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Alan Modra a4cd947aca PR23425, unresolved symbol diagnostic
dwarf2.c code reasonably assumes that debug info is local to a file,
an assumption now violated by gcc, resulting in "DWARF error: invalid
abstract instance DIE ref" or wrong details when attempting to print
linker error messages with file, function and line reported.

This is because find_abstract_instance is only prepared to handle
DW_FORM_ref_addr when the .debug_info section referenced is in the
current file.  When that isn't the case, relocations to access another
file's .debug_info will typically be against a symbol defined at the
start of that .debug_info section, plus an addend.  Since the dwarf2.c
code only considers the current file's debug info, that symbol will be
undefined, resolving to zero.  In effect the ref_addr will wrongly
resolve to the current file's .debug_info.

This patch avoids the problem by treating relocations in debug
sections against undefined symbols in a similar manner to the way
relocations against symbols defined in discarded sections are
resolved.  They result in a zero value (except in .debug_ranges)
regardless of the addend.

	PR 23425
	* reloc.c (bfd_generic_get_relocated_section_contents): Zero reloc
	fields in debug sections when reloc is against an undefined symbol
	and called from bfd_simple_get_relocated_section_contents or
	similar.
	* dwarf2.c (find_abstract_instance): Return true for zero offset
	DW_FORM_ref_addr without returning values.
2018-09-14 21:21:28 +09:30
bfd PR23425, unresolved symbol diagnostic 2018-09-14 21:21:28 +09:30
binutils Add a testcase for PR binutils/23633 2018-09-13 09:09:15 -07:00
config
contrib Update dg-extract-results.* from gcc 2018-08-06 16:05:16 +02:00
cpu
elfcpp [MIPS] Add Loongson 2K1000 proccessor support. 2018-08-29 20:55:25 +08:00
etc
gas x86: fold CRC32 templates 2018-09-14 11:21:15 +02:00
gdb Testsuite: Add gdb_simple_compile 2018-09-14 09:56:52 +01:00
gold [MIPS] Add Loongson 2K1000 proccessor support. 2018-08-29 20:55:25 +08:00
gprof
include Disable -Wformat-nonliteral in parts of printcmd.c 2018-09-05 21:47:33 -06:00
intl Backport gettext fixes to get rid of warnings on macOS 2018-08-02 14:56:02 -04:00
ld Updated Finnish translation for the ld sub-directory. 2018-09-03 13:40:32 +01:00
libdecnumber
libiberty
opcodes x86: fold CRC32 templates 2018-09-14 11:21:15 +02:00
readline
sim
texinfo
zlib
.cvsignore
.gitattributes
.gitignore
ar-lib
ChangeLog Add "contrib" to the list of GDB support dirs (on src-release.sh) 2018-09-13 12:33:19 -04:00
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config-ml.in
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src-release.sh Add "contrib" to the list of GDB support dirs (on src-release.sh) 2018-09-13 12:33:19 -04:00
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		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.