Browse Source

Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the

non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
pull/132/head
Peter Wemm 26 years ago
commit
a4cd5630b0
  1. 23
      contrib/gcc/BUGS
  2. 339
      contrib/gcc/COPYING
  3. 482
      contrib/gcc/COPYING.LIB
  4. 5684
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  5. 2538
      contrib/gcc/Makefile.in
  6. 735
      contrib/gcc/NEWS
  7. 3757
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  8. 117
      contrib/gcc/PROBLEMS
  9. 448
      contrib/gcc/PROJECTS
  10. 26
      contrib/gcc/README
  11. 9
      contrib/gcc/README-fixinc
  12. 18
      contrib/gcc/README.ACORN
  13. 55
      contrib/gcc/README.ALTOS
  14. 112
      contrib/gcc/README.APOLLO
  15. 574
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  16. 17
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  19. 55
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  20. 447
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  21. 852
      contrib/gcc/SERVICE
  22. 39
      contrib/gcc/TESTS.FLUNK
  23. 492
      contrib/gcc/alloca.c
  24. 54
      contrib/gcc/assert.h
  25. 69
      contrib/gcc/basic-block.h
  26. 992
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  27. 133
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  28. 789
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  29. 75
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  30. 21
      contrib/gcc/bc-typecd.def
  31. 54
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  32. 80
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  33. 48
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  34. 167
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  35. 78
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  36. 59
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  37. 169
      contrib/gcc/bi-parser.y
  38. 61
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  39. 159
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  40. 32
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  41. 322
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  42. 81
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  43. 35
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  44. 644
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  45. 2255
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  46. 96
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  47. 6967
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  53. 2900
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  65. 116
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  66. 565
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  67. 867
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  68. 5
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  69. 88
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  70. 1352
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  71. 30
      contrib/gcc/config/gnu.h
  72. 96
      contrib/gcc/config/gofast.h
  73. 81
      contrib/gcc/config/i386/386bsd.h
  74. 69
      contrib/gcc/config/i386/aix386.h
  75. 143
      contrib/gcc/config/i386/aix386ng.h
  76. 106
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  77. 130
      contrib/gcc/config/i386/bsd.h
  78. 18
      contrib/gcc/config/i386/bsd386.h
  79. 38
      contrib/gcc/config/i386/config-nt.sed
  80. 256
      contrib/gcc/config/i386/freebsd.h
  81. 256
      contrib/gcc/config/i386/freebsd.h.fixed
  82. 155
      contrib/gcc/config/i386/gas.h
  83. 20
      contrib/gcc/config/i386/gnu.h
  84. 64
      contrib/gcc/config/i386/go32.h
  85. 9
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  86. 34
      contrib/gcc/config/i386/i386-aout.h
  87. 97
      contrib/gcc/config/i386/i386-coff.h
  88. 3245
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  89. 1934
      contrib/gcc/config/i386/i386.h
  90. 5775
      contrib/gcc/config/i386/i386.md
  91. 67
      contrib/gcc/config/i386/i386iscgas.h
  92. 89
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  93. 12
      contrib/gcc/config/i386/isccoff.h
  94. 43
      contrib/gcc/config/i386/iscdbx.h
  95. 76
      contrib/gcc/config/i386/linux-aout.h
  96. 76
      contrib/gcc/config/i386/linux-oldld.h
  97. 212
      contrib/gcc/config/i386/linux.h
  98. 37
      contrib/gcc/config/i386/lynx-ng.h
  99. 39
      contrib/gcc/config/i386/lynx.h
  100. 20
      contrib/gcc/config/i386/mach.h
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23
contrib/gcc/BUGS

@ -0,0 +1,23 @@
If you think you may have found a bug in GNU CC, please
read the Bugs section of the Emacs manual for advice on
(1) how to tell when to report a bug,
(2) where to send your bug report, and
(2) how to write a useful bug report and what information
it needs to have.
There are three ways to read the Bugs section.
(1) In a printed copy of the GCC manual. You can order one from the
Free Software Foundation; see the file ORDERS. But if you don't have
a copy on hand and you think you have found a bug, you shouldn't wait
to get a printed manual; you should read the section right away as
described below.
(2) With Info. Start Emacs, do C-h i to enter Info,
then m gcc RET to get to the GCC manual, then m Bugs RET
to get to the section on bugs. Or use standalone Info in
a like manner. (Standalone Info is part of the Texinfo distribution.)
(3) By hand. Search for the chapter "Reporting Bugs" in gcc.texi, or
cat /usr/local/info/gcc* | more "+/^File: emacs, Node: Bugs,"

339
contrib/gcc/COPYING

@ -0,0 +1,339 @@
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.
Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
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c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
a warranty) and that users may redistribute the program under
these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
the scope of this License.
3. You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of
Sections 1 and 2 above provided that you also do one of the following:
a) Accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of Sections
1 and 2 above on a medium customarily used for software interchange; or,
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years, to give any third party, for a charge no more than your
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license would not permit royalty-free redistribution of the Program by
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It is not the purpose of this section to induce you to infringe any
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through that system in reliance on consistent application of that
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to distribute software through any other system and a licensee cannot
impose that choice.
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded. In such case, this License incorporates
the limitation as if written in the body of this License.
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of the General Public License from time to time. Such new versions will
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Each version is given a distinguishing version number. If the Program
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either of that version or of any later version published by the Free
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Foundation.
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NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.
12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
Appendix: How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) 19yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

482
contrib/gcc/COPYING.LIB

@ -0,0 +1,482 @@
GNU LIBRARY GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1991 Free Software Foundation, Inc.
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
[This is the first released version of the library GPL. It is
numbered 2 because it goes with version 2 of the ordinary GPL.]
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
Licenses are intended to guarantee your freedom to share and change
free software--to make sure the software is free for all its users.
This license, the Library General Public License, applies to some
specially designated Free Software Foundation software, and to any
other libraries whose authors decide to use it. You can use it for
your libraries, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if
you distribute copies of the library, or if you modify it.
For example, if you distribute copies of the library, whether gratis
or for a fee, you must give the recipients all the rights that we gave
you. You must make sure that they, too, receive or can get the source
code. If you link a program with the library, you must provide
complete object files to the recipients so that they can relink them
with the library, after making changes to the library and recompiling
it. And you must show them these terms so they know their rights.
Our method of protecting your rights has two steps: (1) copyright
the library, and (2) offer you this license which gives you legal
permission to copy, distribute and/or modify the library.
Also, for each distributor's protection, we want to make certain
that everyone understands that there is no warranty for this free
library. If the library is modified by someone else and passed on, we
want its recipients to know that what they have is not the original
version, so that any problems introduced by others will not reflect on
the original authors' reputations.
Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that companies distributing free
software will individually obtain patent licenses, thus in effect
transforming the program into proprietary software. To prevent this,
we have made it clear that any patent must be licensed for everyone's
free use or not licensed at all.
Most GNU software, including some libraries, is covered by the ordinary
GNU General Public License, which was designed for utility programs. This
license, the GNU Library General Public License, applies to certain
designated libraries. This license is quite different from the ordinary
one; be sure to read it in full, and don't assume that anything in it is
the same as in the ordinary license.
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However, unrestricted linking of non-free programs would deprive the
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The precise terms and conditions for copying, distribution and
modification follow. Pay close attention to the difference between a
"work based on the library" and a "work that uses the library". The
former contains code derived from the library, while the latter only
works together with the library.
Note that it is possible for a library to be covered by the ordinary
General Public License rather than by this special one.
GNU LIBRARY GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License Agreement applies to any software library which
contains a notice placed by the copyright holder or other authorized
party saying it may be distributed under the terms of this Library
General Public License (also called "this License"). Each licensee is
addressed as "you".
A "library" means a collection of software functions and/or data
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Appendix: How to Apply These Terms to Your New Libraries
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This library is free software; you can redistribute it and/or
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Yoyodyne, Inc., hereby disclaims all copyright interest in the
library `Frob' (a library for tweaking knobs) written by James Random Hacker.
<signature of Ty Coon>, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!

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Noteworthy changes in GCC version 2.7.2:
A few bugs have been fixed (most notably the generation of an
invalid assembler opcode on some RS/6000 systems).
Noteworthy changes in GCC version 2.7.1:
This release fixes numerous bugs (mostly minor) in GCC 2.7.0, but
also contains a few new features, mostly related to specific targets.
Major changes have been made in code to support Windows NT.
The following new targets are supported:
2.9 BSD on PDP-11
Linux on m68k
HP/UX version 10 on HP PA RISC (treated like version 9)
DEC Alpha running Windows NT
When parsing C, GCC now recognizes C++ style `//' comments unless you
specify `-ansi' or `-traditional'.
The PowerPC System V targets (powerpc-*-sysv, powerpc-*-eabi) now use the
calling sequence specified in the System V Application Binary Interface
Processor Supplement (PowerPC Processor ABI Supplement) rather than the calling
sequence used in GCC version 2.7.0. That calling sequence was based on the AIX
calling sequence without function descriptors. To compile code for that older
calling sequence, either configure the compiler for powerpc-*-eabiaix or use
the -mcall-aix switch when compiling and linking.
Noteworthy changes in GCC version 2.7.0:
GCC now works better on systems that use ".obj" and ".exe" instead of
".o" and no extension. This involved changes to the driver program,
gcc.c, to convert ".o" names to ".obj" and to GCC's Makefile to use
".obj" and ".exe" in filenames that are not targets. In order to
build GCC on such systems, you may need versions of GNU make and/or
compatible shells. At this point, this support is preliminary.
Object file extensions of ".obj" and executable file extensions of
".exe" are allowed when using appropriate version of GNU Make.
Numerous enhancements were made to the __attribute__ facility including
more attributes and more places that support it. We now support the
"packed", "nocommon", "noreturn", "volatile", "const", "unused",
"transparent_union", "constructor", "destructor", "mode", "section",
"align", "format", "weak", and "alias" attributes. Each of these
names may also be specified with added underscores, e.g., "__packed__".
__attribute__ may now be applied to parameter definitions, function
definitions, and structure, enum, and union definitions.
GCC now supports returning more structures in registers, as specified by
many calling sequences (ABIs), such as on the HP PA RISC.
A new option '-fpack-struct' was added to automatically pack all structure
members together without holes.
There is a new library (cpplib) and program (cppmain) that at some
point will replace cpp (aka cccp). To use cppmain as cpp now, pass
the option CCCP=cppmain to make. The library is already used by the
fix-header program, which should speed up the fixproto script.
New options for supported targets:
GNU on many targets.
NetBSD on MIPS, m68k, VAX, and x86.
LynxOS on x86, m68k, Sparc, and RS/6000.
VxWorks on many targets.
Windows/NT on x86 architecture. Initial support for Windows/NT on Alpha
(not fully working).
Many embedded targets, specifically UDI on a29k, aout, coff, elf,
and vsta "operating systems" on m68k, m88k, mips, sparc, and x86.
Additional support for x86 (i386, i486, and Pentium):
Work with old and new linkers for Linux-based GNU systems,
supporting both a.out and ELF.
FreeBSD on x86.
Stdcall convention.
-malign-double, -mregparm=, -malign-loops= and -malign-jumps= switches.
On ISC systems, support -Xp like -posix.
Additions for RS/6000:
Instruction scheduling information for PowerPC 403.
AIX 4.1 on PowerPC.
-mstring and -mno-string.
-msoft-float and floating-point emulation included.
Preliminary support for PowerPC System V.4 with or without the GNU as.
Preliminary support for EABI.
Preliminary support for 64-bit systems.
Both big and little endian systems.
New features for MIPS-based systems:
r4650.
mips4 and R8000.
Irix 6.0.
64-bit ABI.
Allow dollar signs in labels on SGI/Irix 5.x.
New support for HP PA RISC:
Generation of PIC (requires binutils-2.5.2.u6 or later).
HP-UX version 9 on HP PA RISC (dynamically links even with -g).
Processor variants for HP PA RISC: 700, 7100, and 7100LC.
Automatic generation of long calls when needed.
-mfast-indirect-calls for kernels and static binaries.
The called routine now copies arguments passed by invisible reference,
as required by the calling standard.
Other new miscellaneous target-specific support:
-mno-multm on a29k.
-mold-align for i960.
Configuration for "semi-hosted" ARM.
-momit-leaf-frame-pointer for M88k.
SH3 variant of Hitachi Super-H and support both big and little endian.
Changes to Objective-C:
Bare-bones implementation of NXConstantString has been added,
which is invoked by the @"string" directive.
Class * has been changed to Class to conform to the NextSTEP and
OpenStep runtime.
Enhancements to make dynamic loading easier.
The module version number has been updated to Version 7, thus existing
code will need to be recompiled to use the current run-time library.
GCC now supports the ISO Normative Addendum 1 to the C Standard.
As a result:
The header <iso646.h> defines macros for C programs written
in national variants of ISO 646.
The following digraph tokens are supported:
<: :> <% %> %: %:%:
These behave like the following, respectively:
[ ] { } # ##
Digraph tokens are supported unless you specify the `-traditional'
option; you do not need to specify `-ansi' or `-trigraphs'. Except
for contrived and unlikely examples involving preprocessor
stringizing, digraph interpretation doesn't change the meaning of
programs; this is unlike trigraph interpretation, which changes the
meanings of relatively common strings.
The macro __STDC_VERSION__ has the value 199409L.
As usual, for full conformance to the standard, you also need a
C library that conforms.
The following lists changes that have been made to g++. If some
features mentioned below sound unfamiliar, you will probably want to
look at the recently-released public review copy of the C++ Working
Paper. For PostScript and PDF (Adobe Acrobat) versions, see the
archive at ftp://research.att.com/dist/stdc++/WP. For HTML and ASCII
versions, see ftp://ftp.cygnus.com/pub/g++. On the web, see
http://www.cygnus.com/~mrs/wp-draft.
The scope of variables declared in the for-init-statement has been changed
to conform to http://www.cygnus.com/~mrs/wp-draft/stmt.html#stmt.for; as a
result, packages such as groff 1.09 will not compile unless you specify the
-fno-for-scope flag. PLEASE DO NOT REPORT THIS AS A BUG; this is a change
mandated by the C++ standardization committee.
Binary incompatibilities:
The builtin 'bool' type is now the size of a machine word on RISC targets,
for code efficiency; it remains one byte long on CISC targets.
Code that does not use #pragma interface/implementation will most
likely shrink dramatically, as g++ now only emits the vtable for a
class in the translation unit where its first non-inline, non-abstract
virtual function is defined.
Classes that do not define the copy constructor will sometimes be
passed and returned in registers. This may illuminate latent bugs in
your code.
Support for automatic template instantiation has *NOT* been added, due
to a disagreement over design philosophies.
Support for exception handling has been improved; more targets are now
supported, and throws will use the RTTI mechanism to match against the
catch parameter type. Optimization is NOT SUPPORTED with
-fhandle-exceptions; no need to report this as a bug.
Support for Run-Time Type Identification has been added with -frtti.
This support is still in alpha; one major restriction is that any file
compiled with -frtti must include <typeinfo.h>.
Preliminary support for namespaces has been added. This support is far
from complete, and probably not useful.
Synthesis of compiler-generated constructors, destructors and
assignment operators is now deferred until the functions are used.
The parsing of expressions such as `a ? b : c = 1' has changed from
`(a ? b : c) = 1' to `a : b ? (c = 1)'.
The code generated for testing conditions, especially those using ||
and &&, is now more efficient.
The operator keywords and, and_eq, bitand, bitor, compl, not, not_eq,
or, or_eq, xor and xor_eq are now supported. Use -ansi or
-foperator-names to enable them.
The 'explicit' keyword is now supported. 'explicit' is used to mark
constructors and type conversion operators that should not be used
implicitly.
g++ now accepts the typename keyword, though it currently has no
semantics; it can be a no-op in the current template implementation.
You may want to start using it in your code, however, since the
pending rewrite of the template implementation to compile STL properly
(perhaps for 2.8.0, perhaps not) will require you to use it as
indicated by the current draft.
Handling of user-defined type conversion has been overhauled so that
type conversion operators are now found and used properly in
expressions and function calls.
-fno-strict-prototype now only applies to function declarations with
"C" linkage.
g++ now warns about 'if (x=0)' with -Wparentheses or -Wall.
#pragma weak and #pragma pack are supported on System V R4 targets, as
are various other target-specific #pragmas supported by gcc.
new and delete of const types is now allowed (with no additional
semantics).
Explicit instantiation of template methods is now supported. Also,
'inline template class foo<int>;' can be used to emit only the vtable
for a template class.
With -fcheck-new, g++ will check the return value of all calls to
operator new, and not attempt to modify a returned null pointer.
The template instantiation code now handles more conversions when
passing to a parameter that does not depend on template arguments.
This means that code like 'string s; cout << s;' now works.
Invalid jumps in a switch statement past declarations that require
initializations are now caught.
Functions declared 'extern inline' now have the same linkage semantics
as inline member functions. On supported targets, where previously
these functions (and vtables, and template instantiations) would have
been defined statically, they will now be defined as weak symbols so
that only one out-of-line definition is used.
collect2 now demangles linker output, and c++filt has become part of
the gcc distribution.
Noteworthy changes in GCC version 2.6.3:
A few more bugs have been fixed.
Noteworthy changes in GCC version 2.6.2:
A few bugs have been fixed.
Names of attributes can now be preceded and followed by double underscores.
Noteworthy changes in GCC version 2.6.1:
Numerous (mostly minor) bugs have been fixed.
The following new configurations are supported:
GNU on x86 (instead of treating it like MACH)
NetBSD on Sparc and Motorola 68k
AIX 4.1 on RS/6000 and PowerPC systems
Sequent DYNUX/ptx 1.x and 2.x.
Both COFF and ELF configurations on AViiON without using /bin/gcc
Windows/NT on x86 architecture; preliminary
AT&T DSP1610 digital signal processor chips
i960 systems on bare boards using COFF
PDP11; target only and not extensively tested
The -pg option is now supported for Alpha under OSF/1 V3.0 or later.
Files with an extension of ".c++" are treated as C++ code.
The -Xlinker and -Wl arguments are now passed to the linker in the
position they were specified on the command line. This makes it
possible, for example, to pass flags to the linker about specific
object files.
The use of positional arguments to the configure script is no longer
recommended. Use --target= to specify the target; see the GCC manual.
The 386 now supports two new switches: -mreg-alloc=<string> changes
the default register allocation order used by the compiler, and
-mno-wide-multiply disables the use of the mul/imul instructions that
produce 64 bit results in EAX:EDX from 32 bit operands to do long long
multiplies and 32-bit division by constants.
Noteworthy changes in GCC version 2.6.0:
Numerous bugs have been fixed, in the C and C++ front-ends, as
well as in the common compiler code.
This release includes the C, Objective-C, and C++ compilers. However,
we have moved the files for the C++ compiler (G++) files to a
subdirectory, cp. Subsequent releases of GCC will split these files
to a separate TAR file.
The G++ team has been tracking the development of the ANSI standard for C++.
Here are some new features added from the latest working paper:
* built-in boolean type 'bool', with constants 'true' and 'false'.
* array new and delete (operator new [] and delete []).
* WP-conforming lifetime of temporaries.
* explicit instantiation of templates (template class A<int>;),
along with an option (-fno-implicit-templates) to disable emission
of implicitly instantiated templates, obsoletes -fexternal-templates.
* static member constants (static const int foo = 4; within the
class declaration).
Many error messages have been improved to tell the user more about the
problem. Conformance checking with -pedantic-errors has been
improved. G++ now compiles Fresco.
There is now an experimental implementation of virtual functions using
thunks instead of Cfront-style vtables, enabled with -fvtable-thunks.
This option also enables a heuristic which causes the compiler to only
emit the vtable in the translation unit where its first non-inline
virtual function is defined; using this option and
-fno-implicit-templates, users should be able to avoid #pragma
interface/implementation altogether.
Signatures have been added as a GNU C++ extension. Using the option
-fhandle-signatures, users are able to turn on recognition of
signatures. A short introduction on signatures is in the section
`Extension to the C++ Language' in the manual.
The `g++' program is now a C program, rather than a shell script.
Lots and lots and lots of bugs fixes, in nested types, access control,
pointers to member functions, the parser, templates, overload
resolution, etc, etc.
There have been two major enhancements to the Objective-C compiler:
1) Added portability. It now runs on Alpha, and some problems with
message forwarding have been addressed on other platforms.
2) Selectors have been redefined to be pointers to structs like:
{ void *sel_id, char *sel_types }, where the sel_id is the unique
identifier, the selector itself is no longer unique.
Programmers should use the new function sel_eq to test selector
equivalence.
The following major changes have been made to the base compiler and
machine-specific files.
- The MIL-STD-1750A is a new port, but still preliminary.
- The h8/300h is now supported; both the h8/300 and h8/300h ports come
with 32 bit IEEE 754 software floating point support.
- The 64-bit Sparc (v9) and 64-bit MIPS chips are supported.
- NetBSD is supported on m68k, Intel x86, and pc523 systems and FreeBSD
on x86.
- COFF is supported on x86, m68k, and Sparc systems running LynxOS.
- 68K systems from Bull and Concurrent are supported and System V
Release 4 is supported on the Atari.
- GCC supports GAS on the Motorola 3300 (sysV68) and debugging
(assuming GAS) on the Plexus 68K system. (However, GAS does not yet
work on those systems).
- System V Release 4 is supported on MIPS (Tandem).
- For DG/UX, an ELF configuration is now supported, and both the ELF
and BCS configurations support ELF and COFF object file formats.
- OSF/1 V2.0 is supported on Alpha.
- Function profiling is also supported on Alpha.
- GAS and GDB is supported for Irix 5 (MIPS).
- "common mode" (code that will run on both POWER and PowerPC
architectures) is now supported for the RS/6000 family; the
compiler knows about more PPC chips.
- Both NeXTStep 2.1 and 3 are supported on 68k-based architectures.
- On the AMD 29k, the -msoft-float is now supported, as well as
-mno-sum-in-toc for RS/6000, -mapp-regs and -mflat for Sparc, and
-membedded-pic for MIPS.
- GCC can now convert division by integer constants into the equivalent
multiplication and shift operations when that is faster than the
division.
- Two new warning options, -Wbad-function-cast and
-Wmissing-declarations have been added.
- Configurations may now add machine-specific __attribute__ options on
type; many machines support the `section' attribute.
- The -ffast-math flag permits some optimization that violate strict
IEEE rules, such as converting X * 0.0 to 0.0.
Noteworthy changes in GCC version 2.5.8:
This release only fixes a few serious bugs. These include fixes for a
bug that prevented most programs from working on the RS/6000, a bug
that caused invalid assembler code for programs with a `switch'
statement on the NS32K, a G++ problem that caused undefined names in
some configurations, and several less serious problems, some of which
can affect most configuration.
Noteworthy change in GCC version 2.5.7:
This release only fixes a few bugs, one of which was causing bootstrap
compare errors on some systems.
Noteworthy change in GCC version 2.5.6:
A few backend bugs have been fixed, some of which only occur on one
machine.
The C++ compiler in 2.5.6 includes:
* fixes for some common crashes
* correct handling of nested types that are referenced as `foo::bar'
* spurious warnings about friends being declared static and never
defined should no longer appear
* enums that are local to a method in a class, or a class that's
local to a function, are now handled correctly. For example:
class foo { void bar () { enum { x, y } E; x; } };
void bar () { class foo { enum { x, y } E; E baz; }; }
Noteworthy change in GCC version 2.5.5:
A large number of C++ bugs have been fixed.
The fixproto script adds prototypes conditionally on __cplusplus.
Noteworthy change in GCC version 2.5.4:
A bug fix in passing of structure arguments for the HP-PA architecture
makes code compiled with GCC 2.5.4 incompatible with code compiled
with earlier versions (if it passes struct arguments of 33 to 64 bits,
interspersed with other types of arguments).
Noteworthy change in gcc version 2.5.3:
The method of "mangling" C++ function names has been changed. So you
must recompile all C++ programs completely when you start using GCC
2.5. Also, GCC 2.5 requires libg++ version 2.5. Earlier libg++
versions won't work with GCC 2.5. (This is generally true--GCC
version M.N requires libg++ version M.N.)
Noteworthy GCC changes in version 2.5:
* There is now support for the IBM 370 architecture as a target.
Currently the only operating system supported is MVS; GCC does not run
on MVS, so you must produce .s files using GCC as a cross compiler,
then transfer them to MVS to assemble them. This port is not reliable
yet.
* The Power PC is now supported.
* The i860-based Paragon machine is now supported.
* The Hitachi 3050 (an HP-PA machine) is now supported.
* The variable __GNUC_MINOR__ holds the minor version number of GCC, as
an integer. For version 2.5.X, the value is 5.
* In C, initializers for static and global variables are now processed
an element at a time, so that they don't need a lot of storage.
* The C syntax for specifying which structure field comes next in an
initializer is now `.FIELDNAME='. The corresponding syntax for
array initializers is now `[INDEX]='. For example,
char whitespace[256]
= { [' '] = 1, ['\t'] = 1, ['\n'] = 1 };
This was changed to accord with the syntax proposed by the Numerical
C Extensions Group (NCEG).
* Complex numbers are now supported in C. Use the keyword __complex__
to declare complex data types. See the manual for details.
* GCC now supports `long double' meaningfully on the Sparc (128-bit
floating point) and on the 386 (96-bit floating point). The Sparc
support is enabled on on Solaris 2.x because earlier system versions
(SunOS 4) have bugs in the emulation.
* All targets now have assertions for cpu, machine and system. So you
can now use assertions to distinguish among all supported targets.
* Nested functions in C may now be inline. Just declare them inline
in the usual way.
* Packed structure members are now supported fully; it should be possible
to access them on any supported target, no matter how little alignment
they have.
* To declare that a function does not return, you must now write
something like this (works only in 2.5):
void fatal () __attribute__ ((noreturn));
or like this (works in older versions too):
typedef void voidfn ();
volatile voidfn fatal;
It used to be possible to do so by writing this:
volatile void fatal ();
but it turns out that ANSI C requires that to mean something
else (which is useless).
Likewise, to declare that a function is side-effect-free
so that calls may be deleted or combined, write
something like this (works only in 2.5):
int computation () __attribute__ ((const));
or like this (works in older versions too):
typedef int intfn ();
const intfn computation;
* The new option -iwithprefixbefore specifies a directory to add to
the search path for include files in the same position where -I would
put it, but uses the specified prefix just like -iwithprefix.
* Basic block profiling has been enhanced to record the function the
basic block comes from, and if the module was compiled for debugging,
the line number and filename. A default version of the basic block
support module has been added to libgcc2 that appends the basic block
information to a text file 'bb.out'. Machine descriptions can now
override the basic block support module in the target macro file.
New features in g++:
* The new flag `-fansi-overloading' for C++. Use a newly implemented
scheme of argument matching for C++. It makes g++ more accurately
obey the rules set down in Chapter 13 of the Annotated C++ Reference
Manual (the ARM). This option will be turned on by default in a
future release.
* The -finline-debug flag is now gone (it was never really used by the
compiler).
* Recognizing the syntax for pointers to members, e.g., "foo::*bar", has been
dramatically improved. You should not get any syntax errors or incorrect
runtime results while using pointers to members correctly; if you do, it's
a definite bug.
* Forward declaration of an enum is now flagged as an error.
* Class-local typedefs are now working properly.
* Nested class support has been significantly improved. The compiler
will now (in theory) support up to 240 nested classes before hitting
other system limits (like memory size).
* There is a new C version of the `g++' driver, to replace the old
shell script. This should significantly improve the performance of
executing g++ on a system where a user's PATH environment variable
references many NFS-mounted filesystems. This driver also works
under MS-DOS and OS/2.
* The ANSI committee working on the C++ standard has adopted a new
keyword `mutable'. This will allow you to make a specific member be
modifiable in an otherwise const class.
Noteworthy GCC changes in version 2.4.4:
A crash building g++ on various hosts (including m68k) has been
fixed. Also the g++ compiler no longer reports incorrect
ambiguities in some situations where they do not exist, and
const template member functions are now being found properly.
Noteworthy GCC changes in version 2.4:
* On each target, the default is now to return short structures
compatibly with the "usual" compiler on that target.
For most targets, this means the default is to return all structures
in memory, like long structures, in whatever way is used on that
target. Use -freg-struct-return to enable returning short structures
(and unions) in registers.
This change means that newly compiled binaries are incompatible with
binaries compiled with previous versions of GCC.
On some targets, GCC is itself the usual compiler. On these targets,
the default way to return short structures is still in registers.
Use -fpcc-struct-return to tell GCC to return them in memory.
* There is now a floating point emulator which can imitate the way all
supported target machines do floating point arithmetic.
This makes it possible to have cross compilation to and from the VAX,
and between machines of different endianness. However, this works
only when the target machine description is updated to use the new
facilities, and not all have been updated.
This also makes possible support for longer floating point types.
GCC 2.4 supports extended format on the 68K if you use `long double',
for targets that have a 68881. (When we have run time library
routines for extended floating point, then `long double' will use
extended format on all 68K targets.)
We expect to support extended floating point on the i386 and Sparc in
future versions.
* Building GCC now automatically fixes the system's header files.
This should require no attention.
* GCC now installs an unsigned data type as size_t when it fixes the
header files (on all but a handful of old target machines).
Therefore, the bug that size_t failed to be unsigned is fixed.
* Building and installation are now completely separate.
All new files are constructed during the build process;
installation just copies them.
* New targets supported: Clipper, Hitachi SH, Hitachi 8300, and Sparc
Lite.
* A totally new and much better Objective C run time system is included.
* Objective C supports many new features. Alas, I can't describe them
since I don't use that language; however, they are the same ones
supported in recent versions of the NeXT operating system.
* The builtin functions __builtin_apply_args, __builtin_apply and
__builtin_return let you record the arguments and returned
value of a function without knowing their number or type.
* The builtin string variables __FUNCTION__ and __PRETTY_FUNCTION__
give the name of the function in the source, and a pretty-printed
version of the name. The two are the same in C, but differ in C++.
* Casts to union types do not yield lvalues.
* ## before an empty rest argument discards the preceding sequence
of non-whitespace characters from the macro definition.
(This feature is subject to change.)
New features specific to C++:
* The manual contains a new section ``Common Misunderstandings with
GNU C++'' that C++ users should read.
* #pragma interface and #pragma implementation let you use the same
C++ source file for both interface and implementation.
However, this mechanism is still in transition.
* Named returned values let you avoid an extra constructor call
when a function result has a class type.
* The C++ operators <? and >? yield min and max, respectively.
* C++ gotos can exit a block safely even if the block has
aggregates that require destructors.
* gcc defines the macro __GNUG__ when compiling C++ programs.
* GNU C++ now correctly distinguishes between the prefix and postfix
forms of overloaded operator ++ and --. To avoid breaking old
code, if a class defines only the prefix form, the compiler
accepts either ++obj or obj++, unless -pedantic is used.
* If you are using version 2.3 of libg++, you need to rebuild it with
`make CC=gcc' to avoid mismatches in the definition of `size_t'.
Newly documented compiler options:
-fnostartfiles
Omit the standard system startup files when linking.
-fvolatile-global
Consider memory references to extern and global data items to
be volatile.
-idirafter DIR
Add DIR to the second include path.
-iprefix PREFIX
Specify PREFIX for later -iwithprefix options.
-iwithprefix DIR
Add PREFIX/DIR to the second include path.
-mv8
Emit Sparc v8 code (with integer multiply and divide).
-msparclite
Emit Sparclite code (roughly v7.5).
-print-libgcc-file-name
Search for the libgcc.a file, print its absolute file name, and exit.
-Woverloaded-virtual
Warn when a derived class function declaration may be an error
in defining a C++ virtual function.
-Wtemplate-debugging
When using templates in a C++ program, warn if debugging is
not yet fully available.
+eN
Control how C++ virtual function definitions are used
(like cfront 1.x).

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3. When find_reloads is used to count number of spills needed
it does not take into account the fact that a reload may
turn out to be a dummy.
I'm not sure this really happens any more. Doesn't it find
all the dummies on both passes?
10. movl a3@,a0
movl a3@(16),a1
clrb a0@(a1:l)
is generated and may be worse than
movl a3@,a0