Writing > Linkers and connectors
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GNU Binutils
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The GNU Binutils are a collection of binary tools. The main ones are:
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- ld - the GNU linker.
- as - the GNU assembler.
But they also include:
- addr2line - Converts addresses into filenames and line numbers.
- ar - A utility for creating, modifying and extracting from archives.
- c++filt - Filter to demangle encoded C++ symbols.
- dlltool - Creates files for building and using DLLs.
- gold - A new, faster, ELF only linker, still in beta test.
- gprof - Displays profiling information.
- nlmconv - Converts object code into an NLM.
- nm - Lists symbols from object files.
- objcopy - Copies and translates object files.
- objdump - Displays information from object files.
- ranlib - Generates an index to the contents of an archive.
- readelf - Displays information from any ELF format object file.
- size - Lists the section sizes of an object or archive file.
- strings - Lists printable strings from files.
- strip - Discards symbols.
- windmc - A Windows compatible message compiler.
- windres - A compiler for Windows resource files.
Most of these programs use BFD, the Binary File Descriptor library, to do low-level manipulation. Many of them also use the opcodes library to assemble and disassemble machine instructions.
The binutils have been ported to most major Unix variants as well as Wintel systems, and their main reason for existence is to give the GNU system (and GNU/Linux) the facility to compile and link programs.
Obtaining binutils
The latest release of GNU binutils is 2.36. The various NEWS files (binutils, gas, and ld) have details of what has changed in this release.
See the SOFTWARE page for information on obtaining releases of GNU binutils and other GNU software. The current release can be downloaded from https://ftp.gnu.org/gnu/binutils or, preferably, from a nearby mirror through the generic URL https://ftpmirror.gnu.org/binutils.
If you plan to do active work on GNU binutils, you can access the development source tree by anonymous git:
git clone git://sourceware.org/git/binutils-gdb.git
Alternatively, you can use the gitweb interface, or the source snapshots, available as bzipped tar files via anonymous FTP from ftp://sourceware.org/pub/binutils/snapshots.
Bug reports
There is a bug-tracking system at https://sourceware.org/bugzilla/.
Mailing lists
There are three binutils mailing lists:
- <bug-binutils@gnu.org> (archives)
- For reporting bugs.
- <binutils@sourceware.org> (archives)
- For discussing binutils issues.
- binutils-cvs (archives)
- A read-only mailing list containing the notes from checkins to the binutils git repository. (This list has an odd name for historical reasons.)
You can use this form to subscribe to the binutils@sourceware.org
or binutils-cvs@sourceware.org
mailing lists:
To subscribe to the bug-binutils@gnu.org
mailing list, see the bug-binutils info page.
You may wish to browse the old mail archives of the gas2 and bfd mailing lists. These were the discussion lists for binutils until May 1999. Please do not send mail to them any longer.
A New Inheritance
Documentation
The documentation for binutils 2.36 is available.
A New Link
A guide to porting the binutils to a new target has been contributed.