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This is Info file gcc.info, produced by Makeinfo version 1.68 from the
input file gcc.texi.
This file documents the use and the internals of the GNU compiler.
Published by the Free Software Foundation 59 Temple Place - Suite 330
Boston, MA 02111-1307 USA
Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998
Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of this
manual provided the copyright notice and this permission notice are
preserved on all copies.
Permission is granted to copy and distribute modified versions of
this manual under the conditions for verbatim copying, provided also
that the sections entitled "GNU General Public License," "Funding for
Free Software," and "Protect Your Freedom--Fight `Look And Feel'" are
included exactly as in the original, and provided that the entire
resulting derived work is distributed under the terms of a permission
notice identical to this one.
Permission is granted to copy and distribute translations of this
manual into another language, under the above conditions for modified
versions, except that the sections entitled "GNU General Public
License," "Funding for Free Software," and "Protect Your Freedom--Fight
`Look And Feel'", and this permission notice, may be included in
translations approved by the Free Software Foundation instead of in the
original English.

File: gcc.info, Node: Configurations, Next: Other Dir, Up: Installation
Configurations Supported by GNU CC
==================================
Here are the possible CPU types:
1750a, a29k, alpha, arm, cN, clipper, dsp16xx, elxsi, h8300,
hppa1.0, hppa1.1, i370, i386, i486, i586, i860, i960, m32r,
m68000, m68k, m88k, mips, mipsel, mips64, mips64el, ns32k,
powerpc, powerpcle, pyramid, romp, rs6000, sh, sparc, sparclite,
sparc64, vax, we32k.
Here are the recognized company names. As you can see, customary
abbreviations are used rather than the longer official names.
acorn, alliant, altos, apollo, apple, att, bull, cbm, convergent,
convex, crds, dec, dg, dolphin, elxsi, encore, harris, hitachi,
hp, ibm, intergraph, isi, mips, motorola, ncr, next, ns, omron,
plexus, sequent, sgi, sony, sun, tti, unicom, wrs.
The company name is meaningful only to disambiguate when the rest of
the information supplied is insufficient. You can omit it, writing
just `CPU-SYSTEM', if it is not needed. For example, `vax-ultrix4.2'
is equivalent to `vax-dec-ultrix4.2'.
Here is a list of system types:
386bsd, aix, acis, amigaos, aos, aout, aux, bosx, bsd, clix, coff,
ctix, cxux, dgux, dynix, ebmon, ecoff, elf, esix, freebsd, hms,
genix, gnu, linux-gnu, hiux, hpux, iris, irix, isc, luna, lynxos,
mach, minix, msdos, mvs, netbsd, newsos, nindy, ns, osf, osfrose,
ptx, riscix, riscos, rtu, sco, sim, solaris, sunos, sym, sysv,
udi, ultrix, unicos, uniplus, unos, vms, vsta, vxworks, winnt,
xenix.
You can omit the system type; then `configure' guesses the operating
system from the CPU and company.
You can add a version number to the system type; this may or may not
make a difference. For example, you can write `bsd4.3' or `bsd4.4' to
distinguish versions of BSD. In practice, the version number is most
needed for `sysv3' and `sysv4', which are often treated differently.
If you specify an impossible combination such as `i860-dg-vms', then
you may get an error message from `configure', or it may ignore part of
the information and do the best it can with the rest. `configure'
always prints the canonical name for the alternative that it used. GNU
CC does not support all possible alternatives.
Often a particular model of machine has a name. Many machine names
are recognized as aliases for CPU/company combinations. Thus, the
machine name `sun3', mentioned above, is an alias for `m68k-sun'.
Sometimes we accept a company name as a machine name, when the name is
popularly used for a particular machine. Here is a table of the known
machine names:
3300, 3b1, 3bN, 7300, altos3068, altos, apollo68, att-7300,
balance, convex-cN, crds, decstation-3100, decstation, delta,
encore, fx2800, gmicro, hp7NN, hp8NN, hp9k2NN, hp9k3NN, hp9k7NN,
hp9k8NN, iris4d, iris, isi68, m3230, magnum, merlin, miniframe,
mmax, news-3600, news800, news, next, pbd, pc532, pmax, powerpc,
powerpcle, ps2, risc-news, rtpc, sun2, sun386i, sun386, sun3,
sun4, symmetry, tower-32, tower.
Remember that a machine name specifies both the cpu type and the company
name. If you want to install your own homemade configuration files,
you can use `local' as the company name to access them. If you use
configuration `CPU-local', the configuration name without the cpu prefix
is used to form the configuration file names.
Thus, if you specify `m68k-local', configuration uses files
`m68k.md', `local.h', `m68k.c', `xm-local.h', `t-local', and `x-local',
all in the directory `config/m68k'.
Here is a list of configurations that have special treatment or
special things you must know:
`1750a-*-*'
MIL-STD-1750A processors.
The MIL-STD-1750A cross configuration produces output for
`as1750', an assembler/linker available under the GNU Public
License for the 1750A. `as1750' can be obtained at
*ftp://ftp.fta-berlin.de/pub/crossgcc/1750gals/*. A similarly
licensed simulator for the 1750A is available from same address.
You should ignore a fatal error during the building of libgcc
(libgcc is not yet implemented for the 1750A.)
The `as1750' assembler requires the file `ms1750.inc', which is
found in the directory `config/1750a'.
GNU CC produced the same sections as the Fairchild F9450 C
Compiler, namely:
`Normal'
The program code section.
`Static'
The read/write (RAM) data section.
`Konst'
The read-only (ROM) constants section.
`Init'
Initialization section (code to copy KREL to SREL).
The smallest addressable unit is 16 bits (BITS_PER_UNIT is 16).
This means that type `char' is represented with a 16-bit word per
character. The 1750A's "Load/Store Upper/Lower Byte" instructions
are not used by GNU CC.
`alpha-*-osf1'
Systems using processors that implement the DEC Alpha architecture
and are running the DEC Unix (OSF/1) operating system, for example
the DEC Alpha AXP systems.CC.)
GNU CC writes a `.verstamp' directive to the assembler output file
unless it is built as a cross-compiler. It gets the version to
use from the system header file `/usr/include/stamp.h'. If you
install a new version of DEC Unix, you should rebuild GCC to pick
up the new version stamp.
Note that since the Alpha is a 64-bit architecture,
cross-compilers from 32-bit machines will not generate code as
efficient as that generated when the compiler is running on a
64-bit machine because many optimizations that depend on being
able to represent a word on the target in an integral value on the
host cannot be performed. Building cross-compilers on the Alpha
for 32-bit machines has only been tested in a few cases and may
not work properly.
`make compare' may fail on old versions of DEC Unix unless you add
`-save-temps' to `CFLAGS'. On these systems, the name of the
assembler input file is stored in the object file, and that makes
comparison fail if it differs between the `stage1' and `stage2'
compilations. The option `-save-temps' forces a fixed name to be
used for the assembler input file, instead of a randomly chosen
name in `/tmp'. Do not add `-save-temps' unless the comparisons
fail without that option. If you add `-save-temps', you will have
to manually delete the `.i' and `.s' files after each series of
compilations.
GNU CC now supports both the native (ECOFF) debugging format used
by DBX and GDB and an encapsulated STABS format for use only with
GDB. See the discussion of the `--with-stabs' option of
`configure' above for more information on these formats and how to
select them.
There is a bug in DEC's assembler that produces incorrect line
numbers for ECOFF format when the `.align' directive is used. To
work around this problem, GNU CC will not emit such alignment
directives while writing ECOFF format debugging information even
if optimization is being performed. Unfortunately, this has the
very undesirable side-effect that code addresses when `-O' is
specified are different depending on whether or not `-g' is also
specified.
To avoid this behavior, specify `-gstabs+' and use GDB instead of
DBX. DEC is now aware of this problem with the assembler and
hopes to provide a fix shortly.
`arc-*-elf'
Argonaut ARC processor. This configuration is intended for
embedded systems.
`arm-*-aout'
Advanced RISC Machines ARM-family processors. These are often
used in embedded applications. There are no standard Unix
configurations. This configuration corresponds to the basic
instruction sequences and will produce `a.out' format object
modules.
You may need to make a variant of the file `arm.h' for your
particular configuration.
`arm-*-linuxaout'
Any of the ARM family processors running the Linux-based GNU
system with the `a.out' binary format (ELF is not yet supported).
You must use version 2.8.1.0.7 or later of the GNU/Linux binutils,
which you can download from `sunsite.unc.edu:/pub/Linux/GCC' and
other mirror sites for Linux-based GNU systems.
`arm-*-riscix'
The ARM2 or ARM3 processor running RISC iX, Acorn's port of BSD
Unix. If you are running a version of RISC iX prior to 1.2 then
you must specify the version number during configuration. Note
that the assembler shipped with RISC iX does not support stabs
debugging information; a new version of the assembler, with stabs
support included, is now available from Acorn and via ftp
`ftp.acorn.com:/pub/riscix/as+xterm.tar.Z'. To enable stabs
debugging, pass `--with-gnu-as' to configure.
You will need to install GNU `sed' before you can run configure.
`a29k'
AMD Am29k-family processors. These are normally used in embedded
applications. There are no standard Unix configurations. This
configuration corresponds to AMD's standard calling sequence and
binary interface and is compatible with other 29k tools.
You may need to make a variant of the file `a29k.h' for your
particular configuration.
`a29k-*-bsd'
AMD Am29050 used in a system running a variant of BSD Unix.
`decstation-*'
DECstations can support three different personalities: Ultrix, DEC
OSF/1, and OSF/rose. To configure GCC for these platforms use the
following configurations:
`decstation-ultrix'
Ultrix configuration.
`decstation-osf1'
Dec's version of OSF/1.
`decstation-osfrose'
Open Software Foundation reference port of OSF/1 which uses
the OSF/rose object file format instead of ECOFF. Normally,
you would not select this configuration.
The MIPS C compiler needs to be told to increase its table size
for switch statements with the `-Wf,-XNg1500' option in order to
compile `cp/parse.c'. If you use the `-O2' optimization option,
you also need to use `-Olimit 3000'. Both of these options are
automatically generated in the `Makefile' that the shell script
`configure' builds. If you override the `CC' make variable and
use the MIPS compilers, you may need to add `-Wf,-XNg1500 -Olimit
3000'.
`elxsi-elxsi-bsd'
The Elxsi's C compiler has known limitations that prevent it from
compiling GNU C. Please contact `mrs@cygnus.com' for more details.
`dsp16xx'
A port to the AT&T DSP1610 family of processors.
`h8300-*-*'
Hitachi H8/300 series of processors.
The calling convention and structure layout has changed in release
2.6. All code must be recompiled. The calling convention now
passes the first three arguments in function calls in registers.
Structures are no longer a multiple of 2 bytes.
`hppa*-*-*'
There are several variants of the HP-PA processor which run a
variety of operating systems. GNU CC must be configured to use
the correct processor type and operating system, or GNU CC will
not function correctly. The easiest way to handle this problem is
to *not* specify a target when configuring GNU CC, the `configure'
script will try to automatically determine the right processor
type and operating system.
`-g' does not work on HP-UX, since that system uses a peculiar
debugging format which GNU CC does not know about. However, `-g'
will work if you also use GAS and GDB in conjunction with GCC. We
highly recommend using GAS for all HP-PA configurations.
You should be using GAS-2.6 (or later) along with GDB-4.16 (or
later). These can be retrieved from all the traditional GNU ftp
archive sites.
GAS will need to be installed into a directory before `/bin',
`/usr/bin', and `/usr/ccs/bin' in your search path. You should
install GAS before you build GNU CC.
To enable debugging, you must configure GNU CC with the
`--with-gnu-as' option before building.
`i370-*-*'
This port is very preliminary and has many known bugs. We hope to
have a higher-quality port for this machine soon.
`i386-*-linux-gnuoldld'
Use this configuration to generate `a.out' binaries on Linux-based
GNU systems if you do not have gas/binutils version 2.5.2 or later
installed. This is an obsolete configuration.
`i386-*-linux-gnuaout'
Use this configuration to generate `a.out' binaries on Linux-based
GNU systems. This configuration is being superseded. You must use
gas/binutils version 2.5.2 or later.
`i386-*-linux-gnu'
Use this configuration to generate ELF binaries on Linux-based GNU
systems. You must use gas/binutils version 2.5.2 or later.
`i386-*-sco'
Compilation with RCC is recommended. Also, it may be a good idea
to link with GNU malloc instead of the malloc that comes with the
system.
`i386-*-sco3.2v4'
Use this configuration for SCO release 3.2 version 4.
`i386-*-sco3.2v5*'
Use this for the SCO OpenServer Release family including 5.0.0,
5.0.2, 5.0.4, Internet FastStart 1.0, and Internet FastStart 1.1.
GNU CC can generate ELF binaries (if you specify `-melf') or COFF
binaries (the default). If you are going to build your compiler
in ELF mode (once you have bootstrapped the first stage compiler)
you *must* specify `-melf' as part of `CC', *not* `CFLAGS', for
example as `CC="stage1/xgcc -melf -Bstage1/" '. If you do not do
this, the bootstrap will generate incorrect versions of `libgcc.a'.
You must have TLS597 (from ftp.sco.com/TLS) installed for ELF
binaries to work correctly. Note that Open Server 5.0.2 *does*
need TLS597 installed.
*NOTE:* You must follow the instructions about invoking `make
bootstrap' because the native OpenServer compiler builds a
`cc1plus' that will not correctly parse many valid C++ programs.
You must do a `make bootstrap' if you are building with the native
compiler.
`i386-*-isc'
It may be a good idea to link with GNU malloc instead of the
malloc that comes with the system.
In ISC version 4.1, `sed' core dumps when building `deduced.h'.
Use the version of `sed' from version 4.0.
`i386-*-esix'
It may be good idea to link with GNU malloc instead of the malloc
that comes with the system.
`i386-ibm-aix'
You need to use GAS version 2.1 or later, and LD from GNU binutils
version 2.2 or later.
`i386-sequent-bsd'
Go to the Berkeley universe before compiling.
`i386-sequent-ptx1*'
Sequent DYNIX/ptx 1.x.
`i386-sequent-ptx2*'
Sequent DYNIX/ptx 2.x.
`i386-sun-sunos4'
You may find that you need another version of GNU CC to begin
bootstrapping with, since the current version when built with the
system's own compiler seems to get an infinite loop compiling part
of `libgcc2.c'. GNU CC version 2 compiled with GNU CC (any
version) seems not to have this problem.
See *Note Sun Install::, for information on installing GNU CC on
Sun systems.
`i[345]86-*-winnt3.5'
This version requires a GAS that has not yet been released. Until
it is, you can get a prebuilt binary version via anonymous ftp from
`cs.washington.edu:pub/gnat' or `cs.nyu.edu:pub/gnat'. You must
also use the Microsoft header files from the Windows NT 3.5 SDK.
Find these on the CDROM in the `/mstools/h' directory dated
9/4/94. You must use a fixed version of Microsoft linker made
especially for NT 3.5, which is also is available on the NT 3.5
SDK CDROM. If you do not have this linker, can you also use the
linker from Visual C/C++ 1.0 or 2.0.
Installing GNU CC for NT builds a wrapper linker, called `ld.exe',
which mimics the behaviour of Unix `ld' in the specification of
libraries (`-L' and `-l'). `ld.exe' looks for both Unix and
Microsoft named libraries. For example, if you specify `-lfoo',
`ld.exe' will look first for `libfoo.a' and then for `foo.lib'.
You may install GNU CC for Windows NT in one of two ways,
depending on whether or not you have a Unix-like shell and various
Unix-like utilities.
1. If you do not have a Unix-like shell and few Unix-like
utilities, you will use a DOS style batch script called
`configure.bat'. Invoke it as `configure winnt' from an
MSDOS console window or from the program manager dialog box.
`configure.bat' assumes you have already installed and have
in your path a Unix-like `sed' program which is used to
create a working `Makefile' from `Makefile.in'.
`Makefile' uses the Microsoft Nmake program maintenance
utility and the Visual C/C++ V8.00 compiler to build GNU CC.
You need only have the utilities `sed' and `touch' to use
this installation method, which only automatically builds the
compiler itself. You must then examine what `fixinc.winnt'
does, edit the header files by hand and build `libgcc.a'
manually.
2. The second type of installation assumes you are running a
Unix-like shell, have a complete suite of Unix-like utilities
in your path, and have a previous version of GNU CC already
installed, either through building it via the above
installation method or acquiring a pre-built binary. In this
case, use the `configure' script in the normal fashion.
`i860-intel-osf1'
This is the Paragon. If you have version 1.0 of the operating
system, see *Note Installation Problems::, for special things you
need to do to compensate for peculiarities in the system.
`*-lynx-lynxos'
LynxOS 2.2 and earlier comes with GNU CC 1.x already installed as
`/bin/gcc'. You should compile with this instead of `/bin/cc'.
You can tell GNU CC to use the GNU assembler and linker, by
specifying `--with-gnu-as --with-gnu-ld' when configuring. These
will produce COFF format object files and executables; otherwise
GNU CC will use the installed tools, which produce `a.out' format
executables.
`m32r-*-elf'
Mitsubishi M32R processor. This configuration is intended for
embedded systems.
`m68000-hp-bsd'
HP 9000 series 200 running BSD. Note that the C compiler that
comes with this system cannot compile GNU CC; contact
`law@cs.utah.edu' to get binaries of GNU CC for bootstrapping.
`m68k-altos'
Altos 3068. You must use the GNU assembler, linker and debugger.
Also, you must fix a kernel bug. Details in the file
`README.ALTOS'.
`m68k-apple-aux'
Apple Macintosh running A/UX. You may configure GCC to use
either the system assembler and linker or the GNU assembler and
linker. You should use the GNU configuration if you can,
especially if you also want to use GNU C++. You enabled that
configuration with + the `--with-gnu-as' and `--with-gnu-ld'
options to `configure'.
Note the C compiler that comes with this system cannot compile GNU
CC. You can fine binaries of GNU CC for bootstrapping on
`jagubox.gsfc.nasa.gov'. You will also a patched version of
`/bin/ld' there that raises some of the arbitrary limits found in
the original.
`m68k-att-sysv'
AT&T 3b1, a.k.a. 7300 PC. Special procedures are needed to
compile GNU CC with this machine's standard C compiler, due to
bugs in that compiler. You can bootstrap it more easily with
previous versions of GNU CC if you have them.
Installing GNU CC on the 3b1 is difficult if you do not already
have GNU CC running, due to bugs in the installed C compiler.
However, the following procedure might work. We are unable to
test it.
1. Comment out the `#include "config.h"' line near the start of
`cccp.c' and do `make cpp'. This makes a preliminary version
of GNU cpp.
2. Save the old `/lib/cpp' and copy the preliminary GNU cpp to
that file name.
3. Undo your change in `cccp.c', or reinstall the original
version, and do `make cpp' again.
4. Copy this final version of GNU cpp into `/lib/cpp'.
5. Replace every occurrence of `obstack_free' in the file
`tree.c' with `_obstack_free'.
6. Run `make' to get the first-stage GNU CC.
7. Reinstall the original version of `/lib/cpp'.
8. Now you can compile GNU CC with itself and install it in the
normal fashion.
`m68k-bull-sysv'
Bull DPX/2 series 200 and 300 with BOS-2.00.45 up to BOS-2.01. GNU
CC works either with native assembler or GNU assembler. You can use
GNU assembler with native coff generation by providing
`--with-gnu-as' to the configure script or use GNU assembler with
dbx-in-coff encapsulation by providing `--with-gnu-as --stabs'.
For any problem with native assembler or for availability of the
DPX/2 port of GAS, contact `F.Pierresteguy@frcl.bull.fr'.
`m68k-crds-unox'
Use `configure unos' for building on Unos.
The Unos assembler is named `casm' instead of `as'. For some
strange reason linking `/bin/as' to `/bin/casm' changes the
behavior, and does not work. So, when installing GNU CC, you
should install the following script as `as' in the subdirectory
where the passes of GCC are installed:
#!/bin/sh
casm $*
The default Unos library is named `libunos.a' instead of `libc.a'.
To allow GNU CC to function, either change all references to
`-lc' in `gcc.c' to `-lunos' or link `/lib/libc.a' to
`/lib/libunos.a'.
When compiling GNU CC with the standard compiler, to overcome bugs
in the support of `alloca', do not use `-O' when making stage 2.
Then use the stage 2 compiler with `-O' to make the stage 3
compiler. This compiler will have the same characteristics as the
usual stage 2 compiler on other systems. Use it to make a stage 4
compiler and compare that with stage 3 to verify proper
compilation.
(Perhaps simply defining `ALLOCA' in `x-crds' as described in the
comments there will make the above paragraph superfluous. Please
inform us of whether this works.)
Unos uses memory segmentation instead of demand paging, so you
will need a lot of memory. 5 Mb is barely enough if no other
tasks are running. If linking `cc1' fails, try putting the object
files into a library and linking from that library.
`m68k-hp-hpux'
HP 9000 series 300 or 400 running HP-UX. HP-UX version 8.0 has a
bug in the assembler that prevents compilation of GNU CC. To fix
it, get patch PHCO_4484 from HP.
In addition, if you wish to use gas `--with-gnu-as' you must use
gas version 2.1 or later, and you must use the GNU linker version
2.1 or later. Earlier versions of gas relied upon a program which
converted the gas output into the native HP/UX format, but that
program has not been kept up to date. gdb does not understand
that native HP/UX format, so you must use gas if you wish to use
gdb.
`m68k-sun'
Sun 3. We do not provide a configuration file to use the Sun FPA
by default, because programs that establish signal handlers for
floating point traps inherently cannot work with the FPA.
See *Note Sun Install::, for information on installing GNU CC on
Sun systems.
`m88k-*-svr3'
Motorola m88k running the AT&T/Unisoft/Motorola V.3 reference port.
These systems tend to use the Green Hills C, revision 1.8.5, as the
standard C compiler. There are apparently bugs in this compiler
that result in object files differences between stage 2 and stage
3. If this happens, make the stage 4 compiler and compare it to
the stage 3 compiler. If the stage 3 and stage 4 object files are
identical, this suggests you encountered a problem with the
standard C compiler; the stage 3 and 4 compilers may be usable.
It is best, however, to use an older version of GNU CC for
bootstrapping if you have one.
`m88k-*-dgux'
Motorola m88k running DG/UX. To build 88open BCS native or cross
compilers on DG/UX, specify the configuration name as
`m88k-*-dguxbcs' and build in the 88open BCS software development
environment. To build ELF native or cross compilers on DG/UX,
specify `m88k-*-dgux' and build in the DG/UX ELF development
environment. You set the software development environment by
issuing `sde-target' command and specifying either `m88kbcs' or
`m88kdguxelf' as the operand.
If you do not specify a configuration name, `configure' guesses the
configuration based on the current software development
environment.
`m88k-tektronix-sysv3'
Tektronix XD88 running UTekV 3.2e. Do not turn on optimization
while building stage1 if you bootstrap with the buggy Green Hills
compiler. Also, The bundled LAI System V NFS is buggy so if you
build in an NFS mounted directory, start from a fresh reboot, or
avoid NFS all together. Otherwise you may have trouble getting
clean comparisons between stages.
`mips-mips-bsd'
MIPS machines running the MIPS operating system in BSD mode. It's
possible that some old versions of the system lack the functions
`memcpy', `memcmp', and `memset'. If your system lacks these, you
must remove or undo the definition of `TARGET_MEM_FUNCTIONS' in
`mips-bsd.h'.
The MIPS C compiler needs to be told to increase its table size
for switch statements with the `-Wf,-XNg1500' option in order to
compile `cp/parse.c'. If you use the `-O2' optimization option,
you also need to use `-Olimit 3000'. Both of these options are
automatically generated in the `Makefile' that the shell script
`configure' builds. If you override the `CC' make variable and
use the MIPS compilers, you may need to add `-Wf,-XNg1500 -Olimit
3000'.
`mips-mips-riscos*'
The MIPS C compiler needs to be told to increase its table size
for switch statements with the `-Wf,-XNg1500' option in order to
compile `cp/parse.c'. If you use the `-O2' optimization option,
you also need to use `-Olimit 3000'. Both of these options are
automatically generated in the `Makefile' that the shell script
`configure' builds. If you override the `CC' make variable and
use the MIPS compilers, you may need to add `-Wf,-XNg1500 -Olimit
3000'.
MIPS computers running RISC-OS can support four different
personalities: default, BSD 4.3, System V.3, and System V.4 (older
versions of RISC-OS don't support V.4). To configure GCC for
these platforms use the following configurations:
`mips-mips-riscos`rev''
Default configuration for RISC-OS, revision `rev'.
`mips-mips-riscos`rev'bsd'
BSD 4.3 configuration for RISC-OS, revision `rev'.
`mips-mips-riscos`rev'sysv4'
System V.4 configuration for RISC-OS, revision `rev'.
`mips-mips-riscos`rev'sysv'
System V.3 configuration for RISC-OS, revision `rev'.
The revision `rev' mentioned above is the revision of RISC-OS to
use. You must reconfigure GCC when going from a RISC-OS revision
4 to RISC-OS revision 5. This has the effect of avoiding a linker
bug (see *Note Installation Problems::, for more details).
`mips-sgi-*'
In order to compile GCC on an SGI running IRIX 4, the "c.hdr.lib"
option must be installed from the CD-ROM supplied from Silicon
Graphics. This is found on the 2nd CD in release 4.0.1.
In order to compile GCC on an SGI running IRIX 5, the
"compiler_dev.hdr" subsystem must be installed from the IDO CD-ROM
supplied by Silicon Graphics.
`make compare' may fail on version 5 of IRIX unless you add
`-save-temps' to `CFLAGS'. On these systems, the name of the
assembler input file is stored in the object file, and that makes
comparison fail if it differs between the `stage1' and `stage2'
compilations. The option `-save-temps' forces a fixed name to be
used for the assembler input file, instead of a randomly chosen
name in `/tmp'. Do not add `-save-temps' unless the comparisons
fail without that option. If you do you `-save-temps', you will
have to manually delete the `.i' and `.s' files after each series
of compilations.
The MIPS C compiler needs to be told to increase its table size
for switch statements with the `-Wf,-XNg1500' option in order to
compile `cp/parse.c'. If you use the `-O2' optimization option,
you also need to use `-Olimit 3000'. Both of these options are
automatically generated in the `Makefile' that the shell script
`configure' builds. If you override the `CC' make variable and
use the MIPS compilers, you may need to add `-Wf,-XNg1500 -Olimit
3000'.
On Irix version 4.0.5F, and perhaps on some other versions as well,
there is an assembler bug that reorders instructions incorrectly.
To work around it, specify the target configuration
`mips-sgi-irix4loser'. This configuration inhibits assembler
optimization.
In a compiler configured with target `mips-sgi-irix4', you can turn
off assembler optimization by using the `-noasmopt' option. This
compiler option passes the option `-O0' to the assembler, to
inhibit reordering.
The `-noasmopt' option can be useful for testing whether a problem
is due to erroneous assembler reordering. Even if a problem does
not go away with `-noasmopt', it may still be due to assembler
reordering--perhaps GNU CC itself was miscompiled as a result.
To enable debugging under Irix 5, you must use GNU as 2.5 or later,
and use the `--with-gnu-as' configure option when configuring gcc.
GNU as is distributed as part of the binutils package.
`mips-sony-sysv'
Sony MIPS NEWS. This works in NEWSOS 5.0.1, but not in 5.0.2
(which uses ELF instead of COFF). Support for 5.0.2 will probably
be provided soon by volunteers. In particular, the linker does
not like the code generated by GCC when shared libraries are
linked in.
`ns32k-encore'
Encore ns32000 system. Encore systems are supported only under
BSD.
`ns32k-*-genix'
National Semiconductor ns32000 system. Genix has bugs in `alloca'
and `malloc'; you must get the compiled versions of these from GNU
Emacs.
`ns32k-sequent'
Go to the Berkeley universe before compiling.
`ns32k-utek'
UTEK ns32000 system ("merlin"). The C compiler that comes with
this system cannot compile GNU CC; contact `tektronix!reed!mason'
to get binaries of GNU CC for bootstrapping.
`romp-*-aos'
`romp-*-mach'
The only operating systems supported for the IBM RT PC are AOS and
MACH. GNU CC does not support AIX running on the RT. We
recommend you compile GNU CC with an earlier version of itself; if
you compile GNU CC with `hc', the Metaware compiler, it will work,
but you will get mismatches between the stage 2 and stage 3
compilers in various files. These errors are minor differences in
some floating-point constants and can be safely ignored; the stage
3 compiler is correct.
`rs6000-*-aix'
`powerpc-*-aix'
Various early versions of each release of the IBM XLC compiler
will not bootstrap GNU CC. Symptoms include differences between
the stage2 and stage3 object files, and errors when compiling
`libgcc.a' or `enquire'. Known problematic releases include:
xlc-1.2.1.8, xlc-1.3.0.0 (distributed with AIX 3.2.5), and
xlc-1.3.0.19. Both xlc-1.2.1.28 and xlc-1.3.0.24 (PTF 432238) are
known to produce working versions of GNU CC, but most other recent
releases correctly bootstrap GNU CC. Also, releases of AIX prior
to AIX 3.2.4 include a version of the IBM assembler which does not
accept debugging directives: assembler updates are available as
PTFs. Also, if you are using AIX 3.2.5 or greater and the GNU
assembler, you must have a version modified after October 16th,
1995 in order for the GNU C compiler to build. See the file
`README.RS6000' for more details on of these problems.
GNU CC does not yet support the 64-bit PowerPC instructions.
Objective C does not work on this architecture because it makes
assumptions that are incompatible with the calling conventions.
AIX on the RS/6000 provides support (NLS) for environments outside
of the United States. Compilers and assemblers use NLS to support
locale-specific representations of various objects including
floating-point numbers ("." vs "," for separating decimal
fractions). There have been problems reported where the library
linked with GNU CC does not produce the same floating-point
formats that the assembler accepts. If you have this problem, set
the LANG environment variable to "C" or "En_US".
Due to changes in the way that GNU CC invokes the binder (linker)
for AIX 4.1, you may now receive warnings of duplicate symbols
from the link step that were not reported before. The assembly
files generated by GNU CC for AIX have always included multiple
symbol definitions for certain global variable and function
declarations in the original program. The warnings should not
prevent the linker from producing a correct library or runnable
executable.
By default, AIX 4.1 produces code that can be used on either Power
or PowerPC processors.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpc-*-elf'
`powerpc-*-sysv4'
PowerPC system in big endian mode, running System V.4.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpc-*-linux-gnu'
PowerPC system in big endian mode, running the Linux-based GNU
system.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpc-*-eabiaix'
Embedded PowerPC system in big endian mode with -mcall-aix
selected as the default.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpc-*-eabisim'
Embedded PowerPC system in big endian mode for use in running
under the PSIM simulator.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpc-*-eabi'
Embedded PowerPC system in big endian mode.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpcle-*-elf'
`powerpcle-*-sysv4'
PowerPC system in little endian mode, running System V.4.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpcle-*-solaris2*'
PowerPC system in little endian mode, running Solaris 2.5.1 or
higher.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE. Beta
versions of the Sun 4.0 compiler do not seem to be able to build
GNU CC correctly. There are also problems with the host assembler
and linker that are fixed by using the GNU versions of these tools.
`powerpcle-*-eabisim'
Embedded PowerPC system in little endian mode for use in running
under the PSIM simulator.
`powerpcle-*-eabi'
Embedded PowerPC system in little endian mode.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`powerpcle-*-winnt'
`powerpcle-*-pe'
PowerPC system in little endian mode running Windows NT.
You can specify a default version for the `-mcpu='CPU_TYPE switch
by using the configure option `--with-cpu-'CPU_TYPE.
`vax-dec-ultrix'
Don't try compiling with Vax C (`vcc'). It produces incorrect code
in some cases (for example, when `alloca' is used).
Meanwhile, compiling `cp/parse.c' with pcc does not work because of
an internal table size limitation in that compiler. To avoid this
problem, compile just the GNU C compiler first, and use it to
recompile building all the languages that you want to run.
`sparc-sun-*'
See *Note Sun Install::, for information on installing GNU CC on
Sun systems.
`vax-dec-vms'
See *Note VMS Install::, for details on how to install GNU CC on
VMS.
`we32k-*-*'
These computers are also known as the 3b2, 3b5, 3b20 and other
similar names. (However, the 3b1 is actually a 68000; see *Note
Configurations::.)
Don't use `-g' when compiling with the system's compiler. The
system's linker seems to be unable to handle such a large program
with debugging information.
The system's compiler runs out of capacity when compiling `stmt.c'
in GNU CC. You can work around this by building `cpp' in GNU CC
first, then use that instead of the system's preprocessor with the
system's C compiler to compile `stmt.c'. Here is how:
mv /lib/cpp /lib/cpp.att
cp cpp /lib/cpp.gnu
echo '/lib/cpp.gnu -traditional ${1+"$@"}' > /lib/cpp
chmod +x /lib/cpp
The system's compiler produces bad code for some of the GNU CC
optimization files. So you must build the stage 2 compiler without
optimization. Then build a stage 3 compiler with optimization.
That executable should work. Here are the necessary commands:
make LANGUAGES=c CC=stage1/xgcc CFLAGS="-Bstage1/ -g"
make stage2
make CC=stage2/xgcc CFLAGS="-Bstage2/ -g -O"
You may need to raise the ULIMIT setting to build a C++ compiler,
as the file `cc1plus' is larger than one megabyte.

File: gcc.info, Node: Other Dir, Next: Cross-Compiler, Prev: Configurations, Up: Installation
Compilation in a Separate Directory
===================================
If you wish to build the object files and executables in a directory
other than the one containing the source files, here is what you must
do differently:
1. Make sure you have a version of Make that supports the `VPATH'
feature. (GNU Make supports it, as do Make versions on most BSD
systems.)
2. If you have ever run `configure' in the source directory, you must
undo the configuration. Do this by running:
make distclean
3. Go to the directory in which you want to build the compiler before
running `configure':
mkdir gcc-sun3
cd gcc-sun3
On systems that do not support symbolic links, this directory must
be on the same file system as the source code directory.
4. Specify where to find `configure' when you run it:
../gcc/configure ...
This also tells `configure' where to find the compiler sources;
`configure' takes the directory from the file name that was used to
invoke it. But if you want to be sure, you can specify the source
directory with the `--srcdir' option, like this:
../gcc/configure --srcdir=../gcc OTHER OPTIONS
The directory you specify with `--srcdir' need not be the same as
the one that `configure' is found in.
Now, you can run `make' in that directory. You need not repeat the
configuration steps shown above, when ordinary source files change. You
must, however, run `configure' again when the configuration files
change, if your system does not support symbolic links.

File: gcc.info, Node: Cross-Compiler, Next: Sun Install, Prev: Other Dir, Up: Installation
Building and Installing a Cross-Compiler
========================================
GNU CC can function as a cross-compiler for many machines, but not
all.
* Cross-compilers for the Mips as target using the Mips assembler
currently do not work, because the auxiliary programs
`mips-tdump.c' and `mips-tfile.c' can't be compiled on anything
but a Mips. It does work to cross compile for a Mips if you use
the GNU assembler and linker.
* Cross-compilers between machines with different floating point
formats have not all been made to work. GNU CC now has a floating
point emulator with which these can work, but each target machine
description needs to be updated to take advantage of it.
* Cross-compilation between machines of different word sizes is
somewhat problematic and sometimes does not work.
Since GNU CC generates assembler code, you probably need a
cross-assembler that GNU CC can run, in order to produce object files.
If you want to link on other than the target machine, you need a
cross-linker as well. You also need header files and libraries suitable
for the target machine that you can install on the host machine.
* Menu:
* Steps of Cross:: Using a cross-compiler involves several steps
that may be carried out on different machines.
* Configure Cross:: Configuring a cross-compiler.
* Tools and Libraries:: Where to put the linker and assembler, and the C library.
* Cross Headers:: Finding and installing header files
for a cross-compiler.
* Cross Runtime:: Supplying arithmetic runtime routines (`libgcc1.a').
* Build Cross:: Actually compiling the cross-compiler.

File: gcc.info, Node: Steps of Cross, Next: Configure Cross, Up: Cross-Compiler
Steps of Cross-Compilation
--------------------------
To compile and run a program using a cross-compiler involves several
steps:
* Run the cross-compiler on the host machine to produce assembler
files for the target machine. This requires header files for the
target machine.
* Assemble the files produced by the cross-compiler. You can do this
either with an assembler on the target machine, or with a
cross-assembler on the host machine.
* Link those files to make an executable. You can do this either
with a linker on the target machine, or with a cross-linker on the
host machine. Whichever machine you use, you need libraries and
certain startup files (typically `crt....o') for the target
machine.
It is most convenient to do all of these steps on the same host
machine, since then you can do it all with a single invocation of GNU
CC. This requires a suitable cross-assembler and cross-linker. For
some targets, the GNU assembler and linker are available.

File: gcc.info, Node: Configure Cross, Next: Tools and Libraries, Prev: Steps of Cross, Up: Cross-Compiler
Configuring a Cross-Compiler
----------------------------
To build GNU CC as a cross-compiler, you start out by running
`configure'. Use the `--target=TARGET' to specify the target type. If
`configure' was unable to correctly identify the system you are running
on, also specify the `--build=BUILD' option. For example, here is how
to configure for a cross-compiler that produces code for an HP 68030
system running BSD on a system that `configure' can correctly identify:
./configure --target=m68k-hp-bsd4.3

File: gcc.info, Node: Tools and Libraries, Next: Cross Headers, Prev: Configure Cross, Up: Cross-Compiler
Tools and Libraries for a Cross-Compiler
----------------------------------------
If you have a cross-assembler and cross-linker available, you should
install them now. Put them in the directory `/usr/local/TARGET/bin'.
Here is a table of the tools you should put in this directory:
`as'
This should be the cross-assembler.
`ld'
This should be the cross-linker.
`ar'
This should be the cross-archiver: a program which can manipulate
archive files (linker libraries) in the target machine's format.
`ranlib'
This should be a program to construct a symbol table in an archive
file.
The installation of GNU CC will find these programs in that
directory, and copy or link them to the proper place to for the
cross-compiler to find them when run later.
The easiest way to provide these files is to build the Binutils
package and GAS. Configure them with the same `--host' and `--target'
options that you use for configuring GNU CC, then build and install
them. They install their executables automatically into the proper
directory. Alas, they do not support all the targets that GNU CC
supports.
If you want to install libraries to use with the cross-compiler,
such as a standard C library, put them in the directory
`/usr/local/TARGET/lib'; installation of GNU CC copies all the files in
that subdirectory into the proper place for GNU CC to find them and
link with them. Here's an example of copying some libraries from a
target machine:
ftp TARGET-MACHINE
lcd /usr/local/TARGET/lib
cd /lib
get libc.a
cd /usr/lib
get libg.a
get libm.a
quit
The precise set of libraries you'll need, and their locations on the
target machine, vary depending on its operating system.
Many targets require "start files" such as `crt0.o' and `crtn.o'
which are linked into each executable; these too should be placed in
`/usr/local/TARGET/lib'. There may be several alternatives for
`crt0.o', for use with profiling or other compilation options. Check
your target's definition of `STARTFILE_SPEC' to find out what start
files it uses. Here's an example of copying these files from a target
machine:
ftp TARGET-MACHINE
lcd /usr/local/TARGET/lib
prompt
cd /lib
mget *crt*.o
cd /usr/lib
mget *crt*.o
quit