binutils-gdb/gold
Doug Kwan c5617f2fb6 2009-10-16 Doug Kwan <dougkwan@google.com>
* dynobj.cc (Versions::Versions): Initialize version_script_.
	Only insert base version symbol definition for a shared object
	if version script defines any version versions.
	(Versions::define_base_version): New method definition.
	(Versions::add_def): Check that base version is not needed.
	(Versions::add_need): Define base version lazily.
	* dynobj.h (Versions::define_base_version): New method declaration.
	(Versions::needs_base_version_): New data member declaration.
	* testsuite/Makefile.am (check_SCRIPTS): Add no_version_test.sh
	(check_DATA): Add no_version_test.stdout.
	(libno_version_test.so, no_version_test.o no_version_test.stdout):
	New make rules.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/no_version_test.c: New file.
	* testsuite/no_version_test.sh: Ditto.
2009-10-16 19:11:32 +00:00
..
po Updated Spanish and Vietnamese translations 2009-09-18 07:54:47 +00:00
testsuite 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 19:11:32 +00:00
ChangeLog 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 19:11:32 +00:00
Makefile.am Fix yacc and lex reruns with maintainer-mode off. 2009-08-24 05:55:55 +00:00
Makefile.in Fix yacc and lex reruns with maintainer-mode off. 2009-08-24 05:55:55 +00:00
NEWS * NEWS: New file. 2008-03-25 21:55:29 +00:00
README Add support for -pie. 2009-10-14 05:25:02 +00:00
TODO * TODO: New file. 2008-04-03 00:33:37 +00:00
aclocal.m4 Regenerate tree using Autoconf 2.64 and Automake 1.11. 2009-08-22 16:56:56 +00:00
archive.cc 2009-10-10 Chris Demetriou <cgd@google.com> 2009-10-10 07:39:04 +00:00
archive.h 2009-05-19 Doug Kwan <dougkwan@google.com> 2009-05-19 22:14:17 +00:00
arm.cc * symtab.h: Check for GOLD_SYMTAB_H before header includes. Remove 2009-10-13 00:39:31 +00:00
binary.cc * binary.cc: Fix file comment. 2009-02-07 01:03:32 +00:00
binary.h Add support for --format binary for input files. 2008-02-08 07:06:58 +00:00
common.cc * layout.cc (Layout::make_output_section): Call 2009-06-22 06:51:53 +00:00
common.h * mapfile.cc: New file. 2008-05-21 21:37:44 +00:00
compressed_output.cc * compressed_output.h (class Output_compressed_section): Use 2008-04-03 14:18:37 +00:00
compressed_output.h * compressed_output.h (class Output_compressed_section): Use 2008-04-03 14:18:37 +00:00
config.in * configure.ac: Check for readv function also. 2009-10-09 23:20:44 +00:00
configure * configure.ac: Check for readv function also. 2009-10-09 23:20:44 +00:00
configure.ac * configure.ac: Check for readv function also. 2009-10-09 23:20:44 +00:00
configure.tgt 2009-05-28 Doug Kwan <dougkwan@google.com> 2009-05-29 00:15:12 +00:00
copy-relocs.cc 2009-09-30 Doug Kwan <dougkwan@google.com> 2009-10-01 00:58:38 +00:00
copy-relocs.h Handle output sections with more than 0x7fffffff bytes. 2008-07-10 23:01:20 +00:00
cref.cc * cref.cc: New file. 2008-07-22 22:08:43 +00:00
cref.h * cref.cc: New file. 2008-07-22 22:08:43 +00:00
debug.h 2009-09-17 Doug Kwan <dougkwan@google.com> 2009-09-18 01:10:38 +00:00
defstd.cc Fully implement the SECTIONS clause. 2008-02-04 05:43:05 +00:00
defstd.h Update copyright years. Update language files. 2008-03-13 21:04:21 +00:00
descriptors.cc * descriptor.cc: Include <cstdio> and "binary-io.h". 2009-10-10 04:56:43 +00:00
descriptors.h 2009-03-23 Ian Lance Taylor <iant@google.com> 2009-03-24 04:50:32 +00:00
dirsearch.cc * readsyms.cc (Read_symbols::incompatible_warning): New function. 2009-03-14 05:56:46 +00:00
dirsearch.h * readsyms.cc (Read_symbols::incompatible_warning): New function. 2009-03-14 05:56:46 +00:00
dwarf_reader.cc * dwarf_reader.cc (Sized_dwarf_line_info::Sized_dwarf_line_info): 2009-10-09 23:05:21 +00:00
dwarf_reader.h * dwarf_reader.cc (Sized_dwarf_line_info::Sized_dwarf_line_info): 2009-10-09 23:05:21 +00:00
dynobj.cc 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 19:11:32 +00:00
dynobj.h 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 19:11:32 +00:00
ehframe.cc PR 6048 2008-07-24 21:23:09 +00:00
ehframe.h * mapfile.cc: New file. 2008-05-21 21:37:44 +00:00
errors.cc 2009-03-23 Ian Lance Taylor <iant@google.com> 2009-03-24 04:50:32 +00:00
errors.h 2009-03-23 Ian Lance Taylor <iant@google.com> 2009-03-24 04:50:32 +00:00
expression.cc 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00
ffsll.c * ffsll.c (ffsll): Correct implementation. 2009-03-30 23:17:11 +00:00
fileread.cc 2009-10-10 Chris Demetriou <cgd@google.com> 2009-10-10 07:39:04 +00:00
fileread.h * configure.ac: Check for readv function also. 2009-10-09 23:20:44 +00:00
freebsd.h * freebsd.h (Target_freebsd::do_adjust_elf_header): Use size 2009-07-01 16:21:36 +00:00
ftruncate.c * ffsll.c: New file. 2009-03-28 05:22:30 +00:00
gc.cc 2009-01-20 Sriraman Tallam <tmsriram@google.com> 2009-01-28 02:25:33 +00:00
gc.h * gc.h (gc_process_relocs): Check if icf is enabled using new 2009-10-13 21:17:43 +00:00
gold-threads.cc * target-select.cc (instantiate_target): Don't acquire the lock if 2009-03-24 17:32:43 +00:00
gold-threads.h 2009-03-23 Ian Lance Taylor <iant@google.com> 2009-03-24 04:50:32 +00:00
gold.cc Add support for -pie. 2009-10-14 05:25:02 +00:00
gold.h * gold.h (FUNCTION_NAME): Define. 2009-08-14 09:35:38 +00:00
i386.cc * object.h (class Relocate_info): Add reloc_shdr and data_shdr 2009-10-15 00:33:18 +00:00
icf.cc * gc.h (gc_process_relocs): Check if icf is enabled using new 2009-10-13 21:17:43 +00:00
icf.h Sriraman Tallam <tmsriram@google.com> 2009-08-12 19:03:16 +00:00
incremental.cc elfcpp/: 2009-10-09 22:38:07 +00:00
incremental.h elfcpp/: 2009-10-09 22:38:07 +00:00
layout.cc * layout.cc (Layout::relaxation_loop_body): Don't crash if we see 2009-10-16 05:16:09 +00:00
layout.h 2009-10-09 Doug Kwan <dougkwan@google.com> 2009-10-09 23:18:19 +00:00
main.cc * gc.h (gc_process_relocs): Check if icf is enabled using new 2009-10-13 21:17:43 +00:00
mapfile.cc * mapfile.cc (Mapfile::print_input_section): Change -1U to -1ULL. 2008-09-29 21:10:26 +00:00
mapfile.h 2008-08-06 Cary Coutant <ccoutant@google.com> 2008-08-07 17:02:11 +00:00
merge.cc * merge.cc (Object_merge_map::initialize_input_to_output_map): 2009-07-09 23:29:55 +00:00
merge.h 2009-10-09 Doug Kwan <dougkwan@google.com> 2009-10-09 23:18:19 +00:00
mremap.c * ffsll.c: New file. 2009-03-28 05:22:30 +00:00
object.cc * gc.h (gc_process_relocs): Check if icf is enabled using new 2009-10-13 21:17:43 +00:00
object.h * object.h (class Relocate_info): Add reloc_shdr and data_shdr 2009-10-15 00:33:18 +00:00
options.cc Add support for -pie. 2009-10-14 05:25:02 +00:00
options.h Add support for -pie. 2009-10-14 05:25:02 +00:00
output.cc 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:34:53 +00:00
output.h 2009-10-09 Doug Kwan <dougkwan@google.com> 2009-10-09 23:18:19 +00:00
parameters.cc * object.h (class Object): Remove target_ field, and target, 2009-09-30 22:21:13 +00:00
parameters.h * object.h (class Object): Remove target_ field, and target, 2009-09-30 22:21:13 +00:00
plugin.cc * plugin.cc: Include "gold.h" before other header files. 2009-10-12 06:02:06 +00:00
plugin.h * plugin.cc (add_input_library): New. 2009-10-06 20:15:09 +00:00
powerpc.cc * symtab.h: Check for GOLD_SYMTAB_H before header includes. Remove 2009-10-13 00:39:31 +00:00
pread.c * pread.c: Include stdio.h. 2009-10-09 23:10:15 +00:00
readsyms.cc 2009-10-10 Chris Demetriou <cgd@google.com> 2009-10-10 07:39:04 +00:00
readsyms.h * readsyms.cc (Read_symbols::incompatible_warning): New function. 2009-03-14 05:56:46 +00:00
reduced_debug_output.cc * gold.h: Include <cstring> and <stdint.h>. 2009-01-28 20:09:18 +00:00
reduced_debug_output.h PR 9812 2009-02-04 15:18:51 +00:00
reloc-types.h * copy-relocs.cc: New file. 2008-04-16 22:54:29 +00:00
reloc.cc * object.h (class Relocate_info): Add reloc_shdr and data_shdr 2009-10-15 00:33:18 +00:00
reloc.h 2009-06-23 Doug Kwan <dougkwan@google.com> 2009-06-23 18:10:42 +00:00
resolve.cc * object.h (class Object): Remove target_ field, and target, 2009-09-30 22:21:13 +00:00
script-c.h 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00
script-sections.cc 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00
script-sections.h 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00
script.cc 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00
script.h * fileread.cc (File_read::get_mtime): New method. 2009-07-06 23:11:21 +00:00
sparc.cc * symtab.h: Check for GOLD_SYMTAB_H before header includes. Remove 2009-10-13 00:39:31 +00:00
stringpool.cc PR 10133 2009-06-23 07:04:10 +00:00
stringpool.h PR 10133 2009-06-23 07:04:10 +00:00
symtab.cc Add support for -pie. 2009-10-14 05:25:02 +00:00
symtab.h Add support for -pie. 2009-10-14 05:25:02 +00:00
target-reloc.h * options.h (class General_options): Define 2009-10-06 22:58:27 +00:00
target-select.cc * target-select.cc (instantiate_target): Don't acquire the lock if 2009-03-24 17:32:43 +00:00
target-select.h 2009-03-23 Ian Lance Taylor <iant@google.com> 2009-03-24 04:50:32 +00:00
target.cc 2009-10-09 Doug Kwan <dougkwan@google.com> 2009-10-09 23:18:19 +00:00
target.h 2009-10-09 Doug Kwan <dougkwan@google.com> 2009-10-09 23:18:19 +00:00
tls.h Update copyright years. Update language files. 2008-03-13 21:04:21 +00:00
token.h Update copyright years. Update language files. 2008-03-13 21:04:21 +00:00
version.cc * version.cc (version_string): Bump to 1.8. 2009-01-28 20:18:11 +00:00
workqueue-internal.h Update copyright years. Update language files. 2008-03-13 21:04:21 +00:00
workqueue-threads.cc Update copyright years. Update language files. 2008-03-13 21:04:21 +00:00
workqueue.cc * readsyms.cc (Read_symbols::incompatible_warning): New function. 2009-03-14 05:56:46 +00:00
workqueue.h * readsyms.cc (Read_symbols::incompatible_warning): New function. 2009-03-14 05:56:46 +00:00
x86_64.cc * symtab.h: Check for GOLD_SYMTAB_H before header includes. Remove 2009-10-13 00:39:31 +00:00
yyscript.y 2009-10-16 Doug Kwan <dougkwan@google.com> 2009-10-16 18:56:07 +00:00

README

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:
  * MEMORY regions in linker scripts
  * 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++/17_intro/C++STYLE
    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 is known to work.  g++ 3.2 and g++
3.4.3 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.