binutils-gdb/ld
Alan Modra db4677b8bd PR21167, relocation sections not included in groups
This fixes a wart I've known about for years, but haven't done
anything about because BFD treats relocation sections as an adjunct to
the section they relocate.  SHF_GROUP on the section thus implicitly
applies to its relocation section(s), but it is an error that the
reloc sections aren't part of the group.

Like many patches to gas, this wasn't as straightforward as it could
be due to a number of backends, i386, cr16 and others, removing relocs
in tc_get_reloc rather than marking them as "done" earlier in
md_apply_reloc.  So it isn't possible for the group support to
reliably detect the presence of relocs by looking at fixups earlier
than write_relocs.  However the group support needs to create
signature symbols, and that must be done before the symbol table is
frozen, before write_relocs.  So split off the group sizing from
elf_adjust_symtab and put it in elf_frob_file_after_relocs.

bfd/
	PR 21167
	* elf.c (_bfd_elf_setup_sections): Don't trim reloc sections from
	groups.
	(_bfd_elf_init_reloc_shdr): Pass sec_hdr, use it to copy SHF_GROUP
	flag from section.
	(elf_fake_sections): Adjust calls.  Exit immediately on failure.
	(bfd_elf_set_group_contents): Add associated reloc section indices
	to group contents
gas/
	PR 21167
	* config/obj-elf.c (struct group_list): Delete elt_count.
	(groups): New static.
	(build_group_lists): Don't count elements.
	(elf_adjust_symtab): Use groups rather than auto list.  Set up
	pointer from group member to SHT_GROUP section.  Don't size
	SHT_GROUP section or clean up here..
	(elf_frob_file_after_relocs): ..do so here instead.
	* testsuite/gas/arc/jli-1.d,
	* testsuite/gas/elf/groupautob.d,
	* testsuite/gas/mips/compact-eh-eb-2.d,
	* testsuite/gas/mips/compact-eh-eb-5.d,
	* testsuite/gas/mips/compact-eh-el-2.d,
	* testsuite/gas/mips/compact-eh-el-5.d: Adjust.
ld/
	PR 21167
	* testsuite/ld-elf/group9b.d: Adjust for relocs included in group.
2017-10-05 08:38:11 +10:30
..
emulparams [ARC] Add JLI support. 2017-07-19 09:56:55 +02:00
emultempl PowerPC64 --plt-align 2017-09-10 01:55:16 +09:30
po Add new Brazilian Portuguese translation for the ld subdirectory. 2017-08-17 12:13:28 +01:00
scripttempl Add support for PE startup files that want to define their own constructor and desctructor sequencing. 2017-08-10 13:17:12 +01:00
testsuite PR21167, relocation sections not included in groups 2017-10-05 08:38:11 +10:30
.gitignore
aclocal.m4
ChangeLog PR21167, relocation sections not included in groups 2017-10-05 08:38:11 +10:30
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-9197
ChangeLog-9899
config.in Add configure flag to enable gnu hash style by default. 2017-08-08 07:25:39 +09:30
configure Add new Brazilian Portuguese translation for the ld subdirectory. 2017-08-17 12:13:28 +01:00
configure.ac Add new Brazilian Portuguese translation for the ld subdirectory. 2017-08-17 12:13:28 +01:00
configure.host
configure.tgt MIPS/LD: Add OpenBSD/mips64 support 2017-09-19 15:20:41 +01:00
deffile.h
deffilep.y
dep-in.sed
elf-hints-local.h
fdl.texi
gen-doc.texi S/390: Add support for pgste marker 2017-06-23 08:00:46 +02:00
genscrba.sh
genscripts.sh
h8-doc.texi
ld.h Treat common symbol as undefined for --no-define-common 2017-08-06 08:19:04 -07:00
ld.texinfo ld -z relro documentation 2017-10-03 09:36:26 +10:30
ldbuildid.c
ldbuildid.h
ldcref.c
ldctor.c
ldctor.h
ldemul.c
ldemul.h
ldexp.c
ldexp.h
ldfile.c Treat a prefix of "$SYSROOT" in the same way as "=" when parsing linker search paths. 2017-05-18 15:07:59 +01:00
ldfile.h
ldgram.y Treat common symbol as undefined for --no-define-common 2017-08-06 08:19:04 -07:00
ldint.texinfo
ldlang.c PR21970, assertion failed when more than one overlay has subalign specified 2017-10-01 19:35:07 +10:30
ldlang.h LTO rescan archives 2017-09-02 17:39:04 +09:30
ldlex-wrapper.c
ldlex.h ld: Allow section groups to be resolved as part of a relocatable link 2017-06-06 09:53:38 +01:00
ldlex.l ld: Allow section groups to be resolved as part of a relocatable link 2017-06-06 09:53:38 +01:00
ldmain.c LTO rescan archives 2017-09-02 17:39:04 +09:30
ldmain.h
ldmisc.c
ldmisc.h
ldver.c
ldver.h
ldwrite.c
ldwrite.h
lexsup.c Add -z globalaudit linker command line option to set the DF_GLOBALAUDIT flag bit in the dynamic tags. 2017-08-11 16:36:28 +01:00
MAINTAINERS
Makefile.am Apply ld/Makefile.in patch to the correct file 2017-07-07 10:35:31 +09:30
Makefile.in S/390: Add support for pgste marker 2017-06-23 08:00:46 +02:00
mri.c
mri.h
NEWS PR21294, Binary size regression on PPC embedded 2017-10-03 15:11:25 +10:30
pe-dll.c Support pe-bigobj-x86-64 as an output format in 64-bit PE based linkers. 2017-05-09 14:42:43 +01:00
pe-dll.h
pep-dll.c
pep-dll.h
plugin.c Rename non_ir_ref to non_ir_ref_regular 2017-05-16 10:35:02 +09:30
plugin.h
README
stamp-h.in
sysdep.h
testplug2.c
testplug3.c
testplug4.c
testplug.c
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) 2012-2017 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.