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Cary Coutant 648c5cbbf3 Fix problem where gold fails to issue an undefined symbol error during LTO.
During LTO, if (1) an IR file contains a COMDAT group that is kept,
(2) a later non-claimed file contains the same group, which we discard,
and (3) the plugin fails to provide a definition of the symbols in that
COMDAT group, gold silently resolves any references to those symbols
to 0.

This patch adds a check for a placeholder symbol when deciding
whether to issue an undefined symbol error. It also adds an extra
note after any undefined placeholder symbol error that explains
that a definition was expected from the plugin.

gold/
	PR gold/19842
	* errors.cc (Errors::undefined_symbol): Add info message when
	symbol should have been provided by a plugin.
	* target-reloc.h (issue_undefined_symbol_error): Check for
	placeholder symbols defined in discarded sections.
	* testsuite/Makefile.am (plugin_test_9b): New test case.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/plugin_test_9b_elf.cc: New test source file.
	* testsuite/plugin_test_9b_ir.cc: New test source file.
2016-03-21 21:42:15 -07:00
bfd Binutils fails to build with -O0 2016-03-22 14:24:30 +10:30
binutils arc: Add nps400 machine type, and assembler flag. 2016-03-21 16:44:49 +00:00
config Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
cpu Correct fr30 comment 2016-03-03 12:55:30 +10:30
elfcpp Remove is_n64_ data member from Mips_relobj class. 2016-03-18 14:54:35 -07:00
etc Remove spurious empty line in changelog entry. 2016-03-18 13:09:03 +00:00
gas arc/nps400: Add first nps400 instructions 2016-03-21 16:44:50 +00:00
gdb ARM process record: median instructions 2016-03-21 10:41:38 +00:00
gold Fix problem where gold fails to issue an undefined symbol error during LTO. 2016-03-21 21:42:15 -07:00
gprof Remove use of alloca. 2016-03-21 16:31:46 +00:00
include arc/nps400: Add first nps400 instructions 2016-03-21 16:44:50 +00:00
intl
ld Remove use of alloca. 2016-03-21 16:31:46 +00:00
libdecnumber
libiberty Sync libiberty with GCC. 2016-01-28 21:44:42 +01:00
opcodes arc/nps400: Add first nps400 instructions 2016-03-21 16:44:50 +00:00
readline
sim Fix thinko in new GET_VEC_ELEMENT macro. 2016-03-18 17:08:27 +00:00
texinfo
zlib
.cvsignore
.gitattributes
.gitignore Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
ChangeLog Add mips and s390 build targets for gold. 2016-03-17 15:37:10 -07:00
compile
config-ml.in
config.guess Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
config.rpath
config.sub Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
configure Add mips and s390 build targets for gold. 2016-03-17 15:37:10 -07:00
configure.ac Add mips and s390 build targets for gold. 2016-03-17 15:37:10 -07:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4 Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.in Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
Makefile.tpl Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release.sh fix gdb version parsing in src-release.sh 2016-01-17 10:01:55 +04:00
symlink-tree
ylwrap

		   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.