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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gold/] [README] - Blame information for rev 27

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1 27 khays
gold is an ELF linker.  It is intended to have complete support for
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ELF and to run as fast as possible on modern systems.  For normal use
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it is a drop-in replacement for the older GNU linker.
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gold is part of the GNU binutils.  See ../binutils/README for more
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general notes, including where to send bug reports.
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gold was originally developed at Google, and was contributed to the
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Free Software Foundation in March 2008.  At Google it was designed by
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Ian Lance Taylor, with major contributions by Cary Coutant, Craig
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Silverstein, and Andrew Chatham.
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The existing GNU linker manual is intended to be accurate
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documentation for features which gold supports.  gold supports most of
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the features of the GNU linker for ELF targets.  Notable
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omissions--features of the GNU linker not currently supported in
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gold--are:
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  * MRI compatible linker scripts
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  * cross-reference reports (--cref)
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  * various other minor options
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Notes on the code
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=================
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These are some notes which may be helpful to people working on the
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source code of gold itself.
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gold is written in C++.  It is a GNU program, and therefore follows
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the GNU formatting standards as modified for C++.  Source documents in
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order of decreasing precedence:
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    http://www.gnu.org/prep/standards/
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    http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/C++STYLE
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    http://www.zembu.com/eng/procs/c++style.html
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The linker is intended to have complete support for cross-compilation,
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while still supporting the normal case of native linking as fast as
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possible.  In order to do this, many classes are actually templates
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whose parameter is the ELF file class (e.g., 32 bits or 64 bits).  The
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C++ code is the same, but we don't pay the execution time cost of
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always using 64-bit integers if the target is 32 bits.  Many of these
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class templates also have an endianness parameter: true for
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big-endian, false for little-endian.
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The linker is multi-threaded.  The Task class represents a single unit
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of work.  Task objects are stored on a single Workqueue object.  Tasks
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communicate via Task_token objects.  Task_token objects are only
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manipulated while holding the master Workqueue lock.  Relatively few
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mutexes are used.
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Build requirements
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==================
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The gold source code uses templates heavily.  Building it requires a
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recent version of g++.  g++ 4.0.3 and 4.1.3 are known to work.  g++
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3.2, 3.4.3, and 4.1.2 are known to fail.
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The linker script parser uses features which are only in newer
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versions of bison.  bison 2.3 is known to work.  bison 1.26 is known
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to fail.  If you are building gold from an official binutils release,
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the bison output should already be included.

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