/<bsp>. This is intentional
    for now, because rerunning "make" after "make clean" requires an
    explicit "make preinstall" afterwards now. This should be done
    automatically, but doesn't work in this case for now. To work around
    this problem <build-tree>/<bsp> is kept during "make clean" for now
    (HACK).

    TODO:
    1. split out host-compiled bsp-tools
    2. Use Cygnus/GNU standards for cross-compiling target-subdir
    (CC=CC_FOR_TARGET .. configure --host=${target_alias}
    --build=`config.guess'}), to be added to toplevel configure script after
    splitting out bsp-tools.
    3. Exploit per cpu support directory (c/src/<cpu>)- Splitting out
    per-cpu libraries - Are there any?
    4. Further automake support
    5. Converting subdirectories into standalone / self-contained
    subdirectories (Esp. moving their headers to the same common root as
    their sources, eg. mv lib/include/rtems++
    lib/librtems++/include/rtems++) - This is the main obstacle which
    prevents moving further towards automake.
    6. Propagating values from *.cfg into Makefiles instead of propagating
    them at make time via Makefile-fragments (i.e. try to avoid using
    *.cfg).
    7. Testing on cygwin host (I *do* expect cygwin specific problems).
    8. The ARCH in o-$(ARCH)-$(VARIANT) build-subdirectories is not needed
    anymore.

    GENERAL ISSUES:
    1. Temporary installation tree -- Ian and I seem to disagree basically.
    Though I think that I understand his argumentation, I do not share it.
    IMO, his way of using the buildtree is mis-using the build-tree, relying
    on an inofficial feature of RTEMS's current implementation, which
    doesn't even work correctly in the current build-tree, though it
    attempts hard to do so. From my very POV, it unnecessarily complicates
    the structures of the source- and build-trees. It is not supported by
    automake (No automatic generation for the necessary rules) and
    complicates the transition to automake significantly (Generating the
    rules with an enhanced version of acpolish could be possible).
    As Ian correctly pointed out, here a management decision is needed -
    though I don't see the need to draw this decision in short terms.

    2. preinstallation generally is a sure means to spoil the structure of
    the source tree, IMHO (No ranting intended, I am completly serious about
    this one). eg. through tree dependencies. The worst problem related to
    this I have found in the meantime is bsp_specs. bsp_specs is part of
    libbsp, ie. there is *no* way to build *any* part of the source tree
    *without* having a BSP *preinstalled*.
    Note: This issue is related to issue 1., but is not identical - The
    difference is the change of the order make rules have to be triggered.
    While preinstallation triggers rules spread all over the source tree
    before a "make all" can be run, a temporary installation tree could also
    be installed by post "make all" hooks (all-local:, to be run after make
    all in a directory is completed) if the directories' dependencies would
    be a tree,

    3. Stuctural dependencies between subdirectories.
    4. Depth of the source tree (Prevents multilibbing and introduces many
    unnecessary configure scripts).
    5. per cpu vs. per bsp configuration (There are no real per-cpu parts
    yets :-).
    6. automake does not support $makefiles in AC_OUTPUT. Unlike before, we
    now should try to avoid RTEMS_CHECK_MAKEFILE and to hard-code as much
    paths to Makefiles as possible.
    7. General redesign of the source tree
    8. Main installation point - Changing it to ${prefix}/${target_alias}. ?

    Besides item 8. (which is a must, IMHO), as far as I see most of them
    can not be solved soon and will remain issues in the mid- to long-term
    :-.

    REMARKS:

    * You (as the maintainer) should always use --enable-maintainer-mode
    when building RTEMS to ensure that maintainer mode generated files (esp.
    those in c/src/make) will be updated when make/* files have changed.
    * Use @RTEMS_BSP@ in Makefile.ins and Makefile.ams below c/src/,
    $(RTEMS_BSP) or ${RTEMS_BSP} will be overridden from environment
    variables when using make RTEMS_BSP="....".
    * c/src/make is a temporary cludge until configuration issues are
    solved. At the moment it is configured per bsp, but contains
    per-target/cpu info only. Its main purpose now is to circumvent
    modifying make/*.cfg files, because I consider make/* to be frozen for
    backward compatibilty.
    * This patch should only affect configuration files. At least I do not
    remember having touched any source files.

    * To build the bare bsp you now need to mention it in --enable-rtemsbsp.

    Example: building gensh1 and sh1/bare simultaneously:
    ../rtems-rc-19990709-1/configure --target=sh-rtems \
    --enable-rtemsbsp="bare gensh1" \
    --prefix=/tmp/rtems \
    --enable-bare-cpu-cflags='-DMHZ=20 -m1
    -DCPU_CONSOLE_DEVNAME=\"/dev/null\"' \
    --enable-bare-cpu-model=sh7032 \
    --enable-maintainer-mode \
    --enable-cxx
    make
    make install

    * The next steps in development would be to split out bsp-tools and then
    to change to Cygnus/GNU canonicalization conventions for building the c/
    subdirectory afterwards (i.e. many standard AC_*.m4 macros could be used
    instead of customized versions)

    FINAL REMARK:
    The issues mentioned in the lists above sound much worser than the
    situation actually is. Most of them are not specific to this patch, but
    are also valid for the snapshot. I just wrote down what I came across
    when working on the patch over the last few weeks.

    I wouldn't be too surprised if you don't like the patch at the current
    point in development. I am willing to discuss details and problems, I
    also have no problem if you would post-pone applying this patch to times
    after 4.1, but rejecting it as a whole for all times would be a false
    management decision, IMHO.

    Therefore I would suggest that you, if your time constaints allow it,
    should at least play a little while with this patch to understand what
    is going on and  before drawing a decision on how to handle this
    proposal. I know this patch is neither perfect nor complete, but I
    consider it to be a major breakthrough.  Don't be anxious because of the
    size of the patch, the core of the patch is rather small, the size is
    mainly the side effect of some systematic cleanups inside the Makefiles
    (result of acpolish).

    Feel free to ask if you encounter problems, if you don't understand
    something or if you meet bugs - I am far from being perfect and am
    prepared to answer them.

    Ralf.

    --
    Ralf Corsepius
    Forschungsinstitut fuer Anwendungsorientierte Wissensverarbeitung (FAW)
    Helmholtzstr. 16, 89081 Ulm, Germany     Tel: +49/731/501-8690
    mailto:corsepiu@faw.uni-ulm.de           FAX: +49/731/501-999
    http://www.faw.uni-ulm.de

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