and not likely to become so. Comments on each configuration
are below.
+ Force CPU386 - This BSP was developed as part of the initial
port of RTEMS to the i386. This board has been unavailable
for a long time now.
+ GO32 - This BSP and some CPU code supported djgpp v1.x. This
version is now quite old. No one has stepped forward to
update the code to v2.x which may be technically impossible
anyway. More importantly, go32 has been superceded by the pc386 BSP.
and not likely to become so. Comments on each configuration
are below.
+ Force CPU386 - This BSP was developed as part of the initial
port of RTEMS to the i386. This board has been unavailable
for a long time now.
+ GO32 - This BSP and some CPU code supported djgpp v1.x. This
version is now quite old. No one has stepped forward to
update the code to v2.x which may be technically impossible
anyway. More importantly, go32 has been superceded by the pc386 BSP.
FYI: I am not talking about using "make -C <dir>", which probably
is much faster on M$ hosts than RTEMS's implementation, but about
removing --enable-gmake-print support and to apply a variant of
automake's subdirectory.
Automake's subdirectory rule seems to be a little bit faster, but I
wouldn't bet on this.
Attached to this mail is my proposal.
After applying the patch, please run
cvs rm aclocal/enable-gmake-print.m4
./autogen
Yep, I have a bunch of bug-fixes and additions pending (Yet another monster
patch, ... I can hear you scream :-).
1) configure.in : one AC_CONFIG_HEADER(...) line too much.
2) configure.in: gcc28 support is enabled by default, i.e. if no
--enable-gcc28 option is passed on the command line. I am not sure if this
is intentional.
IMO, AC_ARG_ENABLE for --enable-gcc28 should look like:
AC_ARG_ENABLE(gcc28, \
[ --enable-gcc28 enable use of gcc 2.8.x features], \
[case "${enableval}" in
yes) RTEMS_USE_GCC272=no ;;
no) RTEMS_USE_GCC272=yes ;;
*) AC_MSG_ERROR(bad value ${enableval} for gcc-28 option) ;;
esac],[RTEMS_USE_GCC272=yes])
3) At the end of c/src/exec/score/cpu/m68k/m68k.h
> #ifdef __cplusplus
> }
> #endif
>
> #endif /* !ASM */
in my opinion these two statements should be swapped:
> #endif /* !ASM */
>
> #ifdef __cplusplus
> }
> #endif
I didn't try to compile for m68k, but does't this give an error? Is it
compensated somewhere else - or didn't I look carefully enough?
5) configure.in: --enable-cpp should probably be renamed to --enable-cxx, as
gnu-programs use "cxx" to specify C++ specific configure options, while cpp
is used for the preprocessor (e.g egcs uses --with-cxx-includedir, autoconf
internally uses $CXX),
6) The macro files from aclocal/*.m4 contain the buggy sed-rules formerly
contained in aclocal..m4, i.e. the sed/sort-bug fix to aclocal.m4 didn't
make it to aclocal/*.m4. I think I should feel guilty for that - Obviously I
submitted the contents of an old aclocal-directory last time. - Sorry.
7) For sh-rtems, we currently need to add additional managers to
MANAGERS_REQUIRED (from inside of custom/*.cfg). Currently MANAGERS_REQUIRED
is defined in make/compilers/*.cfg. This seems to prevent overriding
MANAGERS_REQUIRED from custom/*.cfg files - Obviously the files are included
in such a way that the settings from compilers/*cfg always override settings
from custom/*.cfg files.
Furthermore, I think, defining MANAGERS_* inside gcc-<target>.cfg files is
not correct - MANAGERS are not gcc-variant-dependent, but depend
on targets/bsps and therefore should be defined in a bsp/target dependent
file, e.g. in custom/*.cfg or target.cfg.in.
I think defining default settings for MANAGERS* in custom/default.cfg could
be an appropriate location. But this requires all custom/*.cfg files to
include default.cfg, which *-posix.cfg files don't seem to do.
Therefore I would like propose to move MANAGERS* to target.cfg.in - they are
included by all custom/*.cfg files. Perhaps we/you should use this
opportunity to merge parts from custom/default.cfg into target.cfg.in. This
ensures to have the setting included once per target makefile and will open
the opportunity to have autoconf doing additional work on
bsp-configurations.
Peanuts sofar, ... but here it comes ... (:-)
8) I am preparing a major enhancement to autoconf support for
gnutools/compilers. It is not yet finished, but usable and I'll therefore
attach a preliminary version to this mail.
Motivation:
* Fix problems with --enable-gcc28, if target-cc is not gcc28 compatible
* Fix -pipe problems
* Fix problems with hard-coded paths in configuration files (esp. posix)
* Fix consistency problems with explictly given gnutools and gcc's gnutools
Currently included:
* detection and checking of host and target compiler (gcc/g++)
* checking if target gnutools are in path
* checking if <target>-gcc -specs works (autodisabling gcc28 if not)
* checking if <target>-gcc -pipe works
Todo :
* *posix.cfg files are not yet adapted => The hard-coded paths for these
systems are still in use.
* Check if the host compiler $CC is properly propagated to the Makefiles (I
doubt it, but this should not matter)
* Check if rtems' generic tools still work properly (It looks like, but who
knows)
* Integrate CXX support into default.cfg or gcc-target-default.cfg (It looks
like C++ support is only used by posix BSPs)
* Automatically handle RANLIB/MKLIB for targets
* Plenty ... (:-)
Open problems:
* Untested for non-gcc compatible host and target compilers. This should be
no problem if the tools are named follow gnutool's naming convention and are
included in $PATH while running configure.
* Intentionally using different tools than that gcc has been configured for,
e.g. use a different assembler ? This should be still possible if
XX_FOR_TARGET is hard-coded into custom/*.cfg. I don't see why anybody
should want to do this, but who knows?
I have tested this version on linux and solaris hosts, with gcc's
directories mounted at weird non-standard mount points, using egcs
(linux/sh-rtemscoff), gcc-2.7.2.2 using native tools (solaris), gcc-2.7.2.3
w/ gnutools (solaris/linux). I don't expect it to break anything, but of
cause I can't promise it. It will break most/all *-posix.cfg configuration
almost for certain, but not more as rtems' current *posix.cfg configurations
already do (hard-coded configurations).
I am not sure if this is ready to be included into the next snapshot or not.
Perhaps you might try this on your systems and if it you don't notice
serious bugs you might put it into the snapshot for public testing (I don't
like this, but I don't see another possiblity to test generality).
I enclose a patch for configure.in and some configuration files which
comprizes fixes for all items mentioned except of #3 . Don't forget to run
"aclocal -I aclocal; autoconf;" after applying the patch (:-).
> RTEMS is under CVS control and has been since rtems 3.1.16 which was
> around May 1995. So I just to add the $Id$. If you notice other files
> with missing $Id$'s let me know. I try to keep w\up with it.
Now that you have asked -- I'll attach a list of files lacking an RCS-Id to
this mail. This list has been generated by a little sh-script I'll also
enclose.
GNU autoconf. This is the first large step in allowing an RTEMS
user to perform a one-tree build (per crossgcc FAQ) including RTEMS
in the build process. With this change RTEMS is configured in
built in the same style as the GNU tools, yet retains the basic
structure of its traditional Makefiles (ala Tony Bennett).
Jiri Gaisler (jgais@wd.estec.esa.nl) deserves (and received)
a big thank you for doing this.
There are still issues to be resolved but as of this commit, all target
which can be built on a linux host have been using a modified version
of the source Jiri submitted. This source was merged and most targets
built in the tree before this commit.
There are some issues which remain to be resolved but they are primarily
related to host OS dependencies, script issues, the use of gawk
for hack_specs, and the dependence on gcc snapshots. These will
be resolved.
