db6751f2e7
(struct elf_backend_data): Add elf_backend_reloc_type_class. (_bfd_elf_reloc_type_class): New. * elfxx-target.h (elf_backend_reloc_type_class): Define. (elfNN_bed): Add elf_backend_reloc_type_class. * elf.c (_bfd_elf_reloc_type_class): New. * elf32-i386.c (elf_i386_check_relocs): Set DF_TEXTREL if the reloc is against read-only section. (elf_i386_size_dynamic_sections): Use DF_TEXTREL flag instead of looking up section names for DT_TEXTREL. (elf_i386_reloc_type_class): New. (elf_backend_reloc_type_class): Define. * elf32-sparc.c (elf32_sparc_check_relocs): Set DF_TEXTREL if the reloc is against read-only section. (elf32_sparc_size_dynamic_sections): Use DF_TEXTREL flag instead of looking up section names for DT_TEXTREL. (elf32_sparc_reloc_type_class): New. (elf_backend_reloc_type_class): Define. * elf64-sparc.c (sparc64_elf_check_relocs): Set DF_TEXTREL if the reloc is against read-only section. (sparc64_elf_size_dynamic_sections): Use DF_TEXTREL flag instead of looking up section names for DT_TEXTREL. (sparc64_elf_reloc_type_class): New. (elf_backend_reloc_type_class): Define. * elfxx-ia64.c (struct elfNN_ia64_link_hash_table): Add reltext field. (elfNN_ia64_hash_table_create): Clear ia64_info. (get_reloc_section): Set DF_TEXTREL if the reloc is against read-only section. (elfNN_ia64_size_dynamic_sections): Use ia64_info->reltext flag instead of looking up section names for DT_TEXTREL. (elfNN_ia64_reloc_type_class): New. (elf_backend_reloc_type_class): Define. * elflink.h (size_dynamic_sections): Add spare DT_NULL tags. (struct elf_link_sort_rela): New. (elf_link_sort_cmp1, elf_link_sort_cmp2, elf_link_sort_relocs): New. (elf_bfd_final_link): Call elf_link_sort_relocs. Convert one spare DT_NULL into DT_RELCOUNT resp. DT_RELACOUNT if necessary. * bfdlink.h (struct bfd_link_info): Add combreloc and spare_dynamic_tags fields. * emultempl/elf32.em (place_orphan): Place orphan .rel* sections into .rel.dyn resp. .rela.dyn if combreloc. (get_script): If .x linker script is equal to .xn, only put it once into the binary. Add .xc and .xsc scripts. (parse_args): Handle -z combreloc and -z nocombreloc. * scripttempl/elf.sc (.rela.sbss): Fix a typo. For .xc and .xsc scripts put all .rel* or .rela* input sections but .rel*.plt and PLT-like sections into .rel.dyn resp. .rela.dyn. * genscripts.sh (GENERATE_COMBRELOC_SCRIPT): Set if SCRIPT_NAME is elf. Strip trailing whitespace from script. Generate .xc and .xsc scripts if requested. * ldmain.c (main): Initialize link_info.combreloc and link_info.spare_dynamic_tags. * lexsup.c (OPTION_SPARE_DYNAMIC_TAGS): Define. (ld_options): Add --spare-dynamic-tags option. (parse_args): Likewise. * ld.texinfo: Document -z combreloc and -z nocombreloc. * ldint.texinfo: Document .xc and .xsc linker scripts. * NEWS: Add notes about -z combreloc and SHF_MERGE.
238 lines
9.0 KiB
Plaintext
238 lines
9.0 KiB
Plaintext
-*- text -*-
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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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* 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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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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