binutils-gdb/ld
H.J. Lu cd04836359 x86: Remove the unused _GLOBAL_OFFSET_TABLE_
Since _GLOBAL_OFFSET_TABLE_ may be referenced implicitly on x86,
checking ref_regular_nonweak leaves the unused _GLOBAL_OFFSET_TABLE_
in output.  This patch checks explicit GOT references instead.

ld-i386/discarded1.s and ld-x86-64/discarded1.s are updated to avoid
linker optimization which removes GOT references.

bfd/

	PR ld/22782
	* elf32-i386.c (elf_i386_check_relocs): Set got_referenced if
	_GLOBAL_OFFSET_TABLE_ is referenced or GOT is needed to resolve
	undefined weak symbol to 0.
	* elf64-x86-64.c (elf_x86_64_check_relocs): Set got_referenced
	if _GLOBAL_OFFSET_TABLE_ is referenced.
	* elfxx-x86.c (_bfd_x86_elf_size_dynamic_sections): Check
	got_referenced instead of ref_regular_nonweak.  Remove the
	unused _GLOBAL_OFFSET_TABLE_ from symbol table.
	* elfxx-x86.h (elf_x86_link_hash_table): Add got_referenced.

ld/

	PR ld/22782
	* testsuite/ld-i386/discarded1.s: Replace mov with div.
	* testsuite/ld-x86-64/discarded1.s: Likewise.
	* testsuite/ld-i386/i386.exp: Run pr22782.
	* testsuite/ld-i386/load1-nacl.d: Updated for removing
	_GLOBAL_OFFSET_TABLE_ from output.
	* testsuite/ld-i386/load1.d: Likewise.
	* testsuite/ld-x86-64/load1a-nacl.d: Likewise.
	* testsuite/ld-x86-64/load1a.d: Likewise.
	* testsuite/ld-x86-64/load1b-nacl.d: Likewise.
	* testsuite/ld-x86-64/load1b.d: Likewise.
	* testsuite/ld-i386/pr22782.d: New file.
	* testsuite/ld-i386/pr22782.s: Likewise.
	* testsuite/ld-x86-64/pr22782.s: Likewise.
	* testsuite/ld-x86-64/pr22782a.d: Likewise.
	* testsuite/ld-x86-64/pr22782b.d: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Run pr22782a and pr22782b.
2018-02-05 08:38:16 -08:00
..
emulparams Disable -shared support in nios2-elf-ld. 2018-02-02 23:00:02 -08:00
emultempl solaris2.em: Fold after_allocation into before_allocation 2018-01-18 16:22:13 -08:00
po Updated Brazillian portuguese and Russian translation 2018-02-05 13:09:15 +00:00
scripttempl Remove PROVIDE() qualifiers from definition of __CTOR_LIST__ and __DTOR_LIST__ symbols in PE linker scripts. 2018-02-03 13:11:35 +00:00
testsuite x86: Remove the unused _GLOBAL_OFFSET_TABLE_ 2018-02-05 08:38:16 -08:00
.gitignore
aclocal.m4
ChangeLog x86: Remove the unused _GLOBAL_OFFSET_TABLE_ 2018-02-05 08:38:16 -08:00
ChangeLog-0001
ChangeLog-0203
ChangeLog-2004
ChangeLog-2005
ChangeLog-2006
ChangeLog-2007
ChangeLog-2008
ChangeLog-2009
ChangeLog-2010
ChangeLog-2011
ChangeLog-2012
ChangeLog-2013
ChangeLog-2014
ChangeLog-2015
ChangeLog-2016
ChangeLog-2017 ChangeLog rotation 2018-01-03 17:49:42 +10:30
ChangeLog-9197
ChangeLog-9899
config.in Add configure flag to enable gnu hash style by default. 2017-08-08 07:25:39 +09:30
configure Bump version number to 2.30.51 2018-01-13 13:31:12 +00:00
configure.ac Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
configure.host Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
configure.tgt Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
deffile.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
deffilep.y Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
dep-in.sed
elf-hints-local.h
fdl.texi
gen-doc.texi Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
genscrba.sh
genscripts.sh ld: Add "-z separate-code" option to ELF linker 2018-01-11 19:01:52 -08:00
h8-doc.texi Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ld.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ld.texinfo Remove PROVIDE() qualifiers from definition of __CTOR_LIST__ and __DTOR_LIST__ symbols in PE linker scripts. 2018-02-03 13:11:35 +00:00
ldbuildid.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldbuildid.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldcref.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldctor.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldctor.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldemul.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldemul.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldexp.c Fix compile time warnings building the binutils with clang. 2018-02-01 13:21:41 +00:00
ldexp.h ld: Remove unused expression state 2018-01-11 17:35:35 +00:00
ldfile.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldfile.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldgram.y Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldint.texinfo Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldlang.c PR22751, LTO broken for libgcc libcalls 2018-01-28 08:29:55 +10:30
ldlang.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldlex-wrapper.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldlex.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldlex.l Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldmain.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldmain.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldmisc.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldmisc.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldver.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldver.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldwrite.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
ldwrite.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
lexsup.c ld: Add "-z separate-code" option to ELF linker 2018-01-11 19:01:52 -08:00
MAINTAINERS Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
Makefile.am Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
Makefile.in Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
mri.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
mri.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
NEWS Add 2.30 markers to NEWS files. 2018-01-13 13:20:55 +00:00
pe-dll.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
pe-dll.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
pep-dll.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
pep-dll.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
plugin.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
plugin.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
README Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
stamp-h.in
sysdep.h Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
testplug2.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
testplug3.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
testplug4.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
testplug.c Update year range in copyright notice of binutils files 2018-01-03 17:49:56 +10:30
TODO

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		README for LD

This is the GNU linker.  It is distributed with other "binary
utilities" which should be in ../binutils.  See ../binutils/README for
more general notes, including where to send bug reports.

There are many features of the linker:

* The linker uses a Binary File Descriptor library (../bfd)
  that it uses to read and write object files.  This helps
  insulate the linker itself from the format of object files.

* The linker supports a number of different object file
  formats.  It can even handle multiple formats at once:
  Read two input formats and write a third.

* The linker can be configured for cross-linking.

* The linker supports a control language.

* There is a user manual (ld.texinfo), as well as the
  beginnings of an internals manual (ldint.texinfo).

Installation
============

See ../binutils/README.

If you want to make a cross-linker, you may want to specify
a different search path of -lfoo libraries than the default.
You can do this by setting the LIB_PATH variable in ./Makefile
or using the --with-lib-path configure switch.

To build just the linker, make the target all-ld from the top level
directory (one directory above this one).

Porting to a new target
=======================

See the ldint.texinfo manual.

Reporting bugs etc
===========================

See ../binutils/README.

Known problems
==============

The Solaris linker normally exports all dynamic symbols from an
executable.  The GNU linker does not do this by default.  This is
because the GNU linker tries to present the same interface for all
similar targets (in this case, all native ELF targets).  This does not
matter for normal programs, but it can make a difference for programs
which try to dlopen an executable, such as PERL or Tcl.  You can make
the GNU linker export all dynamic symbols with the -E or
--export-dynamic command line option.

HP/UX 9.01 has a shell bug that causes the linker scripts to be
generated incorrectly.  The symptom of this appears to be "fatal error
- scanner input buffer overflow" error messages.  There are various
workarounds to this:
  * Build and install bash, and build with "make SHELL=bash".
  * Update to a version of HP/UX with a working shell (e.g., 9.05).
  * Replace "(. ${srcdir}/scripttempl/${SCRIPT_NAME}.sc)" in
    genscripts.sh with "sh ${srcdir}..." (no parens) and make sure the
    emulparams script used exports any shell variables it sets.

Copyright (C) 2012-2018 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.