binutils-gdb/gold
Alan Modra 5fe7ffdc98 Fix "overflow in PLT unwind data" warning
When linking statically, it's possible to hit this warning with IFUNC
or very large executables, due to .glink being unused.

	* powerpc.cc (do_plt_fde_location): Handle zero length .glink.
	Compare FDE contents with DW_CFA_nop rather than 0.
2014-05-15 18:37:43 +09:30
..
po Update copyright years 2014-03-05 22:16:15 +10:30
testsuite With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
ChangeLog Fix "overflow in PLT unwind data" warning 2014-05-15 18:37:43 +09:30
Makefile.am Update copyright years 2014-03-05 22:16:15 +10:30
Makefile.in autoreconf 2014-03-12 15:02:00 +10:30
NEWS Update copyright years 2014-03-05 22:16:15 +10:30
README Update copyright years 2014-03-05 22:16:15 +10:30
TODO * TODO: New file. 2008-04-03 00:33:37 +00:00
aclocal.m4 * configure.ac (HAVE_ZLIB): Use AM_ZLIB instead of AC_SEARCH_LIBS. 2012-12-07 04:28:52 +00:00
archive.cc Update copyright years 2014-03-05 22:16:15 +10:30
archive.h Update copyright years 2014-03-05 22:16:15 +10:30
arm-reloc-property.cc Update copyright years 2014-03-05 22:16:15 +10:30
arm-reloc-property.h Update copyright years 2014-03-05 22:16:15 +10:30
arm-reloc.def Update copyright years 2014-03-05 22:16:15 +10:30
arm.cc With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
attributes.cc Update copyright years 2014-03-05 22:16:15 +10:30
attributes.h Update copyright years 2014-03-05 22:16:15 +10:30
binary.cc Update copyright years 2014-03-05 22:16:15 +10:30
binary.h Update copyright years 2014-03-05 22:16:15 +10:30
common.cc Update copyright years 2014-03-05 22:16:15 +10:30
common.h Update copyright years 2014-03-05 22:16:15 +10:30
compressed_output.cc Update copyright years 2014-03-05 22:16:15 +10:30
compressed_output.h Update copyright years 2014-03-05 22:16:15 +10:30
config.in Add configure checks for <unordered_set> and <unordered_map>. 2013-12-18 15:53:31 -08:00
configure Modify gold testsuite to disable plugins added by GCC driver. 2014-04-02 15:04:36 -07:00
configure.ac Modify gold testsuite to disable plugins added by GCC driver. 2014-04-02 15:04:36 -07:00
configure.tgt Update copyright years 2014-03-05 22:16:15 +10:30
copy-relocs.cc Allow target to derive from Copy_relocs class. 2014-04-15 11:56:18 -07:00
copy-relocs.h Allow target to derive from Copy_relocs class. 2014-04-15 11:56:18 -07:00
cref.cc Update copyright years 2014-03-05 22:16:15 +10:30
cref.h Update copyright years 2014-03-05 22:16:15 +10:30
debug.h Update copyright years 2014-03-05 22:16:15 +10:30
defstd.cc Fix handling of __ehdr_start when it cannot be defined. 2014-05-02 16:33:43 -07:00
defstd.h Update copyright years 2014-03-05 22:16:15 +10:30
descriptors.cc Update copyright years 2014-03-05 22:16:15 +10:30
descriptors.h Update copyright years 2014-03-05 22:16:15 +10:30
dirsearch.cc Update copyright years 2014-03-05 22:16:15 +10:30
dirsearch.h Update copyright years 2014-03-05 22:16:15 +10:30
dwarf_reader.cc Update copyright years 2014-03-05 22:16:15 +10:30
dwarf_reader.h Update copyright years 2014-03-05 22:16:15 +10:30
dwp.cc Update copyright years 2014-03-05 22:16:15 +10:30
dwp.h Update copyright years 2014-03-05 22:16:15 +10:30
dynobj.cc Update copyright years 2014-03-05 22:16:15 +10:30
dynobj.h Update copyright years 2014-03-05 22:16:15 +10:30
ehframe.cc Update copyright years 2014-03-05 22:16:15 +10:30
ehframe.h Update copyright years 2014-03-05 22:16:15 +10:30
errors.cc Update copyright years 2014-03-05 22:16:15 +10:30
errors.h Update copyright years 2014-03-05 22:16:15 +10:30
expression.cc Update copyright years 2014-03-05 22:16:15 +10:30
ffsll.c Update copyright years 2014-03-05 22:16:15 +10:30
fileread.cc Update copyright years 2014-03-05 22:16:15 +10:30
fileread.h Update copyright years 2014-03-05 22:16:15 +10:30
freebsd.h Update copyright years 2014-03-05 22:16:15 +10:30
ftruncate.c Update copyright years 2014-03-05 22:16:15 +10:30
gc.cc Update copyright years 2014-03-05 22:16:15 +10:30
gc.h Update copyright years 2014-03-05 22:16:15 +10:30
gdb-index.cc Don't complain about the source language when we have pubnames/pubtypes info. 2014-05-05 15:23:14 -07:00
gdb-index.h Update copyright years 2014-03-05 22:16:15 +10:30
gold-threads.cc Update copyright years 2014-03-05 22:16:15 +10:30
gold-threads.h Update copyright years 2014-03-05 22:16:15 +10:30
gold.cc Update copyright years 2014-03-05 22:16:15 +10:30
gold.h Update copyright years 2014-03-05 22:16:15 +10:30
i386.cc With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
icf.cc 2014-04-02 Sriraman Tallam <tmsriram@google.com> 2014-04-02 17:07:47 -07:00
icf.h Update copyright years 2014-03-05 22:16:15 +10:30
incremental-dump.cc Update copyright years 2014-03-05 22:16:15 +10:30
incremental.cc Update copyright years 2014-03-05 22:16:15 +10:30
incremental.h Update copyright years 2014-03-05 22:16:15 +10:30
int_encoding.cc Update copyright years 2014-03-05 22:16:15 +10:30
int_encoding.h Update copyright years 2014-03-05 22:16:15 +10:30
layout.cc Fix handling of __ehdr_start when it cannot be defined. 2014-05-02 16:33:43 -07:00
layout.h Update copyright years 2014-03-05 22:16:15 +10:30
main.cc Update copyright years 2014-03-05 22:16:15 +10:30
mapfile.cc Update copyright years 2014-03-05 22:16:15 +10:30
mapfile.h Update copyright years 2014-03-05 22:16:15 +10:30
merge.cc Update copyright years 2014-03-05 22:16:15 +10:30
merge.h Update copyright years 2014-03-05 22:16:15 +10:30
mremap.c Update copyright years 2014-03-05 22:16:15 +10:30
nacl.cc Update copyright years 2014-03-05 22:16:15 +10:30
nacl.h Update copyright years 2014-03-05 22:16:15 +10:30
object.cc 2014-05-08 Martin Liška <mliska@suse.cz> 2014-05-08 15:23:53 -07:00
object.h Update copyright years 2014-03-05 22:16:15 +10:30
options.cc Update copyright years 2014-03-05 22:16:15 +10:30
options.h Update copyright years 2014-03-05 22:16:15 +10:30
output.cc Allow target to add custom dynamic table entries. 2014-03-10 13:34:53 -07:00
output.h Allow target to add custom dynamic table entries. 2014-03-10 13:34:53 -07:00
parameters.cc Update copyright years 2014-03-05 22:16:15 +10:30
parameters.h Update copyright years 2014-03-05 22:16:15 +10:30
plugin.cc Update copyright years 2014-03-05 22:16:15 +10:30
plugin.h Update copyright years 2014-03-05 22:16:15 +10:30
powerpc.cc Fix "overflow in PLT unwind data" warning 2014-05-15 18:37:43 +09:30
pread.c Update copyright years 2014-03-05 22:16:15 +10:30
readsyms.cc Update copyright years 2014-03-05 22:16:15 +10:30
readsyms.h Update copyright years 2014-03-05 22:16:15 +10:30
reduced_debug_output.cc Update copyright years 2014-03-05 22:16:15 +10:30
reduced_debug_output.h Update copyright years 2014-03-05 22:16:15 +10:30
reloc-types.h Update copyright years 2014-03-05 22:16:15 +10:30
reloc.cc Update copyright years 2014-03-05 22:16:15 +10:30
reloc.h Update copyright years 2014-03-05 22:16:15 +10:30
resolve.cc Fix handling of __ehdr_start when it cannot be defined. 2014-05-02 16:33:43 -07:00
script-c.h Update copyright years 2014-03-05 22:16:15 +10:30
script-sections.cc Update copyright years 2014-03-05 22:16:15 +10:30
script-sections.h Update copyright years 2014-03-05 22:16:15 +10:30
script.cc Update copyright years 2014-03-05 22:16:15 +10:30
script.h Update copyright years 2014-03-05 22:16:15 +10:30
sparc.cc With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
stringpool.cc Update copyright years 2014-03-05 22:16:15 +10:30
stringpool.h Update copyright years 2014-03-05 22:16:15 +10:30
symtab.cc Fix handling of __ehdr_start when it cannot be defined. 2014-05-02 16:33:43 -07:00
symtab.h With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
system.h Update copyright years 2014-03-05 22:16:15 +10:30
target-reloc.h Fix handling of __ehdr_start when it cannot be defined. 2014-05-02 16:33:43 -07:00
target-select.cc Update copyright years 2014-03-05 22:16:15 +10:30
target-select.h Update copyright years 2014-03-05 22:16:15 +10:30
target.cc Update copyright years 2014-03-05 22:16:15 +10:30
target.h Allow target to decide whether to include a section. 2014-04-15 11:56:18 -07:00
tilegx.cc With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
timer.cc Update copyright years 2014-03-05 22:16:15 +10:30
timer.h Update copyright years 2014-03-05 22:16:15 +10:30
tls.h Update copyright years 2014-03-05 22:16:15 +10:30
token.h Update copyright years 2014-03-05 22:16:15 +10:30
version.cc Update copyright years 2014-03-05 22:16:15 +10:30
workqueue-internal.h Update copyright years 2014-03-05 22:16:15 +10:30
workqueue-threads.cc Update copyright years 2014-03-05 22:16:15 +10:30
workqueue.cc Update copyright years 2014-03-05 22:16:15 +10:30
workqueue.h Update copyright years 2014-03-05 22:16:15 +10:30
x86_64.cc With -pie and x86, the linker complains if it sees a PC-relative relocation 2014-05-13 10:55:11 -07:00
yyscript.y Update copyright years 2014-03-05 22:16:15 +10:30

README

This file contains invisible Unicode characters

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gold is an ELF linker.  It is intended to have complete support for
ELF and to run as fast as possible on modern systems.  For normal use
it is a drop-in replacement for the older GNU linker.

gold is part of the GNU binutils.  See ../binutils/README for more
general notes, including where to send bug reports.

gold was originally developed at Google, and was contributed to the
Free Software Foundation in March 2008.  At Google it was designed by
Ian Lance Taylor, with major contributions by Cary Coutant, Craig
Silverstein, and Andrew Chatham.

The existing GNU linker manual is intended to be accurate
documentation for features which gold supports.  gold supports most of
the features of the GNU linker for ELF targets.  Notable
omissions--features of the GNU linker not currently supported in
gold--are:
  * MRI compatible linker scripts
  * cross-reference reports (--cref)
  * various other minor options


Notes on the code
=================

These are some notes which may be helpful to people working on the
source code of gold itself.

gold is written in C++.  It is a GNU program, and therefore follows
the GNU formatting standards as modified for C++.  Source documents in
order of decreasing precedence:
    http://www.gnu.org/prep/standards/
    http://gcc.gnu.org/onlinedocs/libstdc++/manual/source_code_style.html
    http://www.zembu.com/eng/procs/c++style.html

The linker is intended to have complete support for cross-compilation,
while still supporting the normal case of native linking as fast as
possible.  In order to do this, many classes are actually templates
whose parameter is the ELF file class (e.g., 32 bits or 64 bits).  The
C++ code is the same, but we don't pay the execution time cost of
always using 64-bit integers if the target is 32 bits.  Many of these
class templates also have an endianness parameter: true for
big-endian, false for little-endian.

The linker is multi-threaded.  The Task class represents a single unit
of work.  Task objects are stored on a single Workqueue object.  Tasks
communicate via Task_token objects.  Task_token objects are only
manipulated while holding the master Workqueue lock.  Relatively few
mutexes are used.


Build requirements
==================

The gold source code uses templates heavily.  Building it requires a
recent version of g++.  g++ 4.0.3 and 4.1.3 are known to work.  g++
3.2, 3.4.3, and 4.1.2 are known to fail.

The linker script parser uses features which are only in newer
versions of bison.  bison 2.3 is known to work.  bison 1.26 is known
to fail.  If you are building gold from an official binutils release,
the bison output should already be included.


Copyright (C) 2012-2014 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.