9c8ebd6a51
* Makefile.am (ldmain.o): Add @TARGET_SYSTEM_ROOT_DEFINE@.
(GENSCRIPTS): Add @use_sysroot@.
* Makefile.in: Regenerated.
* configure.host: Move setting of NATIVE_LIB_DIRS to...
* configure.tgt: ... here. Use ${target} instead of ${host}
for NATIVE_LIB_DIRS.
* configure.in: Add --with-sysroot.
* configure: Regenerated.
* genscripts.sh: Accept use_sysroot option. Set new variables
NATIVE and USE_LIBPATH. Prepend "=" to directory names if
$use_sysroot. Don't search $tool_lib if $use_sysroot.
* ldfile.c (ldfile_add_library_path): Handle leading '='.
* ldmain.c (TARGET_SYSTEM_ROOT): Define if not defined.
(ld_sysroot): New variable.
(main): Initialize ld_sysroot.
* ldmain.h (ld_sysroot): New extern.
* emultempl/elf32.em: Use NATIVE and USE_LIBPATH instead of
searching $EMULATION_LIBPATH.
(gld${EMULATION_NAME}_add_sysroot): New function.
(gld${EMULATION_NAME}_check_ld_so_conf): Use it. Honor ld_sysroot.
(gld${EMULATION_NAME}_after_open): Likewise. Only search
environment variables if $NATIVE.
* ld.texinfo (Options): Mention "=" prefix in the description of -L.
* NEWS: Mention --with-sysroot.
* emulparams/elf32bmipn32-defs.sh: Set NATIVE and LIBPATH_SUFFIX
instead of setting LIB_PATH.
* emulparams/elf32ppc.sh: Likewise.
* emulparams/elf64_s390.sh: Likewise.
* emulparams/elf64_sparc.sh: Likewise.
* emulparams/elf64ppc.sh: Likewise.
* emulparams/elf_x86_64.sh: Likewise.
* emulparams/elf64_aix.sh: Add "=" prefixes to LIB_PATH.
* emulparams/elf64hppa.sh: Add "=" prefixes to LIB_PATH.
280 lines
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280 lines
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Plaintext
-*- text -*-
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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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* 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 relocateable 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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* 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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* 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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Changes in version 2.5:
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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 libaries.
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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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* 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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* The -( (--start-group) and -) (--end-group) options have been added to
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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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* 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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* 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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* 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
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behaviour is available via --verbose.
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Changes in version 2.4:
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* New linker code, by Steve Chamberlain and Ian Taylor. For a.out and ecoff
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formats (so far), this should result in considerable savings in time
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and memory used while linking; slightly poorer performance than
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before for formats not converted yet.
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* Command-line parsing is no longer done with flex. This means
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oddball characters in filenames won't get treated as argument
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separators.
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* HP-PA ELF support, by Jeff Law. (No SOM support yet.)
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* Mach i386 support, by David Mackenzie.
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* Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared
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libraries are not yet supported).
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* COFF shared libraries (as on SCO) should work as well.
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* The linker is disabled for Solaris. (Actually, it was in 2.3 also, I just
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forgot to note it.) Some of their C library routines don't work when
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statically linked, and the GNU linker doesn't support dynamic linking yet.
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Changes in version 2.3:
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* Weak symbols are now supported.
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* ELF support has been added. The linker has been bootstrapped on
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UnixWare and Solaris.
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* Alpha OSF/1 support has been added (non dynamic linking only).
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Changes in version 2.2:
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* The `bfd' library has been updated to reduce a.out-format string
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table size. The effect of this is that files linked from many input
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files with duplicate symbols (`-g' debugging records, or identical
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static symbols) should be much smaller.
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Changes in version 2.1:
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* The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented.
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* There is now support for writing ECOFF files, so ld and the
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other utilities should work on Risc/Ultrix and Irix.
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Local variables:
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fill-column: 79
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End:
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