install

gcc库的原代码,对编程有很大帮助.

     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 `[e-mail]'.

`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.

`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.  In addition, you
     probably need to create a file named `string.h' containing just
     one line: `#include <strings.h>'.

`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.

`powerpc-*-elf'
`powerpc-*-sysv4'
     PowerPC system in big endian mode, running System V.4.

     This configuration is currently under development.

`powerpc-*-eabiaix'
     Embedded PowerPC system in big endian mode with -mcall-aix
     selected as the default.  This system is currently under
     development.

`powerpc-*-eabisim'
     Embedded PowerPC system in big endian mode for use in running
     under the PSIM simulator.  This system is currently under
     development.

`powerpc-*-eabi'
     Embedded PowerPC system in big endian mode.

     This configuration is currently under development.

`powerpcle-*-elf'
`powerpcle-*-sysv4'
     PowerPC system in little endian mode, running System V.4.

     This configuration is currently under development.