ld/NEWS

   1 -*- text -*-
   2
   3 * Add a configure option --enable-relro to decide whether -z relro should
   4   be enabled in ELF linker by default.  Default to yes for all Linux
   5   targets except FRV, HPPA, IA64 and MIPS.
   6
   7 * Support for -z noreloc-overflow in the x86-64 ELF linker to disable
   8   relocation overflow check.
   9
  10 * Add -z common/-z nocommon options for ELF targets to control whether to
  11   convert common symbols to the STT_COMMON type during a relocatable link.
  12
  13 * Support for -z nodynamic-undefined-weak in the x86 ELF linker, which
  14   avoids dynamic relocations against undefined weak symbols in executable.
  15
  16 * The NOCROSSREFSTO command was added to the linker script language.
  17
  18 * Add --no-apply-dynamic-relocs to the AArch64 linker to do not apply link-time
  19   values for dynamic relocations.
  20
  21 Changes in 2.26:
  22
  23 * Add --fix-stm32l4xx-629360 to the ARM linker to enable a link-time
  24   workaround for a bug in the bus matrix / memory controller for some of
  25   the STM32 Cortex-M4 based products (STM32L4xx)
  26
  27 * Add a configure option --enable-compressed-debug-sections={all,ld} to
  28   decide whether DWARF debug sections should be compressed by default.
  29
  30 * Add support for the ARC EM/HS, and ARC600/700 architectures.
  31
  32 * Experimental support for linker garbage collection (--gc-sections)
  33   has been enabled for COFF and PE based targets.
  34
  35 * New command line option for ELF targets to compress DWARF debug
  36   sections, --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi].
  37
  38 * New command line option, --orphan-handling=[place|warn|error|discard], to
  39   adjust how orphan sections are handled.  The default is 'place' which gives
  40   the current behaviour, 'warn' and 'error' issue a warning or error
  41   respectively when orphan sections are found, and 'discard' will discard all
  42   orphan sections.
  43
  44 * Add support for LLVM plugin.
  45
  46 * Add --print-memory-usage option to report memory blocks usage.
  47
  48 * Add --require-defined option, it's like --undefined except the new symbol
  49   must be defined by the end of the link.
  50
  51 Changes in 2.25:
  52
  53 * PE binaries now once again contain real timestamps by default.  To disable
  54   the inclusion of a timestamp in a PE binary, use the --no-insert-timestamp
  55   command line option.
  56
  57 * Replace support for openrisc and or32 with support for or1k.
  58
  59 * Add support for the --build-id command line option to COFF based targets.
  60
  61 * x86/x86_64 pe-coff now supports the --build-id option.
  62
  63 * Add support for the Andes NDS32.
  64
  65 Changes in 2.24:
  66
  67 * Add LOG2CEIL() builtin function to the linker script language
  68
  69 * Add support for the Texas Instruments MSP430X processor.
  70
  71 * Add support for Altera Nios II.
  72
  73 * Add support for the V850E3V5 architecture.
  74
  75 * Add support for the Imagination Technologies Meta processor.
  76
  77 * --enable-new-dtags no longer generates old dtags in addition to new dtags.
  78
  79 * Remove linker support for MIPS ECOFF targets.
  80
  81 * Add ALIGN_WITH_INPUT to the linker script language to force the alignment of
  82   an output section to use the maximum alignment of all its input sections.
  83
  84 Changes in 2.23:
  85
  86 * Enable compressed debug section feature for x86/x86_64 pe-coff.
  87
  88 * Add support for the 64-bit ARM architecture: AArch64.
  89
  90 * Added SORT_NONE to the linker script language to disable section sorting.
  91
  92 * Add a linker-provided symbol when producing ELF output, '__ehdr_start'
  93   to point to the ELF file header (and nearby program headers) in the
  94   program's memory image.
  95
  96 * Add support for S12X processor.
  97
  98 * Add support for the VLE extension to the PowerPC architecture.
  99
 100 * Add support for the Freescale XGATE architecture.
 101
 102 * Add option -f FILE on AIX (for response file).
 103
 104 * Add support for the Renesas RL78 architecture.
 105
 106 * Add support for the Adapteva EPIPHANY architecture.
 107
 108 Changes in 2.22:
 109
 110 * --copy-dt-needed-entries is no longer enabled by default.  Instead
 111   --no-copy-dt-needed-entries is the default.
 112
 113 * INPUT_SECTION_FLAGS has been added to the linker script language
 114   to allow selection of input sections by section header section flags.
 115
 116 * Add support for the Tilera TILEPro and TILE-Gx architectures.
 117
 118 * Added SORT_BY_INIT_PRIORITY to the linker script language to permit
 119   sorting sections by numerical value of the GCC init_priority attribute
 120   encoded in the section name.
 121
 122 Changes in 2.21:
 123
 124 * Linker script expression evaluation is somewhat more sane.  This may
 125   break scripts that depend on quirks of the old expression evaluation.
 126
 127 * Turn off underscoring for x86_64 PE+-COFF targets.  For old behavior the
 128   option --enable-leading-mingw64-underscores can be used on configure of
 129   bfd.
 130
 131 * Add support for the TMS320C6000 (TI C6X) processor family.
 132
 133 * --add-needed renamed to --copy-dt-needed-entries in order to avoid confusion
 134   with --as-needed option.
 135
 136 * Extend .def file syntax by '== <ID>' for imports and exports. This allows
 137   to alias the import/export table name written in PE image.
 138
 139 * Add --exclude-all-symbols option to PE based linkers.  This prevents all
 140   symbols from automatically being exported.
 141
 142 * Add support for the Renesas RX processor.
 143
 144 * Add support for alpha-vms target.
 145
 146 Changes in 2.20:
 147
 148 * GNU/Linux targets now support the STB_GNU_UNIQUE symbol binding.  This is a
 149   GNU extension to the standard set of ELF symbol bindings.  The binding will
 150   be passed on to the dynamic linker which will make sure that in the entire
 151   process there is just one symbol with the given name and type in use.
 152
 153 * PE targets now support a GNU extension to allow the alignment of common
 154   common symbols to be specified.  This support uses custom options in
 155   the .drectve section, which will be disregarded by the native tools.
 156
 157 * PE targets now add primitive support for ELF version scripts; symbols
 158   are not versioned, but the local and global symbol visibility directives
 159   are respected when filtering symbols in auto-export mode.
 160
 161 * New option --no-export-dynamic to undo the effect of the -E and
 162   --export-dynamic options.
 163
 164 * ELF: --warn-alternate-em option to warn if an object has alternate
 165   ELF machine code.
 166
 167 * New script function REGION_ALIAS to add alias names to memory regions.
 168
 169 * PE targets no longer make use of the long section names PE extension to
 170   the COFF format when generating executable images, by default.  The old
 171   (slightly non-conformant) behaviour can still be invoked by using the
 172   new '--enable-long-section-names' command-line option.  It is also enabled
 173   automatically in the presence of un-stripped debug information, as GDB
 174   needs to be able to find the debug info sections by their full names.
 175
 176 * For GNU/Linux systems the linker will now avoid processing any relocations
 177   made against symbols of the STT_GNU_IFUNC type and instead emit them into
 178   the resulting binary for processing by the loader.
 179
 180 * --as-needed now links in a dynamic library if it satisfies undefined
 181   symbols in regular objects, or in other dynamic libraries.  In the
 182   latter case the library is not linked if it is found in a DT_NEEDED
 183   entry of one of the libraries already linked.
 184
 185 * Add a new command line option, -Ttext-segment ADDR, for ELF targets
 186   to set the address of the first byte of the text segment.
 187
 188 * Add support for Sunplus score architecture.
 189
 190 * Add new option --use-nul-prefixed-import-tables to ld for PE targets to
 191   allow fallback to old import table generation with null element prefix.
 192
 193 * Windows PE systems now support a new --exclude-modules-for-implib option,
 194   allowing users to partition object files and archive members between a DLL
 195   and its associated import library as they are generated during linking.
 196
 197 * Add support for Lattice Mico32 (lm32) architecture.
 198
 199 * Add CR16 ELF --embedded-relocs (used to embedded relocations into binaries
 200   for Embedded-PIC code) option.
 201
 202 * Add to the PE/PE+ targets the support of two different kinds of
 203   pseudo-relocations.  They can be selected by the switches
 204   --enable-runtime-pseudo-reloc-v1 and --enable-runtime-pseudo-reloc-v2.
 205   For the switch --enable-runtime-pseudo-reloc it uses for 32-bit
 206   runtime pseudo relocation version one, for 64-bit the version two.
 207
 208 Changes in 2.19:
 209
 210 * Linker scripts support a new INSERT command that makes it easier to
 211   augment the default script.
 212
 213 * Linker script input section filespecs may now specify a file within an
 214   archive by writing "archive:file".
 215
 216 * The --sort-common switch now has an optional argument which specifies the
 217   direction of sorting.
 218
 219 * The M68K linker now supports multiple GOT generation schemes controlled via
 220   the --got=<type> command line option.
 221
 222 * The ARM EABI linker will now generate stubs for function calls to symbols
 223   that are too far away.  The placement of the stubs is controlled by a new
 224   linker command line option: --stub-group-size=N.
 225
 226 Changes in 2.18:
 227
 228 * Linker sources now released under version 3 of the GNU General Public
 229   License.
 230
 231 * ELF: New --build-id option to generate a unique per-binary identifier
 232   embedded in a note section.
 233
 234 * Added support for National Semicondutor CompactRISC (ie CR16) target.
 235
 236 * -l:foo now searches the library path for a filename called foo,
 237   without converting it to libfoo.a or libfoo.so.
 238
 239 * Add a new command line option '--default-script=FILE' or '-dT FILE'
 240   which specifies a replacement for the built in, default linker
 241   script.
 242
 243 * ELF: Add -Bsymbolic-functions, --dynamic-list-cpp-new, which puts C++
 244   operator new and delete on the dynamic list, and --dynamic-list-data,
 245   builtin list for --dynamic-list, which puts global data symbols on the
 246   dynamic list.
 247
 248 * Add support for x86_64 PE+ target.
 249
 250 * Add support for Score target.
 251
 252 * ELF: Add --dynamic-list option to specify a list of global symbols
 253   whose references shouldn't be bound to the definition within the
 254   shared library, or a list of symbols which should be added to the
 255   symbol table in the executable.
 256
 257 * The default output section LMA has changed for allocatable sections from
 258   being equal to VMA, to keeping the difference between LMA and VMA the same as
 259   the previous output section in the same region.  This is a more useful
 260   default when using overlays and other cases where you specify an LMA
 261   differing from the VMA for some sections.
 262
 263 * New switch: --print-gc-sections to list any sections removed by garabge
 264   collection.
 265
 266 * ARM: Added --vfp11-denorm-fix option to work around an erratum in current
 267   VFP11 coprocessors.
 268
 269 Changes in 2.17:
 270
 271 * Support for the Infineon XC16X has been added by KPIT Cummins Infosystems.
 272
 273 * Modify the Linux linker search order to better match ld.so search order.
 274   Look for DT_NEEDED libraries in paths specified by ld.so.conf before
 275   searching the default directories, rather than vice versa.
 276   Use $prefix/etc/ld.so.conf if it exists, otherwise /etc/ld.so.conf.
 277
 278 * PE-COFF: Forward exports from DLL's can now be specified in .def files
 279   passed directly to ld.
 280
 281 * Support for the Z80 processor family has been added.
 282
 283 * Add support for the "@<file>" syntax to the command line, so that extra
 284   switches can be read from <file>.
 285
 286 Changes in 2.16:
 287
 288 * Support for the R_ARM_V4BX relocation as defined in the ARM AAELF
 289   specification has been added via the --fix-v4bx command-line option.
 290
 291 * New linker script construct AS_NEEDED(), which sets the --as-needed flag
 292   for input files listed inside of it.
 293
 294 * A new command-line option, --sysroot, can be used to override the
 295   default sysroot location.  It only applies to toolchains that were
 296   configured using --with-sysroot.
 297
 298 * New linker script functions: ORIGIN() and LENGTH() which return information
 299   about a specified memory region.
 300
 301 * Port to MAXQ processor contributed by HCL Tech.
 302
 303 * Added SEGMENT_START to the linker script language to permit the user to
 304   override the base address for a segment from the command-line.
 305
 306 * ELF: --warn-shared-textrel option to warn if adding a DT_TEXTREL to a shared
 307   object.
 308
 309 * Added SORT_BY_NAME and SORT_BY_ALIGNMENT to the linker script
 310   language to permit sorting sections by section name or section
 311   maximum alignment.
 312
 313 * Added a new linker command line switch, --sort-section name|alignment,
 314   to sort sections by section name or maximum alignment.
 315
 316 * ELF: --add-needed/--no-add-needed options to control if a DT_NEEDED tag
 317   should be added when a shared library comes from DT_NEEDED tags.
 318
 319 * Support for the crx-elf target added.
 320
 321 * Support for the sh-symbianelf target added.
 322
 323 * A new linker command line switch has been added which allows the hash table
 324   size to be set to a suitable prime value near to its argument.  This switch
 325   is --hash-size=<NUMBER>.  Also if the switch --reduce-memory-overheads is
 326   used, and --hash-size has not been used, then the default value will be set
 327   to 1021.
 328
 329 * Linker map files are now generated with an O(N) algorithm for finding symbols
 330   that are defined in each section.  This uses about 40% more memory for
 331   symbols than the old O(N^2) algorithm.  You can use the new
 332   --reduce-memory-overheads option to select the old algorithm; this option
 333   might also be used in the future to select similar tradeoffs.
 334
 335 Changes in 2.15:
 336
 337 * ELF: --as-needed/--no-as-needed options to control if a DT_NEEDED tag should
 338   be added only when a shared library is referenced.
 339
 340 * PE: --large-address-aware option to indicate executables support virtual
 341   addresses greater than 2 gigabytes.
 342
 343 * DWARF 2 support for i386pe added.
 344
 345 * The linker script operator DEFINED() will now yield 1 only for a symbol that
 346   is defined before the statement where DEFINED is used.
 347
 348 * The MIPS --embedded-relocs (used to embed relocations into binaries for
 349   Embedded-PIC code) is deprecated and will be removed in a future release.
 350
 351 * cr16c support added by NSC.
 352
 353 * m32r Linux (ELF) support added by Renesas.
 354
 355 * Improved linker's handling of unresolved symbols.  The switch
 356   --unresolved-symbols=<method> has been added to tell the linker when it
 357   should report them and the switch --warn-unresolved-symbols has been added to
 358   make reports be issued as warning messages rather than errors.
 359
 360 Changes in 2.14:
 361
 362 * Added support for Xtensa architecture.
 363
 364 * Added --with-sysroot configure switch to specify a target system root, for
 365   linking against a target filesystem image.
 366
 367 * Added --accept-unknown-linker-format to restore old linker behaviour (pre
 368   2.14) of silently accepting and linking in any files in an unknown binary
 369   file format.
 370
 371 * Added --no-omagic to undo the effects of the -N option.
 372
 373 * Support for Texas Instruments TMS320C4x and TMS320C3x series of
 374   DSP's contributed by Michael Hayes and Svein E. Seldal.
 375
 376 * Added --with-lib-path configure switch to specify default value for
 377   LIB_PATH.
 378
 379 * ARM port to QNX operating system added by Graeme Peterson.
 380
 381 * IP2K support added by Denis Chertykov.
 382
 383 Changes in 2.13:
 384
 385 * Support for the Fujitsu FRV architecture added by Red Hat. Models for FR400
 386   and FR500 included.
 387
 388 Changes in version 2.13:
 389
 390 * DEC VAX ELF support, by Matt Thomas.
 391
 392 Changes in version 2.12:
 393
 394 * Support for Don Knuth's MMIX, by Hans-Peter Nilsson.
 395
 396 * Support for the OpenRISC 32-bit embedded processor by OpenCores.
 397
 398 * Support for -z nocopyreloc in the x86 ELF linker, which disables
 399   production of copy relocs.  Warning: using this option may result in
 400   non-sharable applications.
 401
 402 * Support for -z combreloc in the ELF linker, which puts dynamic
 403   relocations against the same symbol together, so that dynamic linker
 404   can use an one-entry symbol lookup cache.
 405
 406 * Support for ELF SHF_MERGE section merging, by Jakub Jelinek.
 407
 408 Changes in version 2.11:
 409
 410 * Support for AMD x86-64 architecture, by Jan Hubicka, SuSE Labs.
 411
 412 * Support added for eliminating duplicate DWARF2 debug information by
 413   having the compiler generate the information in sections called
 414   .gnu.linkonce.wi.XXXX where XXXX is a checksum for the contents.  The
 415   linker then merges these sections together into the normal .debug_info
 416   section.
 417
 418 * The native ELF linker now searches the directories in DT_RUNPATH or
 419   DT_RPATH of a shared library for shared libraries needed by it.
 420
 421 * TI C54x support, by Timothy Wall.
 422
 423 * Added command line switch --section-start to set the start address of any
 424   specified section.
 425
 426 * Added ability to emit full relocation information in linked executables,
 427   enabled by --emit-relocs.  Some post-linkage optimization tools need
 428   this information in order to be able to correctly identify and perform
 429   symbol relative addressing in the event of changes in section contents
 430   (instructions being added or deleted, extending data sections, etc.)
 431
 432 * Support for i860, by Jason Eckhardt (preliminary, alpha quality).
 433
 434 * Support for CRIS (Axis Communications ETRAX series).
 435
 436 * Support for PDP-11 and 2.11BSD a.out format, by Lars Brinkhoff.
 437
 438 Changes in version 2.10:
 439
 440 * Added AT> to the linker script language to allow load-time allocation of
 441   sections into regions.
 442
 443 * Added garbage collection of unused sections, enabled by --gc-sections.
 444   It does require a bit of backend support; currently implemented are
 445   arm-elf, avr-elf, d10v-elf, fr30-elf, i386-elf, m32r-elf, m68k-elf,
 446   mcore-elf, mips-elf, mn10300-elf, ppc-elf, sh-elf, sparc-elf, and v850-elf.
 447   Others will ignore the option.
 448
 449 * Added SORT to the linker script language to permit sorting sections by file
 450   name or section name.
 451
 452 * Added EXTERN to the linker script language as an equivalent to the -u
 453   command-line option.
 454
 455 * Added ASSERT to the linker script language.
 456
 457 * Added EXCLUDE_FILE to the linker script language for further control over
 458   wildcard file names.
 459
 460 * Added -O option to optimize linker output (as of this writing, this only
 461   affects ELF shared library generation).
 462
 463 * The -e option now accepts a number as well as a symbol name.
 464
 465 * Added --no-undefined option to disallow undefined symbols when creating a
 466   shared library.
 467
 468 * The linker now issues a warning, not an error, for an undefined symbol when
 469   using -Bsymbolic; use the new --no-undefined option to get the old
 470   behaviour.
 471
 472 * Added --demangle and --no-demangle options.
 473
 474 Changes in version 2.9:
 475
 476 * Added SQUAD to the linker script language.
 477
 478 * New option --no-warn-mismatch.
 479
 480 * The MEMORY command now parses the attributes to determine where sections that
 481   are not placed in a specific memory region are placed.
 482
 483 Changes in version 2.8:
 484
 485 * Linker scripts may now contain shell wildcard characters for file and section
 486   names.
 487
 488 * The linker now supports symbol versions in ELF.
 489
 490 * The NOCROSSREFS command was added to the linker script language.
 491
 492 * The LOADADDR expression was added to the linker script language.
 493
 494 * MAX and MIN functions were added to the linker script language.
 495
 496 * The OVERLAY construct was added to the linker script language.
 497
 498 * New option --warn-section-align to warn when the address of an output section
 499   changes due to alignment of an input section.
 500
 501 * New options --filter/-F and --auxiliary/-f.
 502
 503 Changes in version 2.7:
 504
 505 * New option --cref to print out a cross reference table.
 506
 507 * New option --wrap SYMBOL.
 508
 509 * New option --no-whole-archive, to turn off the effect of --whole-archive.
 510
 511 * Input sections assigned to the output section /DISCARD/ in the linker script
 512   are not included in the output file.
 513
 514 * The SunOS and ELF linkers now merge stabs debugging information which uses
 515   the N_BINCL and N_EINCL stab types.  This reduces the amount of debugging
 516   information generated.
 517
 518 Changes in version 2.6:
 519
 520 * When an ELF section name is representable as a C identifier (this is not true
 521 of most ELF section names), the linker will automatically define symbols
 522 __start_SECNAME and __stop_SECNAME, where SECNAME is the section name, at the
 523 beginning and the end of the section.  This is used by glibc.
 524
 525   Addendum: Current versions of the linker (at least for version 2.18 onwards
 526 and possibly much earlier as well) place two restrictions on this feature:  The
 527 symbols are only implemented for orphaned sections, not for explicitly placed
 528 sections and they are PROVIDEd rather than being defined.
 529
 530 * When an ELF section named .gnu.warning is encountered in an input file, the
 531 contents of the section are displayed as an error message, and the section is
 532 not copied into the output file.  This is used by glibc.
 533
 534 * When an ELF section named .gnu.warning.SYMBOL is encountered in an input
 535 file, and the symbol SYMBOL is referenced by some object file, the contents of
 536 the section are displayed as an error message.  The section is not copied into
 537 the output file, unless doing a relocatable or shared link.  This is used by
 538 glibc.
 539
 540 * New options -split-by-reloc and -split-by-file.
 541
 542 * The linker now supports linking PIC compiled code on SPARC SunOS.  It can
 543 also create SPARC SunOS shared libraries, and, like the native SunOS linker,
 544 will do so whenever there is an undefined symbol in the link and neither the -e
 545 nor the -r option was used.
 546
 547 * The -rpath option may be used on SunOS to set the list of directories to be
 548 searched at run time.  This overrides the default of building the list from the
 549 -L options.
 550
 551 * The COFF linker now combines debugging information for structs, unions, and
 552 enums, so that even if the same type is defined in multiple input files it will
 553 only be defined once in the output file.  The --traditional-format switch will
 554 prevent this optimization.
 555
 556 Changes in version 2.5:
 557
 558 * The linker now supports linking against SunOS shared libraries.  It still can
 559 not link SunOS PIC (Position Independent Code) files, so it can not be used to
 560 generate shared libraries.
 561
 562 * The linker now supports linking against ELF shared libraries for the i386
 563 (UnixWare) and SPARC (Solaris).  It can also link ELF PIC files, and can be
 564 used to generate shared libraries.  Shared library generation is not well
 565 tested; please report any problems encountered.  The linker is now enabled for
 566 Solaris again.
 567
 568 * Eric Youngdale has contributed Linux support code, including linking against
 569 Linux a.out shared libraries.  The linker produces Linux QMAGIC binaries.
 570
 571 * The ELF backend has been converted to the new linker code.  To use the new
 572 ELF linker, each particular target requires a relocation function.  So far,
 573 this function has been written for i386 (UnixWare), SPARC (Solaris) MIPS (Irix
 574 5), and HPPA ELF targets.
 575
 576 * The -( (--start-group) and -) (--end-group) options have been added to
 577 support searching a group of archives as though they were a single archive.
 578 This can also be used in a linker script, as GROUP ( files ).
 579
 580 * When a file is named on the command line, and the linker does not recognize
 581 it as an object file, the linker will now treat the file as a linker script
 582 file.  A linker script named in this way augments, but does not replace, the
 583 default linker script.
 584
 585 * The -warn-once option was added.  It causes the linker to only warn once per
 586 undefined symbol, rather than once per reference.
 587
 588 * The COFF backend has been converted to the new linker code.  As with ELF, to
 589 use the new linker, each particular target requires a relocation function.  So
 590 far, this function has been written for the i386, m68k, a29k and SH targets.
 591
 592 * The -V flag was made a synonym for -v, for SVR4 compatibility.  The old -V
 593 behaviour is available via --verbose.
 594
 595 Changes in version 2.4:
 596
 597 * New linker code, by Steve Chamberlain and Ian Taylor.  For a.out and ecoff
 598   formats (so far), this should result in considerable savings in time
 599   and memory used while linking; slightly poorer performance than
 600   before for formats not converted yet.
 601
 602 * Command-line parsing is no longer done with flex.  This means
 603   oddball characters in filenames won't get treated as argument
 604   separators.
 605
 606 * HP-PA ELF support, by Jeff Law.  (No SOM support yet.)
 607
 608 * Mach i386 support, by David Mackenzie.
 609
 610 * Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared
 611   libraries are not yet supported).
 612
 613 * COFF shared libraries (as on SCO) should work as well.
 614
 615 * The linker is disabled for Solaris.  (Actually, it was in 2.3 also, I just
 616   forgot to note it.)  Some of their C library routines don't work when
 617   statically linked, and the GNU linker doesn't support dynamic linking yet.
 618
 619 Changes in version 2.3:
 620
 621 * Weak symbols are now supported.
 622
 623 * ELF support has been added.  The linker has been bootstrapped on
 624   UnixWare and Solaris.
 625
 626 * Alpha OSF/1 support has been added (non dynamic linking only).
 627
 628 Changes in version 2.2:
 629
 630 * The `bfd' library has been updated to reduce a.out-format string
 631   table size.  The effect of this is that files linked from many input
 632   files with duplicate symbols (`-g' debugging records, or identical
 633   static symbols) should be much smaller.
 634
 635 Changes in version 2.1:
 636
 637 * The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented.
 638
 639 * There is now support for writing ECOFF files, so ld and the
 640   other utilities should work on Risc/Ultrix and Irix.
 641
 642 \f
 643 Copyright (C) 2012-2016 Free Software Foundation, Inc.
 644
 645 Copying and distribution of this file, with or without modification,
 646 are permitted in any medium without royalty provided the copyright
 647 notice and this notice are preserved.
 648
 649 Local variables:
 650 fill-column: 79
 651 End: