ld/NEWS

   1 -*- text -*-
   2
   3 Changes in 2.27:
   4
   5 * Add a configure option --enable-relro to decide whether -z relro should
   6   be enabled in ELF linker by default.  Default to yes for all Linux
   7   targets except FRV, HPPA, IA64 and MIPS.
   8
   9 * Support for -z noreloc-overflow in the x86-64 ELF linker to disable
  10   relocation overflow check.
  11
  12 * Add -z common/-z nocommon options for ELF targets to control whether to
  13   convert common symbols to the STT_COMMON type during a relocatable link.
  14
  15 * Support for -z nodynamic-undefined-weak in the x86 ELF linker, which
  16   avoids dynamic relocations against undefined weak symbols in executable.
  17
  18 * The NOCROSSREFSTO command was added to the linker script language.
  19
  20 * Add --no-apply-dynamic-relocs to the AArch64 linker to do not apply link-time
  21   values for dynamic relocations.
  22
  23 Changes in 2.26:
  24
  25 * Add --fix-stm32l4xx-629360 to the ARM linker to enable a link-time
  26   workaround for a bug in the bus matrix / memory controller for some of
  27   the STM32 Cortex-M4 based products (STM32L4xx)
  28
  29 * Add a configure option --enable-compressed-debug-sections={all,ld} to
  30   decide whether DWARF debug sections should be compressed by default.
  31
  32 * Add support for the ARC EM/HS, and ARC600/700 architectures.
  33
  34 * Experimental support for linker garbage collection (--gc-sections)
  35   has been enabled for COFF and PE based targets.
  36
  37 * New command line option for ELF targets to compress DWARF debug
  38   sections, --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi].
  39
  40 * New command line option, --orphan-handling=[place|warn|error|discard], to
  41   adjust how orphan sections are handled.  The default is 'place' which gives
  42   the current behaviour, 'warn' and 'error' issue a warning or error
  43   respectively when orphan sections are found, and 'discard' will discard all
  44   orphan sections.
  45
  46 * Add support for LLVM plugin.
  47
  48 * Add --print-memory-usage option to report memory blocks usage.
  49
  50 * Add --require-defined option, it's like --undefined except the new symbol
  51   must be defined by the end of the link.
  52
  53 Changes in 2.25:
  54
  55 * PE binaries now once again contain real timestamps by default.  To disable
  56   the inclusion of a timestamp in a PE binary, use the --no-insert-timestamp
  57   command line option.
  58
  59 * Replace support for openrisc and or32 with support for or1k.
  60
  61 * Add support for the --build-id command line option to COFF based targets.
  62
  63 * x86/x86_64 pe-coff now supports the --build-id option.
  64
  65 * Add support for the Andes NDS32.
  66
  67 Changes in 2.24:
  68
  69 * Add LOG2CEIL() builtin function to the linker script language
  70
  71 * Add support for the Texas Instruments MSP430X processor.
  72
  73 * Add support for Altera Nios II.
  74
  75 * Add support for the V850E3V5 architecture.
  76
  77 * Add support for the Imagination Technologies Meta processor.
  78
  79 * --enable-new-dtags no longer generates old dtags in addition to new dtags.
  80
  81 * Remove linker support for MIPS ECOFF targets.
  82
  83 * Add ALIGN_WITH_INPUT to the linker script language to force the alignment of
  84   an output section to use the maximum alignment of all its input sections.
  85
  86 Changes in 2.23:
  87
  88 * Enable compressed debug section feature for x86/x86_64 pe-coff.
  89
  90 * Add support for the 64-bit ARM architecture: AArch64.
  91
  92 * Added SORT_NONE to the linker script language to disable section sorting.
  93
  94 * Add a linker-provided symbol when producing ELF output, '__ehdr_start'
  95   to point to the ELF file header (and nearby program headers) in the
  96   program's memory image.
  97
  98 * Add support for S12X processor.
  99
 100 * Add support for the VLE extension to the PowerPC architecture.
 101
 102 * Add support for the Freescale XGATE architecture.
 103
 104 * Add option -f FILE on AIX (for response file).
 105
 106 * Add support for the Renesas RL78 architecture.
 107
 108 * Add support for the Adapteva EPIPHANY architecture.
 109
 110 Changes in 2.22:
 111
 112 * --copy-dt-needed-entries is no longer enabled by default.  Instead
 113   --no-copy-dt-needed-entries is the default.
 114
 115 * INPUT_SECTION_FLAGS has been added to the linker script language
 116   to allow selection of input sections by section header section flags.
 117
 118 * Add support for the Tilera TILEPro and TILE-Gx architectures.
 119
 120 * Added SORT_BY_INIT_PRIORITY to the linker script language to permit
 121   sorting sections by numerical value of the GCC init_priority attribute
 122   encoded in the section name.
 123
 124 Changes in 2.21:
 125
 126 * Linker script expression evaluation is somewhat more sane.  This may
 127   break scripts that depend on quirks of the old expression evaluation.
 128
 129 * Turn off underscoring for x86_64 PE+-COFF targets.  For old behavior the
 130   option --enable-leading-mingw64-underscores can be used on configure of
 131   bfd.
 132
 133 * Add support for the TMS320C6000 (TI C6X) processor family.
 134
 135 * --add-needed renamed to --copy-dt-needed-entries in order to avoid confusion
 136   with --as-needed option.
 137
 138 * Extend .def file syntax by '== <ID>' for imports and exports. This allows
 139   to alias the import/export table name written in PE image.
 140
 141 * Add --exclude-all-symbols option to PE based linkers.  This prevents all
 142   symbols from automatically being exported.
 143
 144 * Add support for the Renesas RX processor.
 145
 146 * Add support for alpha-vms target.
 147
 148 Changes in 2.20:
 149
 150 * GNU/Linux targets now support the STB_GNU_UNIQUE symbol binding.  This is a
 151   GNU extension to the standard set of ELF symbol bindings.  The binding will
 152   be passed on to the dynamic linker which will make sure that in the entire
 153   process there is just one symbol with the given name and type in use.
 154
 155 * PE targets now support a GNU extension to allow the alignment of common
 156   common symbols to be specified.  This support uses custom options in
 157   the .drectve section, which will be disregarded by the native tools.
 158
 159 * PE targets now add primitive support for ELF version scripts; symbols
 160   are not versioned, but the local and global symbol visibility directives
 161   are respected when filtering symbols in auto-export mode.
 162
 163 * New option --no-export-dynamic to undo the effect of the -E and
 164   --export-dynamic options.
 165
 166 * ELF: --warn-alternate-em option to warn if an object has alternate
 167   ELF machine code.
 168
 169 * New script function REGION_ALIAS to add alias names to memory regions.
 170
 171 * PE targets no longer make use of the long section names PE extension to
 172   the COFF format when generating executable images, by default.  The old
 173   (slightly non-conformant) behaviour can still be invoked by using the
 174   new '--enable-long-section-names' command-line option.  It is also enabled
 175   automatically in the presence of un-stripped debug information, as GDB
 176   needs to be able to find the debug info sections by their full names.
 177
 178 * For GNU/Linux systems the linker will now avoid processing any relocations
 179   made against symbols of the STT_GNU_IFUNC type and instead emit them into
 180   the resulting binary for processing by the loader.
 181
 182 * --as-needed now links in a dynamic library if it satisfies undefined
 183   symbols in regular objects, or in other dynamic libraries.  In the
 184   latter case the library is not linked if it is found in a DT_NEEDED
 185   entry of one of the libraries already linked.
 186
 187 * Add a new command line option, -Ttext-segment ADDR, for ELF targets
 188   to set the address of the first byte of the text segment.
 189
 190 * Add support for Sunplus score architecture.
 191
 192 * Add new option --use-nul-prefixed-import-tables to ld for PE targets to
 193   allow fallback to old import table generation with null element prefix.
 194
 195 * Windows PE systems now support a new --exclude-modules-for-implib option,
 196   allowing users to partition object files and archive members between a DLL
 197   and its associated import library as they are generated during linking.
 198
 199 * Add support for Lattice Mico32 (lm32) architecture.
 200
 201 * Add CR16 ELF --embedded-relocs (used to embedded relocations into binaries
 202   for Embedded-PIC code) option.
 203
 204 * Add to the PE/PE+ targets the support of two different kinds of
 205   pseudo-relocations.  They can be selected by the switches
 206   --enable-runtime-pseudo-reloc-v1 and --enable-runtime-pseudo-reloc-v2.
 207   For the switch --enable-runtime-pseudo-reloc it uses for 32-bit
 208   runtime pseudo relocation version one, for 64-bit the version two.
 209
 210 Changes in 2.19:
 211
 212 * Linker scripts support a new INSERT command that makes it easier to
 213   augment the default script.
 214
 215 * Linker script input section filespecs may now specify a file within an
 216   archive by writing "archive:file".
 217
 218 * The --sort-common switch now has an optional argument which specifies the
 219   direction of sorting.
 220
 221 * The M68K linker now supports multiple GOT generation schemes controlled via
 222   the --got=<type> command line option.
 223
 224 * The ARM EABI linker will now generate stubs for function calls to symbols
 225   that are too far away.  The placement of the stubs is controlled by a new
 226   linker command line option: --stub-group-size=N.
 227
 228 Changes in 2.18:
 229
 230 * Linker sources now released under version 3 of the GNU General Public
 231   License.
 232
 233 * ELF: New --build-id option to generate a unique per-binary identifier
 234   embedded in a note section.
 235
 236 * Added support for National Semicondutor CompactRISC (ie CR16) target.
 237
 238 * -l:foo now searches the library path for a filename called foo,
 239   without converting it to libfoo.a or libfoo.so.
 240
 241 * Add a new command line option '--default-script=FILE' or '-dT FILE'
 242   which specifies a replacement for the built in, default linker
 243   script.
 244
 245 * ELF: Add -Bsymbolic-functions, --dynamic-list-cpp-new, which puts C++
 246   operator new and delete on the dynamic list, and --dynamic-list-data,
 247   builtin list for --dynamic-list, which puts global data symbols on the
 248   dynamic list.
 249
 250 * Add support for x86_64 PE+ target.
 251
 252 * Add support for Score target.
 253
 254 * ELF: Add --dynamic-list option to specify a list of global symbols
 255   whose references shouldn't be bound to the definition within the
 256   shared library, or a list of symbols which should be added to the
 257   symbol table in the executable.
 258
 259 * The default output section LMA has changed for allocatable sections from
 260   being equal to VMA, to keeping the difference between LMA and VMA the same as
 261   the previous output section in the same region.  This is a more useful
 262   default when using overlays and other cases where you specify an LMA
 263   differing from the VMA for some sections.
 264
 265 * New switch: --print-gc-sections to list any sections removed by garabge
 266   collection.
 267
 268 * ARM: Added --vfp11-denorm-fix option to work around an erratum in current
 269   VFP11 coprocessors.
 270
 271 Changes in 2.17:
 272
 273 * Support for the Infineon XC16X has been added by KPIT Cummins Infosystems.
 274
 275 * Modify the Linux linker search order to better match ld.so search order.
 276   Look for DT_NEEDED libraries in paths specified by ld.so.conf before
 277   searching the default directories, rather than vice versa.
 278   Use $prefix/etc/ld.so.conf if it exists, otherwise /etc/ld.so.conf.
 279
 280 * PE-COFF: Forward exports from DLL's can now be specified in .def files
 281   passed directly to ld.
 282
 283 * Support for the Z80 processor family has been added.
 284
 285 * Add support for the "@<file>" syntax to the command line, so that extra
 286   switches can be read from <file>.
 287
 288 Changes in 2.16:
 289
 290 * Support for the R_ARM_V4BX relocation as defined in the ARM AAELF
 291   specification has been added via the --fix-v4bx command-line option.
 292
 293 * New linker script construct AS_NEEDED(), which sets the --as-needed flag
 294   for input files listed inside of it.
 295
 296 * A new command-line option, --sysroot, can be used to override the
 297   default sysroot location.  It only applies to toolchains that were
 298   configured using --with-sysroot.
 299
 300 * New linker script functions: ORIGIN() and LENGTH() which return information
 301   about a specified memory region.
 302
 303 * Port to MAXQ processor contributed by HCL Tech.
 304
 305 * Added SEGMENT_START to the linker script language to permit the user to
 306   override the base address for a segment from the command-line.
 307
 308 * ELF: --warn-shared-textrel option to warn if adding a DT_TEXTREL to a shared
 309   object.
 310
 311 * Added SORT_BY_NAME and SORT_BY_ALIGNMENT to the linker script
 312   language to permit sorting sections by section name or section
 313   maximum alignment.
 314
 315 * Added a new linker command line switch, --sort-section name|alignment,
 316   to sort sections by section name or maximum alignment.
 317
 318 * ELF: --add-needed/--no-add-needed options to control if a DT_NEEDED tag
 319   should be added when a shared library comes from DT_NEEDED tags.
 320
 321 * Support for the crx-elf target added.
 322
 323 * Support for the sh-symbianelf target added.
 324
 325 * A new linker command line switch has been added which allows the hash table
 326   size to be set to a suitable prime value near to its argument.  This switch
 327   is --hash-size=<NUMBER>.  Also if the switch --reduce-memory-overheads is
 328   used, and --hash-size has not been used, then the default value will be set
 329   to 1021.
 330
 331 * Linker map files are now generated with an O(N) algorithm for finding symbols
 332   that are defined in each section.  This uses about 40% more memory for
 333   symbols than the old O(N^2) algorithm.  You can use the new
 334   --reduce-memory-overheads option to select the old algorithm; this option
 335   might also be used in the future to select similar tradeoffs.
 336
 337 Changes in 2.15:
 338
 339 * ELF: --as-needed/--no-as-needed options to control if a DT_NEEDED tag should
 340   be added only when a shared library is referenced.
 341
 342 * PE: --large-address-aware option to indicate executables support virtual
 343   addresses greater than 2 gigabytes.
 344
 345 * DWARF 2 support for i386pe added.
 346
 347 * The linker script operator DEFINED() will now yield 1 only for a symbol that
 348   is defined before the statement where DEFINED is used.
 349
 350 * The MIPS --embedded-relocs (used to embed relocations into binaries for
 351   Embedded-PIC code) is deprecated and will be removed in a future release.
 352
 353 * cr16c support added by NSC.
 354
 355 * m32r Linux (ELF) support added by Renesas.
 356
 357 * Improved linker's handling of unresolved symbols.  The switch
 358   --unresolved-symbols=<method> has been added to tell the linker when it
 359   should report them and the switch --warn-unresolved-symbols has been added to
 360   make reports be issued as warning messages rather than errors.
 361
 362 Changes in 2.14:
 363
 364 * Added support for Xtensa architecture.
 365
 366 * Added --with-sysroot configure switch to specify a target system root, for
 367   linking against a target filesystem image.
 368
 369 * Added --accept-unknown-linker-format to restore old linker behaviour (pre
 370   2.14) of silently accepting and linking in any files in an unknown binary
 371   file format.
 372
 373 * Added --no-omagic to undo the effects of the -N option.
 374
 375 * Support for Texas Instruments TMS320C4x and TMS320C3x series of
 376   DSP's contributed by Michael Hayes and Svein E. Seldal.
 377
 378 * Added --with-lib-path configure switch to specify default value for
 379   LIB_PATH.
 380
 381 * ARM port to QNX operating system added by Graeme Peterson.
 382
 383 * IP2K support added by Denis Chertykov.
 384
 385 Changes in 2.13:
 386
 387 * Support for the Fujitsu FRV architecture added by Red Hat. Models for FR400
 388   and FR500 included.
 389
 390 Changes in version 2.13:
 391
 392 * DEC VAX ELF support, by Matt Thomas.
 393
 394 Changes in version 2.12:
 395
 396 * Support for Don Knuth's MMIX, by Hans-Peter Nilsson.
 397
 398 * Support for the OpenRISC 32-bit embedded processor by OpenCores.
 399
 400 * Support for -z nocopyreloc in the x86 ELF linker, which disables
 401   production of copy relocs.  Warning: using this option may result in
 402   non-sharable applications.
 403
 404 * Support for -z combreloc in the ELF linker, which puts dynamic
 405   relocations against the same symbol together, so that dynamic linker
 406   can use an one-entry symbol lookup cache.
 407
 408 * Support for ELF SHF_MERGE section merging, by Jakub Jelinek.
 409
 410 Changes in version 2.11:
 411
 412 * Support for AMD x86-64 architecture, by Jan Hubicka, SuSE Labs.
 413
 414 * Support added for eliminating duplicate DWARF2 debug information by
 415   having the compiler generate the information in sections called
 416   .gnu.linkonce.wi.XXXX where XXXX is a checksum for the contents.  The
 417   linker then merges these sections together into the normal .debug_info
 418   section.
 419
 420 * The native ELF linker now searches the directories in DT_RUNPATH or
 421   DT_RPATH of a shared library for shared libraries needed by it.
 422
 423 * TI C54x support, by Timothy Wall.
 424
 425 * Added command line switch --section-start to set the start address of any
 426   specified section.
 427
 428 * Added ability to emit full relocation information in linked executables,
 429   enabled by --emit-relocs.  Some post-linkage optimization tools need
 430   this information in order to be able to correctly identify and perform
 431   symbol relative addressing in the event of changes in section contents
 432   (instructions being added or deleted, extending data sections, etc.)
 433
 434 * Support for i860, by Jason Eckhardt (preliminary, alpha quality).
 435
 436 * Support for CRIS (Axis Communications ETRAX series).
 437
 438 * Support for PDP-11 and 2.11BSD a.out format, by Lars Brinkhoff.
 439
 440 Changes in version 2.10:
 441
 442 * Added AT> to the linker script language to allow load-time allocation of
 443   sections into regions.
 444
 445 * Added garbage collection of unused sections, enabled by --gc-sections.
 446   It does require a bit of backend support; currently implemented are
 447   arm-elf, avr-elf, d10v-elf, fr30-elf, i386-elf, m32r-elf, m68k-elf,
 448   mcore-elf, mips-elf, mn10300-elf, ppc-elf, sh-elf, sparc-elf, and v850-elf.
 449   Others will ignore the option.
 450
 451 * Added SORT to the linker script language to permit sorting sections by file
 452   name or section name.
 453
 454 * Added EXTERN to the linker script language as an equivalent to the -u
 455   command-line option.
 456
 457 * Added ASSERT to the linker script language.
 458
 459 * Added EXCLUDE_FILE to the linker script language for further control over
 460   wildcard file names.
 461
 462 * Added -O option to optimize linker output (as of this writing, this only
 463   affects ELF shared library generation).
 464
 465 * The -e option now accepts a number as well as a symbol name.
 466
 467 * Added --no-undefined option to disallow undefined symbols when creating a
 468   shared library.
 469
 470 * The linker now issues a warning, not an error, for an undefined symbol when
 471   using -Bsymbolic; use the new --no-undefined option to get the old
 472   behaviour.
 473
 474 * Added --demangle and --no-demangle options.
 475
 476 Changes in version 2.9:
 477
 478 * Added SQUAD to the linker script language.
 479
 480 * New option --no-warn-mismatch.
 481
 482 * The MEMORY command now parses the attributes to determine where sections that
 483   are not placed in a specific memory region are placed.
 484
 485 Changes in version 2.8:
 486
 487 * Linker scripts may now contain shell wildcard characters for file and section
 488   names.
 489
 490 * The linker now supports symbol versions in ELF.
 491
 492 * The NOCROSSREFS command was added to the linker script language.
 493
 494 * The LOADADDR expression was added to the linker script language.
 495
 496 * MAX and MIN functions were added to the linker script language.
 497
 498 * The OVERLAY construct was added to the linker script language.
 499
 500 * New option --warn-section-align to warn when the address of an output section
 501   changes due to alignment of an input section.
 502
 503 * New options --filter/-F and --auxiliary/-f.
 504
 505 Changes in version 2.7:
 506
 507 * New option --cref to print out a cross reference table.
 508
 509 * New option --wrap SYMBOL.
 510
 511 * New option --no-whole-archive, to turn off the effect of --whole-archive.
 512
 513 * Input sections assigned to the output section /DISCARD/ in the linker script
 514   are not included in the output file.
 515
 516 * The SunOS and ELF linkers now merge stabs debugging information which uses
 517   the N_BINCL and N_EINCL stab types.  This reduces the amount of debugging
 518   information generated.
 519
 520 Changes in version 2.6:
 521
 522 * When an ELF section name is representable as a C identifier (this is not true
 523 of most ELF section names), the linker will automatically define symbols
 524 __start_SECNAME and __stop_SECNAME, where SECNAME is the section name, at the
 525 beginning and the end of the section.  This is used by glibc.
 526
 527   Addendum: Current versions of the linker (at least for version 2.18 onwards
 528 and possibly much earlier as well) place two restrictions on this feature:  The
 529 symbols are only implemented for orphaned sections, not for explicitly placed
 530 sections and they are PROVIDEd rather than being defined.
 531
 532 * When an ELF section named .gnu.warning is encountered in an input file, the
 533 contents of the section are displayed as an error message, and the section is
 534 not copied into the output file.  This is used by glibc.
 535
 536 * When an ELF section named .gnu.warning.SYMBOL is encountered in an input
 537 file, and the symbol SYMBOL is referenced by some object file, the contents of
 538 the section are displayed as an error message.  The section is not copied into
 539 the output file, unless doing a relocatable or shared link.  This is used by
 540 glibc.
 541
 542 * New options -split-by-reloc and -split-by-file.
 543
 544 * The linker now supports linking PIC compiled code on SPARC SunOS.  It can
 545 also create SPARC SunOS shared libraries, and, like the native SunOS linker,
 546 will do so whenever there is an undefined symbol in the link and neither the -e
 547 nor the -r option was used.
 548
 549 * The -rpath option may be used on SunOS to set the list of directories to be
 550 searched at run time.  This overrides the default of building the list from the
 551 -L options.
 552
 553 * The COFF linker now combines debugging information for structs, unions, and
 554 enums, so that even if the same type is defined in multiple input files it will
 555 only be defined once in the output file.  The --traditional-format switch will
 556 prevent this optimization.
 557
 558 Changes in version 2.5:
 559
 560 * The linker now supports linking against SunOS shared libraries.  It still can
 561 not link SunOS PIC (Position Independent Code) files, so it can not be used to
 562 generate shared libraries.
 563
 564 * The linker now supports linking against ELF shared libraries for the i386
 565 (UnixWare) and SPARC (Solaris).  It can also link ELF PIC files, and can be
 566 used to generate shared libraries.  Shared library generation is not well
 567 tested; please report any problems encountered.  The linker is now enabled for
 568 Solaris again.
 569
 570 * Eric Youngdale has contributed Linux support code, including linking against
 571 Linux a.out shared libraries.  The linker produces Linux QMAGIC binaries.
 572
 573 * The ELF backend has been converted to the new linker code.  To use the new
 574 ELF linker, each particular target requires a relocation function.  So far,
 575 this function has been written for i386 (UnixWare), SPARC (Solaris) MIPS (Irix
 576 5), and HPPA ELF targets.
 577
 578 * The -( (--start-group) and -) (--end-group) options have been added to
 579 support searching a group of archives as though they were a single archive.
 580 This can also be used in a linker script, as GROUP ( files ).
 581
 582 * When a file is named on the command line, and the linker does not recognize
 583 it as an object file, the linker will now treat the file as a linker script
 584 file.  A linker script named in this way augments, but does not replace, the
 585 default linker script.
 586
 587 * The -warn-once option was added.  It causes the linker to only warn once per
 588 undefined symbol, rather than once per reference.
 589
 590 * The COFF backend has been converted to the new linker code.  As with ELF, to
 591 use the new linker, each particular target requires a relocation function.  So
 592 far, this function has been written for the i386, m68k, a29k and SH targets.
 593
 594 * The -V flag was made a synonym for -v, for SVR4 compatibility.  The old -V
 595 behaviour is available via --verbose.
 596
 597 Changes in version 2.4:
 598
 599 * New linker code, by Steve Chamberlain and Ian Taylor.  For a.out and ecoff
 600   formats (so far), this should result in considerable savings in time
 601   and memory used while linking; slightly poorer performance than
 602   before for formats not converted yet.
 603
 604 * Command-line parsing is no longer done with flex.  This means
 605   oddball characters in filenames won't get treated as argument
 606   separators.
 607
 608 * HP-PA ELF support, by Jeff Law.  (No SOM support yet.)
 609
 610 * Mach i386 support, by David Mackenzie.
 611
 612 * Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared
 613   libraries are not yet supported).
 614
 615 * COFF shared libraries (as on SCO) should work as well.
 616
 617 * The linker is disabled for Solaris.  (Actually, it was in 2.3 also, I just
 618   forgot to note it.)  Some of their C library routines don't work when
 619   statically linked, and the GNU linker doesn't support dynamic linking yet.
 620
 621 Changes in version 2.3:
 622
 623 * Weak symbols are now supported.
 624
 625 * ELF support has been added.  The linker has been bootstrapped on
 626   UnixWare and Solaris.
 627
 628 * Alpha OSF/1 support has been added (non dynamic linking only).
 629
 630 Changes in version 2.2:
 631
 632 * The `bfd' library has been updated to reduce a.out-format string
 633   table size.  The effect of this is that files linked from many input
 634   files with duplicate symbols (`-g' debugging records, or identical
 635   static symbols) should be much smaller.
 636
 637 Changes in version 2.1:
 638
 639 * The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented.
 640
 641 * There is now support for writing ECOFF files, so ld and the
 642   other utilities should work on Risc/Ultrix and Irix.
 643
 644 \f
 645 Copyright (C) 2012-2016 Free Software Foundation, Inc.
 646
 647 Copying and distribution of this file, with or without modification,
 648 are permitted in any medium without royalty provided the copyright
 649 notice and this notice are preserved.
 650
 651 Local variables:
 652 fill-column: 79
 653 End: