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#  $Id: README.configure,v 1.2 2001-09-27 11:59:04 chris Exp $

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1. Autoconf support

===================

This version of RTEMS is configured with GNU autoconf. RTEMS can be

configured and built either standalone or together with the compiler

tools in the Cygnus one-tree structure. Using autoconf also means

that RTEMS now can be built in a separate build directory.

2. Installation

===============

2.1 Standalone build

To configure RTEMS for a specific target, run configure in the build

directory. In addition to the standard configure options, the following

RTEMS-specific option are supported:

        --disable-rtems-inlines

        --disable-posix

        --disable-itron

        --disable-networking

        --enable-cxx

        --enable-bare-cpu-model=

        --enable-bare-cpu-cflags=

        --enable-gcc28               (also use enable-libcdir when disabled)

        --enable-libcdir=      (do not use if gcc 2.8 is enabled)

        --enable-multiprocessing

        --enable-rtemsbsp="bsp1 bsp2 ..."

        --enable-tests

        --enable-rdbg            (only valid for i386 and some PowerPC BSPs)

In addition, the following standard autoconf options are frequently

used when configuring RTEMS installations:

        --prefix=INSTALL_DIRECTORY

        --program-prefix=

By default, inline routines are used instead of macros where possible.

Macros can be selected using the --disable-inlines option.  [NOTE:

Some APIs may not support macro versions of their inline routines.]

By default, the RTEMS POSIX 1003.1b interface is built for targets that support

it. It can be disabled with the --disable-posix option.

By default, the RTEMS uITRON interface is built for targets that support

it. It can be disabled with the --disable-itron option.

By default, the RTEMS networking support is built for targets which

support it.  It can be specifically disabled for those targets

with the --disable-networking option.

By default, the RTEMS remote debugger server support is not built.

It can be specifically enabled for the targets that support it.

with the --enable-rdbg option. NB : the RTEMS networking support

must be enabled to support the remote debugger server.

By default, the RTEMS support of C++ is disabled.  It can be enabled

with the --enable-cxx option. If the rtems++ C++ library is installed

it will also be build.

By default, the RTEMS test suites are NOT configured -- only the

sample tests are built.  The --enable-tests will not configure

the RTEMS test suite. The default speeds up the build

and configure process when the tests are not desired.

By default, RTEMS is built using arguments and build rules which are

NOT compatible with gcc 2.7.2.2.  If using a gcc which supports the

-specs option, then the --enable-gcc28 option may be used to enable

this feature.  You should use the --enable-gcc28 option when using

either the egcs source tree, testgcc snapshots, or gcc 2.8.0 or newer.

If you --disable-gcc28, then you MUST  specify the location of the

Standard C Library with the --enable-libcdir option.   [NOTE: These

options are considered obsolete and may be removed in a future

RTEMS release.]

By default, multiprocessing is is not built.  It can be enabled

for those BSPs supporting it by the --enable-multiprocessing option.

By default, all bsps for a target are built. The bare BSP is not built

unless directlty specified. There are  two ways of changing this:

  + use the --enable-rtemsbsp otion which will set the specified

    bsps as the default bsps, or

  + set the RTEMS_BSP variable during make (see below).

The --enable-rtemsbsp= option configures RTEMS for a specific target

architecture.  The following targets are supported:

        (none)                  will build the host-based version on Linux,

                                Solaris and HPUX.

        a29k-rtems              only standalone, uses non-gnu compiler

        i386-rtems

        i960-rtems

        hppa1.1-rtems

        m68k-rtems

        mips64orion-rtems

        no_cpu-rtems

        powerpc-rtems

        sparc-rtems

        bare                    see notes

The cross-compiler is set to $(target)-gcc by default. This can be

overriden by:

  + using the --program-prefix option to configure to specify the

    string which will prepended to the tool names.  Be sure to include

    a trailing "-".  For example, to use a m68k-coff toolset, use the

    --program-prefix=m68k-coff- option.

To build, run make in the build directory. To specify which bsps to build,

add the RTEMS_BSP="bsp1 bsp2 .." to the make command.  Specifying multiple

BSPs to build only works from the top level build directory.

Installation is done under $(prefix)/rtems.

As an example, to build and install the mvme136 and dmv152 bsps for m68k do:

        (path_to_rtems_src)/configure --target=m68k-rtems

        make RTEMS_BSP="mvme136 dmv152"

        make install RTEMS_BSP="mvme136 dmv152"

The sample tests are built by 'make all', do a 'make test' to build the full

test suite.

2.2 Build with Cygnus one-tree release

To build and install RTEMS with the one-tree structure, just copy the rtems

directory to the tree. The one-tree configure.in and Makefile.in has to be

replaced with the RTEMS-aware versions. The build options are the same as

for the standalone build.

2.3 Target Dependent Notes

bare:

  1.  See the README in the bare bsp source directory. This should

      contain all info you need.

  2.  The bare bsp source contains a script to show how to build it.

  3.  The configure flags must be used to get the bare bsp to work.

      The --enable-bare-cpu-model and --enable-bare-cpu-cflags are the

      only pieces of information. The module is usually a gcc module

      such as m68302 or mcpu32. The flags are passed directly to gcc.

      Use "" if more than one option is specified.

3. To use the installed RTEMS library

=====================================

To use the installed RTEMS bsps to build applications, the application

makefile has to include a bsp-specific makefile that will define the

RTEMS variables necessary to find include files and libraries. The

bsp-specific makefile is installed at

        $(RTEMS_MAKEFILE_PATH)/Makefile.inc

For the erc32 bsp installed at /usr/local/cross, the environment

variable RTEMS_MAKEFILE_PATH would be set as follows to the

following:

/usr/local/cross/sparc-rtems/rtems/erc32/Makefile.inc

4. Supported target bsps

========================

The following bsps are supported:

host-based      : posix (on linux, solaris and hpux)

a29k            : portsw

i386            : i386ex pc386

i960            : cvme961

hppa1.1         : simhppa

m68k            : dmv152 efi332 efi68k gen68302 gen68340 gen68360

                  gen68360_040 idp mvme136 mvme147 mvme147s mvme162 ods68302

no_cpu          : no_bsp

mips64orion     : p4600 p4650 (p4000 port with either R4600 or R4650)

powerpc         : papyrus psim helas403

sh              : gensh1

sparc           : erc32

any             : bare

5. Makefile structure

=====================

The makefiles have been re-organised. Most gnu-based bsps now use three

main makefiles:

    + custom/default.cfg,

    + custom/bsp.cfg and

    + ompilers/gcc-target-default.cfg.

Default.cfg sets the deafult values of certain common build options.

Bsp.cfg set bsp-specific build options and can also override the

default settings.

Gcc-target-default.cfg contains the common gcc definitions. Some targets

(a29k, no_cpu, and posix) still use the old structure.

6. Adding a bsp

===============

The top-level configure.in has to be modified if a new target is added

or if a new bsp is to be built by default. The additions required is

basically to add which makefiles are to be created by configure and

to add the target to the selection statement. To re-generate

configure, autoconf-2.12 is needed.

7. Tested configurations

========================

All gnu-based bsps have been built on Linux.

The native (posix) ports have been built and run only on Linux.

The following configurations have NOT been tested:

    + Anything on Nextstep, HPUX and Irix.

    + The a29k port.

8. Pre-requisites

=================

Gawk version 2 or higher.

GNU make version 3.72 or higher.

Bash.

gcc version ???

TODO

====

The install-if-change script requires bash. On solaris systems, this should

be changed to ksh, since ksh is provided with solaris (bash not).

A fairly rescent version of gawk is needed to build RTEMS. This should be

changed so that a plain vanilla awk also works. [NOTE: This dependency

should disappear when the "gcc 2.8 -specs" is finished.]

'make install' should only install necessary files, not the full

PROJECT_RELEASE directory as now.

Posix port on solaris-2.5 fails due to undefined built-in functions

(gcc-2.7.2, might be my installation).

Improve support for 'make CFLAGS=xxx'.