545 lines
21 KiB
Plaintext
545 lines
21 KiB
Plaintext
-*- text -*-
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* Add support for the Renesas RL78 architecture.
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* Add support for the Adapteva EPIPHANY architecture.
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Changes in 2.22:
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* --copy-dt-needed-entries is no longer enabled by default. Instead
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--no-copy-dt-needed-entries is the default.
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* INPUT_SECTION_FLAGS has been added to the linker script language
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to allow selection of input sections by section header section flags.
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* Add support for the Tilera TILEPro and TILE-Gx architectures.
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* Added SORT_BY_INIT_PRIORITY to the linker script language to permit
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sorting sections by numerical value of the GCC init_priority attribute
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encoded in the section name.
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Changes in 2.21:
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* Linker script expression evaluation is somewhat more sane. This may
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break scripts that depend on quirks of the old expression evaluation.
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* Turn off underscoring for x86_64 PE+-COFF targets. For old behavior the
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option --enable-leading-mingw64-underscores can be used on configure of
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bfd.
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* Add support for the TMS320C6000 (TI C6X) processor family.
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* --add-needed renamed to --copy-dt-needed-entries in order to avoid confusion
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with --as-needed option.
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* Extend .def file syntax by '== <ID>' for imports and exports. This allows
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to alias the import/export table name written in PE image.
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* Add --exlcude-all-symbols option to PE based linkers. This prevents all
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symbols from automatically being exported.
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* Add support for the Renesas RX processor.
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* Add support for alpha-vms target.
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Changes in 2.20:
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* GNU/Linux targets now support the STB_GNU_UNIQUE symbol binding. This is a
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GNU extension to the standard set of ELF symbol bindings. The binding will
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be passed on to the dynamic linker which will make sure that in the entire
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process there is just one symbol with the given name and type in use.
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* PE targets now support a GNU extension to allow the alignment of common
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common symbols to be specified. This support uses custom options in
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the .drectve section, which will be disregarded by the native tools.
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* PE targets now add primitive support for ELF version scripts; symbols
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are not versioned, but the local and global symbol visibility directives
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are respected when filtering symbols in auto-export mode.
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* New option --no-export-dynamic to undo the effect of the -E and
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--export-dynamic options.
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* ELF: --warn-alternate-em option to warn if an object has alternate
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ELF machine code.
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* New script function REGION_ALIAS to add alias names to memory regions.
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* PE targets no longer make use of the long section names PE extension to
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the COFF format when generating executable images, by default. The old
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(slightly non-conformant) behaviour can still be invoked by using the
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new '--enable-long-section-names' command-line option. It is also enabled
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automatically in the presence of un-stripped debug information, as GDB
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needs to be able to find the debug info sections by their full names.
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* For GNU/Linux systems the linker will now avoid processing any relocations
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made against symbols of the STT_GNU_IFUNC type and instead emit them into
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the resulting binary for processing by the loader.
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* --as-needed now links in a dynamic library if it satisfies undefined
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symbols in regular objects, or in other dynamic libraries. In the
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latter case the library is not linked if it is found in a DT_NEEDED
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entry of one of the libraries already linked.
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* Add a new command line option, -Ttext-segment ADDR, for ELF targets
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to set the address of the first byte of the text segment.
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* Add support for Sunplus score architecture.
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* Add new option --use-nul-prefixed-import-tables to ld for PE targets to
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allow fallback to old import table generation with null element prefix.
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* Windows PE systems now support a new --exclude-modules-for-implib option,
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allowing users to partition object files and archive members between a DLL
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and its associated import library as they are generated during linking.
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* Add support for Lattice Mico32 (lm32) architecture.
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* Add CR16 ELF --embedded-relocs (used to embedded relocations into binaries
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for Embedded-PIC code) option.
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* Add to the PE/PE+ targets the support of two different kinds of
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pseudo-relocations. They can be selected by the switches
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--enable-runtime-pseudo-reloc-v1 and --enable-runtime-pseudo-reloc-v2.
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For the switch --enable-runtime-pseudo-reloc it uses for 32-bit
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runtime pseudo relocation version one, for 64-bit the version two.
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Changes in 2.19:
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* Linker scripts support a new INSERT command that makes it easier to
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augment the default script.
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* Linker script input section filespecs may now specify a file within an
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archive by writing "archive:file".
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* The --sort-common switch now has an optional argument which specifies the
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direction of sorting.
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* The M68K linker now supports multiple GOT generation schemes controlled via
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the --got=<type> command line option.
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* The ARM EABI linker will now generate stubs for function calls to symbols
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that are too far away. The placement of the stubs is controlled by a new
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linker command line option: --stub-group-size=N.
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Changes in 2.18:
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* Linker sources now released under version 3 of the GNU General Public
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License.
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* ELF: New --build-id option to generate a unique per-binary identifier
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embedded in a note section.
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* Added support for National Semicondutor CompactRISC (ie CR16) target.
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* -l:foo now searches the library path for a filename called foo,
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without converting it to libfoo.a or libfoo.so.
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* Add a new command line option '--default-script=FILE' or '-dT FILE'
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which specifies a replacement for the built in, default linker
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script.
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* ELF: Add -Bsymbolic-functions, --dynamic-list-cpp-new, which puts C++
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operator new and delete on the dynamic list, and --dynamic-list-data,
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builtin list for --dynamic-list, which puts global data symbols on the
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dynamic list.
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* Add support for x86_64 PE+ target.
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* Add support for Score target.
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* ELF: Add --dynamic-list option to specify a list of global symbols
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whose references shouldn't be bound to the definition within the
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shared library, or a list of symbols which should be added to the
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symbol table in the executable.
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* The default output section LMA has changed for allocatable sections from
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being equal to VMA, to keeping the difference between LMA and VMA the same as
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the previous output section in the same region. This is a more useful
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default when using overlays and other cases where you specify an LMA
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differing from the VMA for some sections.
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* New switch: --print-gc-sections to list any sections removed by garabge
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collection.
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* ARM: Added --vfp11-denorm-fix option to work around an erratum in current
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VFP11 coprocessors.
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Changes in 2.17:
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* Support for the Infineon XC16X has been added by KPIT Cummins Infosystems.
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* Modify the Linux linker search order to better match ld.so search order.
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Look for DT_NEEDED libraries in paths specified by ld.so.conf before
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searching the default directories, rather than vice versa.
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Use $prefix/etc/ld.so.conf if it exists, otherwise /etc/ld.so.conf.
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* PE-COFF: Forward exports from DLL's can now be specified in .def files
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passed directly to ld.
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* Support for the Z80 processor family has been added.
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* Add support for the "@<file>" syntax to the command line, so that extra
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switches can be read from <file>.
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Changes in 2.16:
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* Support for the R_ARM_V4BX relocation as defined in the ARM AAELF
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specification has been added via the --fix-v4bx command-line option.
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* New linker script construct AS_NEEDED(), which sets the --as-needed flag
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for input files listed inside of it.
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* A new command-line option, --sysroot, can be used to override the
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default sysroot location. It only applies to toolchains that were
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configured using --with-sysroot.
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* New linker script functions: ORIGIN() and LENGTH() which return information
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about a specified memory region.
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* Port to MAXQ processor contributed by HCL Tech.
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* Added SEGMENT_START to the linker script language to permit the user to
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override the base address for a segment from the command-line.
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* ELF: --warn-shared-textrel option to warn if adding a DT_TEXTREL to a shared
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object.
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* Added SORT_BY_NAME and SORT_BY_ALIGNMENT to the linker script
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language to permit sorting sections by section name or section
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maximum alignment.
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* Added a new linker command line switch, --sort-section name|alignment,
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to sort sections by section name or maximum alignment.
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* ELF: --add-needed/--no-add-needed options to control if a DT_NEEDED tag
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should be added when a shared library comes from DT_NEEDED tags.
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* Support for the crx-elf target added.
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* Support for the sh-symbianelf target added.
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* A new linker command line switch has been added which allows the hash table
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size to be set to a suitable prime value near to its argument. This switch
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is --hash-size=<NUMBER>. Also if the switch --reduce-memory-overheads is
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used, and --hash-size has not been used, then the default value will be set
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to 1021.
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* Linker map files are now generated with an O(N) algorithm for finding symbols
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that are defined in each section. This uses about 40% more memory for
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symbols than the old O(N^2) algorithm. You can use the new
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--reduce-memory-overheads option to select the old algorithm; this option
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might also be used in the future to select similar tradeoffs.
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Changes in 2.15:
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* ELF: --as-needed/--no-as-needed options to control if a DT_NEEDED tag should
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be added only when a shared library is referenced.
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* PE: --large-address-aware option to indicate executables support virtual
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addresses greater than 2 gigabytes.
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* DWARF 2 support for i386pe added.
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* The linker script operator DEFINED() will now yield 1 only for a symbol that
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is defined before the statement where DEFINED is used.
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* The MIPS --embedded-relocs (used to embed relocations into binaries for
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Embedded-PIC code) is deprecated and will be removed in a future release.
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* cr16c support added by NSC.
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* m32r Linux (ELF) support added by Renesas.
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* Improved linker's handling of unresolved symbols. The switch
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--unresolved-symbols=<method> has been added to tell the linker when it
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should report them and the switch --warn-unresolved-symbols has been added to
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make reports be issued as warning messages rather than errors.
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Changes in 2.14:
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* Added support for Xtensa architecture.
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* Added --with-sysroot configure switch to specify a target system root, for
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linking against a target filesystem image.
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* Added --accept-unknown-linker-format to restore old linker behaviour (pre
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2.14) of silently accepting and linking in any files in an unknown binary
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file format.
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* Added --no-omagic to undo the effects of the -N option.
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* Support for Texas Instruments TMS320C4x and TMS320C3x series of
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DSP's contributed by Michael Hayes and Svein E. Seldal.
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* Added --with-lib-path configure switch to specify default value for
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LIB_PATH.
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* ARM port to QNX operating system added by Graeme Peterson.
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* IP2K support added by Denis Chertykov.
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Changes in 2.13:
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* Support for the Fujitsu FRV architecture added by Red Hat. Models for FR400
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and FR500 included.
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Changes in version 2.13:
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* DEC VAX ELF support, by Matt Thomas.
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Changes in version 2.12:
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* Support for Don Knuth's MMIX, by Hans-Peter Nilsson.
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* Support for the OpenRISC 32-bit embedded processor by OpenCores.
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* Support for -z nocopyreloc in the x86 ELF linker, which disables
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production of copy relocs. Warning: using this option may result in
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non-sharable applications.
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* Support for -z combreloc in the ELF linker, which puts dynamic
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relocations against the same symbol together, so that dynamic linker
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can use an one-entry symbol lookup cache.
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* Support for ELF SHF_MERGE section merging, by Jakub Jelinek.
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Changes in version 2.11:
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* Support for AMD x86-64 architecture, by Jan Hubicka, SuSE Labs.
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* Support added for eliminating duplicate DWARF2 debug information by
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having the compiler generate the information in sections called
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.gnu.linkonce.wi.XXXX where XXXX is a checksum for the contents. The
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linker then merges these sections together into the normal .debug_info
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section.
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* The native ELF linker now searches the directories in DT_RUNPATH or
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DT_RPATH of a shared library for shared libraries needed by it.
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* TI C54x support, by Timothy Wall.
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* Added command line switch --section-start to set the start address of any
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specified section.
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* Added ability to emit full relocation information in linked executables,
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enabled by --emit-relocs. Some post-linkage optimization tools need
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this information in order to be able to correctly identify and perform
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symbol relative addressing in the event of changes in section contents
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(instructions being added or deleted, extending data sections, etc.)
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* Support for i860, by Jason Eckhardt (preliminary, alpha quality).
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* Support for CRIS (Axis Communications ETRAX series).
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* Support for PDP-11 and 2.11BSD a.out format, by Lars Brinkhoff.
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Changes in version 2.10:
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* Added AT> to the linker script language to allow load-time allocation of
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sections into regions.
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* Added garbage collection of unused sections, enabled by --gc-sections.
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It does require a bit of backend support; currently implemented are
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arm-elf, avr-elf, d10v-elf, fr30-elf, i386-elf, m32r-elf, m68k-elf,
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mcore-elf, mips-elf, mn10300-elf, ppc-elf, sh-elf, sparc-elf, and v850-elf.
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Others will ignore the option.
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* Added SORT to the linker script language to permit sorting sections by file
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name or section name.
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* Added EXTERN to the linker script language as an equivalent to the -u
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command-line option.
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* Added ASSERT to the linker script language.
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* Added EXCLUDE_FILE to the linker script language for further control over
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wildcard file names.
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* Added -O option to optimize linker output (as of this writing, this only
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affects ELF shared library generation).
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* The -e option now accepts a number as well as a symbol name.
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* Added --no-undefined option to disallow undefined symbols when creating a
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shared library.
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* The linker now issues a warning, not an error, for an undefined symbol when
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using -Bsymbolic; use the new --no-undefined option to get the old
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behaviour.
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* Added --demangle and --no-demangle options.
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Changes in version 2.9:
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* Added SQUAD to the linker script language.
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* New option --no-warn-mismatch.
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* The MEMORY command now parses the attributes to determine where sections that
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are not placed in a specific memory region are placed.
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Changes in version 2.8:
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* Linker scripts may now contain shell wildcard characters for file and section
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names.
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* The linker now supports symbol versions in ELF.
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* The NOCROSSREFS command was added to the linker script language.
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* The LOADADDR expression was added to the linker script language.
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* MAX and MIN functions were added to the linker script language.
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* The OVERLAY construct was added to the linker script language.
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* New option --warn-section-align to warn when the address of an output section
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changes due to alignment of an input section.
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* New options --filter/-F and --auxiliary/-f.
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Changes in version 2.7:
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* New option --cref to print out a cross reference table.
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* New option --wrap SYMBOL.
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* New option --no-whole-archive, to turn off the effect of --whole-archive.
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* Input sections assigned to the output section /DISCARD/ in the linker script
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are not included in the output file.
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* The SunOS and ELF linkers now merge stabs debugging information which uses
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the N_BINCL and N_EINCL stab types. This reduces the amount of debugging
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||
information generated.
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Changes in version 2.6:
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* When an ELF section name is representable as a C identifier (this is not true
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of most ELF section names), the linker will automatically define symbols
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__start_SECNAME and __stop_SECNAME, where SECNAME is the section name, at the
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beginning and the end of the section. This is used by glibc.
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Addendum: Current versions of the linker (at least for version 2.18 onwards
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and possibly much earlier as well) place two restrictions on this feature: The
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symbols are only implemented for orphaned sections, not for explicitly placed
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sections and they are PROVIDEd rather than being defined.
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* When an ELF section named .gnu.warning is encountered in an input file, the
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||
contents of the section are displayed as an error message, and the section is
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||
not copied into the output file. This is used by glibc.
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* When an ELF section named .gnu.warning.SYMBOL is encountered in an input
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||
file, and the symbol SYMBOL is referenced by some object file, the contents of
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the section are displayed as an error message. The section is not copied into
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the output file, unless doing a relocatable or shared link. This is used by
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glibc.
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* New options -split-by-reloc and -split-by-file.
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||
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* The linker now supports linking PIC compiled code on SPARC SunOS. It can
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||
also create SPARC SunOS shared libraries, and, like the native SunOS linker,
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will do so whenever there is an undefined symbol in the link and neither the -e
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nor the -r option was used.
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* The -rpath option may be used on SunOS to set the list of directories to be
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||
searched at run time. This overrides the default of building the list from the
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||
-L options.
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||
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||
* The COFF linker now combines debugging information for structs, unions, and
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||
enums, so that even if the same type is defined in multiple input files it will
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||
only be defined once in the output file. The --traditional-format switch will
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||
prevent this optimization.
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||
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Changes in version 2.5:
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||
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* The linker now supports linking against SunOS shared libraries. It still can
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||
not link SunOS PIC (Position Independent Code) files, so it can not be used to
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||
generate shared libraries.
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||
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* The linker now supports linking against ELF shared libraries for the i386
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(UnixWare) and SPARC (Solaris). It can also link ELF PIC files, and can be
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||
used to generate shared libraries. Shared library generation is not well
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||
tested; please report any problems encountered. The linker is now enabled for
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Solaris again.
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* Eric Youngdale has contributed Linux support code, including linking against
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Linux a.out shared libraries. The linker produces Linux QMAGIC binaries.
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||
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* The ELF backend has been converted to the new linker code. To use the new
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||
ELF linker, each particular target requires a relocation function. So far,
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||
this function has been written for i386 (UnixWare), SPARC (Solaris) MIPS (Irix
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5), and HPPA ELF targets.
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||
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* The -( (--start-group) and -) (--end-group) options have been added to
|
||
support searching a group of archives as though they were a single archive.
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||
This can also be used in a linker script, as GROUP ( files ).
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||
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* When a file is named on the command line, and the linker does not recognize
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it as an object file, the linker will now treat the file as a linker script
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||
file. A linker script named in this way augments, but does not replace, the
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||
default linker script.
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||
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* The -warn-once option was added. It causes the linker to only warn once per
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||
undefined symbol, rather than once per reference.
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||
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* The COFF backend has been converted to the new linker code. As with ELF, to
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||
use the new linker, each particular target requires a relocation function. So
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||
far, this function has been written for the i386, m68k, a29k and SH targets.
|
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* The -V flag was made a synonym for -v, for SVR4 compatibility. The old -V
|
||
behaviour is available via --verbose.
|
||
|
||
Changes in version 2.4:
|
||
|
||
* New linker code, by Steve Chamberlain and Ian Taylor. For a.out and ecoff
|
||
formats (so far), this should result in considerable savings in time
|
||
and memory used while linking; slightly poorer performance than
|
||
before for formats not converted yet.
|
||
|
||
* Command-line parsing is no longer done with flex. This means
|
||
oddball characters in filenames won't get treated as argument
|
||
separators.
|
||
|
||
* HP-PA ELF support, by Jeff Law. (No SOM support yet.)
|
||
|
||
* Mach i386 support, by David Mackenzie.
|
||
|
||
* Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared
|
||
libraries are not yet supported).
|
||
|
||
* COFF shared libraries (as on SCO) should work as well.
|
||
|
||
* The linker is disabled for Solaris. (Actually, it was in 2.3 also, I just
|
||
forgot to note it.) Some of their C library routines don't work when
|
||
statically linked, and the GNU linker doesn't support dynamic linking yet.
|
||
|
||
Changes in version 2.3:
|
||
|
||
* Weak symbols are now supported.
|
||
|
||
* ELF support has been added. The linker has been bootstrapped on
|
||
UnixWare and Solaris.
|
||
|
||
* Alpha OSF/1 support has been added (non dynamic linking only).
|
||
|
||
Changes in version 2.2:
|
||
|
||
* The `bfd' library has been updated to reduce a.out-format string
|
||
table size. The effect of this is that files linked from many input
|
||
files with duplicate symbols (`-g' debugging records, or identical
|
||
static symbols) should be much smaller.
|
||
|
||
Changes in version 2.1:
|
||
|
||
* The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented.
|
||
|
||
* There is now support for writing ECOFF files, so ld and the
|
||
other utilities should work on Risc/Ultrix and Irix.
|
||
|
||
|
||
Local variables:
|
||
fill-column: 79
|
||
End:
|