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Changes in 2.21:

* Gas no longer requires doubling of ampersands in macros.

* Add support for the TMS320C6000 (TI C6X) processor family.

* GAS now understands an extended syntax in the .section directive flags

  for COFF targets that allows the section's alignment to be specified.  This

  feature has also been backported to the 2.20 release series, starting with

  2.20.1.

* Add support for the Renesas RX processor.

* New command line option, --compress-debug-sections, which requests

  compression of DWARF debug information sections in the relocatable output

  file.  Compressed debug sections are supported by readelf, objdump, and

  gold, but not currently by Gnu ld.

Changes in 2.20:

* Added support for v850e2 and v850e2v3.

* GNU/Linux targets now supports "gnu_unique_object" as a value in the .type

  pseudo op.  It marks the symbol as being globally unique in the entire

  process.

* ARM assembler now supports .inst[.nw] pseudo-ops to insert opcodes specified

  in binary rather than text.

* Add support for common symbol alignment to PE formats.

* Add support for the new discriminator column in the DWARF line table,

  with a discriminator operand for the .loc directive.

* Add support for Sunplus score architecture.

* The .type pseudo-op now accepts a type of STT_GNU_IFUNC which can be used to

  indicate that if the symbol is the target of a relocation, its value should

  not be use.  Instead the function should be invoked and its result used as

  the value.

* Add support for Lattice Mico32 (lm32) architecture.

* Add support for Xilinx MicroBlaze architecture.

Changes in 2.19:

* New pseudo op .cfi_val_encoded_addr, to record constant addresses in unwind

  tables without runtime relocation.

* New command line option, -h-tick-hex, for sh, m32c, and h8/300 targets, which

  adds compatibility with H'00 style hex constants.

* New command line option, -msse-check=[none|error|warning], for x86

  targets.

* New sub-option added to the assembler's -a command line switch to

  generate a listing output.  The 'g' sub-option will insert into the listing

  various information about the assembly, such as assembler version, the

  command line options used, and a time stamp.

* New command line option -msse2avx for x86 target to encode SSE

  instructions with VEX prefix.

* Add Intel XSAVE, EPT, MOVBE, AES, PCLMUL, AVX/FMA support for x86 target.

* New command line options, -march=CPU[,+EXTENSION...], -mtune=CPU,

  -mmnemonic=[att|intel], -msyntax=[att|intel], -mindex-reg,

  -mnaked-reg and -mold-gcc, for x86 targets.

* Support for generating wide character strings has been added via the new

  pseudo ops: .string16, .string32 and .string64.

* Support for SSE5 has been added to the i386 port.

Changes in 2.18:

* The GAS sources are now released under the GPLv3.

* Support for the National Semiconductor CR16 target has been added.

* Added gas .reloc pseudo.  This is a low-level interface for creating

  relocations.

* Add support for x86_64 PE+ target.

* Add support for Score target.

Changes in 2.17:

* Support for the Infineon XC16X has been added by KPIT Cummins Infosystems.

* Support for ms2 architecture has been added.

* Support for the Z80 processor family has been added.

* Add support for the "@" syntax to the command line, so that extra

  switches can be read from .

* The SH target supports a new command line switch --enable-reg-prefix which,

  if enabled, will allow register names to be optionally prefixed with a $

  character.  This allows register names to be distinguished from label names.

* Macros with a variable number of arguments are now supported. See the

  documentation for how this works.

* Added --reduce-memory-overheads switch to reduce the size of the hash

  tables used, at the expense of longer assembly times, and

  --hash-size= to set the size of the hash tables used by gas.

* Macro names and macro parameter names can now be any identifier that would

  also be legal as a symbol elsewhere. For macro parameter names, this is

  known to cause problems in certain sources when the respective target uses

  characters inconsistently, and thus macro parameter references may no longer

  be recognized as such (see the documentation for details).

* Support the .f_floating, .d_floating, .g_floating and .h_floating directives

  for the VAX target in order to be more compatible with the VAX MACRO

  assembler.

* New command line option -mtune=[itanium1|itanium2] for IA64 targets.

Changes in 2.16:

* Redefinition of macros now results in an error.

* New command line option -mhint.b=[ok|warning|error] for IA64 targets.

* New command line option -munwind-check=[warning|error] for IA64

  targets.

* The IA64 port now uses automatic dependency violation removal as its default

  mode.

* Port to MAXQ processor contributed by HCL Tech.

* Added support for generating unwind tables for ARM ELF targets.

* Add a -g command line option to generate debug information in the target's

  preferred debug format.

* Support for the crx-elf target added.

* Support for the sh-symbianelf target added.

* Added a pseudo-op (.secrel32) to generate 32 bit section relative relocations

  on pe[i]-i386; required for this target's DWARF 2 support.

* Support for Motorola MCF521x/5249/547x/548x added.

* Support for ColdFire EMAC instructions added and Motorola syntax for MAC/EMAC

  instrucitons.

* New command line option -mno-shared for MIPS ELF targets.

* New command line option --alternate and pseudo-ops .altmacro and .noaltmacro

  added to enter (and leave) alternate macro syntax mode.

Changes in 2.15:

* The MIPS -membedded-pic option (Embedded-PIC code generation) is

  deprecated and will be removed in a future release.

* Added PIC m32r Linux (ELF) and support to M32R assembler.

* Added support for ARM V6.

* Added support for sh4a and variants.

* Support for Renesas M32R2 added.

* Limited support for Mapping Symbols as specified in the ARM ELF

  specification has been added to the arm assembler.

* On ARM architectures, added a new gas directive ".unreq" that undoes

  definitions created by ".req".

* Support for Motorola ColdFire MCF528x added.

* Added --gstabs+ switch to enable the generation of STABS debug format

  information with GNU extensions.

* Added support for MIPS64 Release 2.

* Added support for v850e1.

* Added -n switch for x86 assembler.  By default, x86 GAS replaces

  multiple nop instructions used for alignment within code sections

  with multi-byte nop instructions such as leal 0(%esi,1),%esi.  This

  switch disables the optimization.

* Removed -n option from MIPS assembler.  It was not useful, and confused the

  existing -non_shared option.

Changes in 2.14:

* Added support for MIPS32 Release 2.

* Added support for Xtensa architecture.

* Support for Intel's iWMMXt processor (an ARM variant) added.

* An assembler test generator has been contributed and an example file that

  uses it (gas/testsuite/gas/all/test-gen.c and test-exmaple.c).

* Support for SH2E added.

* GASP has now been removed.

* Support for Texas Instruments TMS320C4x and TMS320C3x series of

  DSP's contributed by Michael Hayes and Svein E. Seldal.

* Support for the Ubicom IP2xxx microcontroller added.

Changes in 2.13:

* Support for the Fujitsu FRV architecture added by Red Hat. Models for FR400

  and FR500 included.

* Support for DLX processor added.

* GASP has now been deprecated and will be removed in a future release.  Use

  the macro facilities in GAS instead.

* GASP now correctly parses floating point numbers. Unless the base is

  explicitly specified, they are interpreted as decimal numbers regardless of

  the currently specified base.

Changes in 2.12:

* Support for Don Knuth's MMIX, by Hans-Peter Nilsson.

* Support for the OpenRISC 32-bit embedded processor by OpenCores.

* The ARM assembler now accepts -march=..., -mcpu=... and -mfpu=... for

  specifying the target instruction set.  The old method of specifying the

  target processor has been deprecated, but is still accepted for

  compatibility.

* Support for the VFP floating-point instruction set has been added to

  the ARM assembler.

* New psuedo op: .incbin to include a set of binary data at a given point

  in the assembly.  Contributed by Anders Norlander.

* The MIPS assembler now accepts -march/-mtune. -mcpu has been deprecated

  but still works for compatability.

* The MIPS assembler no longer issues a warning by default when it

  generates a nop instruction from a macro. The new command line option

  -n will turn on the warning.

Changes in 2.11:

* Support for PDP-11 and 2.11BSD a.out format, by Lars Brinkhoff.

* x86 gas now supports the full Pentium4 instruction set.

* Support for AMD x86-64 architecture, by Jan Hubicka, SuSE Labs.

* Support for Motorola 68HC11 and 68HC12.

* Support for Texas Instruments TMS320C54x (tic54x).

* Support for IA-64.

* Support for i860, by Jason Eckhardt.

* Support for CRIS (Axis Communications ETRAX series).

* x86 gas has a new .arch pseudo op to specify the target CPU architecture.

* x86 gas -q command line option quietens warnings about register size changes

  due to suffix, indirect jmp/call without `*', stand-alone prefixes, and

  translating various deprecated floating point instructions.

Changes in 2.10:

* Support for the ARM msr instruction was changed to only allow an immediate

  operand when altering the flags field.

* Support for ATMEL AVR.

* Support for IBM 370 ELF.  Somewhat experimental.

* Support for numbers with suffixes.

* Added support for breaking to the end of repeat loops.

* Added support for parallel instruction syntax (DOUBLEBAR_PARALLEL).

* New .elseif pseudo-op added.

* New --fatal-warnings option.

* picoJava architecture support added.

* Motorola MCore 210 processor support added.

* A new pseudo-op .intel_syntax has been implemented to allow gas to parse i386

  assembly programs with intel syntax.

* New pseudo-ops .func,.endfunc to aid in debugging user-written assembler code.

* Added -gdwarf2 option to generate DWARF 2 debugging information.

* Full 16-bit mode support for i386.

* Greatly improved instruction operand checking for i386.  This change will

  produce errors or warnings on incorrect assembly code that previous versions

  of gas accepted.  If you get unexpected messages from code that worked with

  older versions of gas, please double check the code before reporting a bug.

* Weak symbol support added for COFF targets.

* Mitsubishi D30V support added.

* Texas Instruments c80 (tms320c80) support added.

* i960 ELF support added.

* ARM ELF support added.

Changes in 2.9:

* Texas Instruments c30 (tms320c30) support added.

* The assembler now optimizes the exception frame information generated by egcs

  and gcc 2.8.  The new --traditional-format option disables this optimization.

* Added --gstabs option to generate stabs debugging information.

* The -a option takes a new suboption, m (e.g., -alm) to expand macros in a

  listing.

* Added -MD option to print dependencies.

Changes in 2.8:

* BeOS support added.

* MIPS16 support added.

* Motorola ColdFire 5200 support added (configure for m68k and use -m5200).

* Alpha/VMS support added.

* m68k options --base-size-default-16, --base-size-default-32,

  --disp-size-default-16, and --disp-size-default-32 added.

* The alignment directives now take an optional third argument, which is the

  maximum number of bytes to skip.  If doing the alignment would require

  skipping more than the given number of bytes, the alignment is not done at

  all.

* The ELF assembler has a new pseudo-op, .symver, used for symbol versioning.

* The -a option takes a new suboption, c (e.g., -alc), to skip false

  conditionals in listings.

* Added new pseudo-op, .equiv; it's like .equ, except that it is an error if

  the symbol is already defined.

Changes in 2.7:

* The PowerPC assembler now allows the use of symbolic register names (r0,

  etc.) if -mregnames is used.  Symbolic names preceded by a '%' (%r0, etc.)

  can be used any time.  PowerPC 860 move to/from SPR instructions have been

  added.

* Alpha Linux (ELF) support added.

* PowerPC ELF support added.

* m68k Linux (ELF) support added.

* i960 Hx/Jx support added.

* i386/PowerPC gnu-win32 support added.

* SCO ELF support added.  For OpenServer 5 targets (i386-unknown-sco3.2v5) the

  default is to build COFF-only support.  To get a set of tools that generate

  ELF (they'll understand both COFF and ELF), you must configure with

  target=i386-unknown-sco3.2v5elf.

* m88k-motorola-sysv3* support added.

Changes in 2.6:

* Gas now directly supports macros, without requiring GASP.

* Gas now has an MRI assembler compatibility mode.  Use -M or --mri to select

  MRI mode.  The pseudo-op ``.mri 1'' will switch into the MRI mode until the

  ``.mri 0'' is seen; this can be convenient for inline assembler code.

* Added --defsym SYM=VALUE option.

* Added -mips4 support to MIPS assembler.

* Added PIC support to Solaris and SPARC SunOS 4 assembler.

Changes in 2.4:

* Converted this directory to use an autoconf-generated configure script.

* ARM support, from Richard Earnshaw.

* Updated VMS support, from Pat Rankin, including considerably improved

  debugging support.

* Support for the control registers in the 68060.

* Handles (ignores) a new directive ".this_GCC_requires_the_GNU_assembler", to

  provide for possible future gcc changes, for targets where gas provides some

  features not available in the native assembler.  If the native assembler is

  used, it should become obvious pretty quickly what the problem is.

* Usage message is available with "--help".

* The GNU Assembler Preprocessor (gasp) is included.  (Actually, it was in 2.3

  also, but didn't get into the NEWS file.)

* Weak symbol support for a.out.

* A bug in the listing code which could cause an infinite loop has been fixed.

  Bugs in listings when generating a COFF object file have also been fixed.

* Initial i386-svr4 PIC implementation from Eric Youngdale, based on code by

  Paul Kranenburg.

* Improved Alpha support.  Immediate constants can have a much larger range

  now. Support for the 21164 has been contributed by Digital.

* Updated ns32k (pc532-mach, netbsd532) support from Ian Dall.

Changes in 2.3:

* Mach i386 support, by David Mackenzie and Ken Raeburn.

* RS/6000 and PowerPC support by Ian Taylor.

* VMS command scripts (make-gas.com, config-gas.com) have been worked on a bit,

  based on mail received from various people.  The `-h#' option should work

  again too.

* HP-PA work, by Jeff Law.  Note, for the PA, gas-2.3 has been designed to work

  with gdb-4.12 and gcc-2.6.  As gcc-2.6 has not been released yet, a special

  version of gcc-2.5.8 has been patched to work with gas-2.3.  You can retrieve

  this special version of gcc-2.5.8 via anonymous ftp from jaguar.cs.utah.edu

  in the "dist" directory.

* Vax support in gas fixed for BSD, so it builds and seems to run a couple

  simple tests okay.  I haven't put it through extensive testing.  (GNU make is

  currently required for BSD 4.3 builds.)

* Support for the DEC Alpha, running OSF/1 (ECOFF format).  The gas support is

  based on code donated by CMU, which used an a.out-based format.  I'm afraid

  the alpha-a.out support is pretty badly mangled, and much of it removed;

  making it work will require rewriting it as BFD support for the format anyways.

* Irix 5 support.

* The test suites have been fixed up a bit, so that they should work with a

  couple different versions of expect and dejagnu.

* Symbols' values are now handled internally as expressions, permitting more

  flexibility in evaluating them in some cases.  Some details of relocation

  handling have also changed, and simple constant pool management has been

  added, to make the Alpha port easier.

* New option "--statistics" for printing out program run times.  This is

  intended to be used with the gcc "-Q" option, which prints out times spent in

  various phases of compilation.  (You should be able to get all of them

  printed out with "gcc -Q -Wa,--statistics", I think.)

Changes in 2.2:

* RS/6000 AIX and MIPS SGI Irix 5 support has been added.

* Configurations that are still in development (and therefore are convenient to

  have listed in configure.in) still get rejected without a minor change to

  gas/Makefile.in, so people not doing development work shouldn't get the

  impression that support for such configurations is actually believed to be

  reliable.

* The program name (usually "as") is printed when a fatal error message is

  displayed.  This should prevent some confusion about the source of occasional

  messages about "internal errors".

* ELF support is falling into place.  Support for the 386 should be working.

  Support for SPARC Solaris is in.  HPPA support from Utah is being integrated.

* Symbol values are maintained as expressions instead of being immediately

  boiled down to add-symbol, sub-symbol, and constant.  This permits slightly

  more complex calculations involving symbols whose values are not alreadey

  known.

* DBX-style debugging info ("stabs") is now supported for COFF formats.

  If any stabs directives are seen in the source, GAS will create two new

  sections: a ".stab" and a ".stabstr" section.  The format of the .stab

  section is nearly identical to the a.out symbol format, and .stabstr is

  its string table.  For this to be useful, you must have configured GCC

  to generate stabs (by defining DBX_DEBUGGING_INFO), and must have a GDB

  that can use the stab sections (4.11 or later).

* LynxOS, on i386 and m68k platforms, is now supported.  SPARC LynxOS

  support is in progress.

Changes in 2.1:

* Several small fixes for i386-aix (PS/2) support from Minh Tran-Le have been

  incorporated, but not well tested yet.

* Altered the opcode table split for m68k; it should require less VM to compile

  with gcc now.

* Some minor adjustments to add (Convergent Technologies') Miniframe support,

  suggested by Ronald Cole.

* HPPA support (running OSF only, not HPUX) has been contributed by Utah.  This

  includes improved ELF support, which I've started adapting for SPARC Solaris

  2.x.  Integration isn't completely, so it probably won't work.

* HP9000/300 support, donated by HP, has been merged in.

* Ian Taylor has finished the MIPS ECOFF (Ultrix, Irix) support.

* Better error messages for unsupported configurations (e.g., hppa-hpux).

* Test suite framework is starting to become reasonable.

Changes in 2.0:

* Mostly bug fixes.

* Some more merging of BFD and ELF code, but ELF still doesn't work.

Changes in 1.94:

* BFD merge is partly done.  Adventurous souls may try giving configure the

  "--with-bfd-assembler" option.  Currently, ELF format requires it, a.out

  format accepts it; SPARC CPU accepts it.  It's the default only for OS "elf"

  or "solaris".  (ELF isn't really supported yet.  It needs work.  I've got

  some code from Utah for HP-PA ELF, and from DG for m88k ELF, but they're not

  fully merged yet.)

* The 68K opcode table has been split in half.  It should now compile under gcc

  without consuming ridiculous amounts of memory.

* A couple data structures have been reduced in size.  This should result in

  saving a little bit of space at runtime.

* Support for MIPS, from OSF and Ralph Campbell, has been merged in.  The OSF

  code provided ROSE format support, which I haven't merged in yet.  (I can

  make it available, if anyone wants to try it out.)  Ralph's code, for BSD

  4.4, supports a.out format.  We don't have ECOFF support in just yet; it's

  coming.

* Support for the Hitachi H8/500 has been added.

* VMS host and target support should be working now, thanks chiefly to Eric

  Youngdale.

Changes in 1.93.01:

* For m68k, support for more processors has been added: 68040, CPU32, 68851.

* For i386, .align is now power-of-two; was number-of-bytes.

* For m68k, "%" is now accepted before register names.  For COFF format, which

  doesn't use underscore prefixes for C labels, it is required, so variable "a0"

  can be distinguished from the register.

* Last public release was 1.38.  Lots of configuration changes since then, lots

  of new CPUs and formats, lots of bugs fixed.

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