binutils-gdb/gold
Joshua Oreman e173ea00c2 Fix problem with ICF where diffs in EH frame info is ignored.
PR gold/21066
	* gc.h (gc_process_relocs): Track relocations in .eh_frame sections
	when ICF is enabled, even though the .eh_frame sections themselves
	are not foldable.
	* icf.cc (get_section_contents): Change arguments to permit operation
	on just part of a section. Include extra identity regions in the
	referring section's contents recursively.
	(match_sections): Lock object here instead of in get_section_contents
	so that get_section_contents can operate recursively.
	(Icf::add_ehframe_links): New method.
	(Icf::find_identical_sections): Pass .eh_frame sections to
	add_ehframe_links(). Increase default iteration count from 2 to 3
	because handling exception info typically requires one extra iteration.
	* icf.h (Icf::extra_identity_list_): New data member with accessor.
	(is_section_foldable_candidate): Include .gcc_except_table sections.
	* options.h: Update documentation for new default ICF iteration count.
	* testsuite/Makefile.am (icf_test_pr21066): New test case.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/icf_test_pr21066.cc: New source file.
	* testsuite/icf_test_pr21066.sh: New test script.
2019-05-11 07:27:10 +08:00
..
po Updated French translation for ld/ and gold/ subdirectories 2019-02-12 13:22:42 +00:00
testsuite Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
ChangeLog Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
ChangeLog-0815 binutils ChangeLog rotation 2016-01-01 22:59:17 +10:30
ChangeLog-2016 ChangeLog rotation 2017-01-02 13:55:05 +10:30
ChangeLog-2017 ChangeLog rotation 2018-01-03 17:49:42 +10:30
ChangeLog-2018 ChangeLog rotation 2019-01-01 21:25:40 +10:30
Makefile.am Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
Makefile.in Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
NEWS Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
README Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
TODO
aarch64-reloc-property.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
aarch64-reloc-property.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
aarch64-reloc.def Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
aarch64.cc Check whether symbols with MOVW_.ABS relocations require PLT entries (aarch64). 2019-02-19 16:13:24 -08:00
aclocal.m4 Replace thread config with automatic config using ax_pthread.m4. 2018-06-19 18:57:28 -07:00
archive.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
archive.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
arm-reloc-property.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
arm-reloc-property.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
arm-reloc.def Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
arm.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
attributes.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
attributes.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
binary.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
binary.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
common.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
common.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
compressed_output.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
compressed_output.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
config.in Restore build on x86_64-w64-mingw32. 2018-12-03 23:50:48 -08:00
configure Adjust bfd/warning.m4 egrep patterns 2019-01-09 13:51:08 +10:30
configure.ac Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
configure.tgt Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
copy-relocs.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
copy-relocs.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
cref.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
cref.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
debug.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
defstd.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
defstd.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
descriptors.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
descriptors.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dirsearch.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dirsearch.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dwarf_reader.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dwarf_reader.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dwp.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dwp.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dynobj.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
dynobj.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ehframe.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ehframe.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
errors.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
errors.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
expression.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ffsll.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
fileread.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
fileread.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
freebsd.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
ftruncate.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gc.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gc.h Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
gdb-index.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gdb-index.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gold-threads.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gold-threads.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gold.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
gold.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
i386.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
icf.cc Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
icf.h Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
incremental-dump.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
incremental.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
incremental.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
int_encoding.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
int_encoding.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
layout.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
layout.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
main.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mapfile.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mapfile.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
merge.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
merge.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mips.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
mremap.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
nacl.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
nacl.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
object.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
object.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
options.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
options.h Fix problem with ICF where diffs in EH frame info is ignored. 2019-05-11 07:27:10 +08:00
output.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
output.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
parameters.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
parameters.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
plugin.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
plugin.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
powerpc.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
pread.c Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
readsyms.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
readsyms.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
reduced_debug_output.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
reduced_debug_output.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
reloc-types.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
reloc.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
reloc.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
resolve.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
s390.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
script-c.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
script-sections.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
script-sections.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
script.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
script.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
sparc.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
stringpool.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
stringpool.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
symtab.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
symtab.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
system.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
target-reloc.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
target-select.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
target-select.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
target.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
target.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
tilegx.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
timer.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
timer.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
tls.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
token.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
version.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
workqueue-internal.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
workqueue-threads.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
workqueue.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
workqueue.h Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
x86_64.cc Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30
yyscript.y Update year range in copyright notice of binutils files 2019-01-01 22:06:53 +10:30

README

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

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) 2012-2019 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.