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Andrew Burgess c05b575a8d ld: Don't evaluate unneeded PROVIDE expressions.
When creating a linker mapfile (using -Map=MAPFILE), we previously would
always try to evaluate the expression from a PROVIDE statement.

However, this is not always safe, consider:

  PROVIDE (foo = 0x10);
  PROVIDE (bar = foo);

In this example, if neither 'foo' or 'bar' is needed, then while
generating the linker mapfile evaluating the expression for 'foo' is
harmless (just the value 0x10).  However, evaluating the expression for
'bar' requires the symbol 'foo', which is undefined.  This used to cause
a fatal error.

This patch changes the behaviour, so that when the destination of the
PROVIDE is not defined (that is the PROVIDE is not going to provide
anything) the expression is not evaluated, and instead a special string
is displayed to indicate that the linker is discarding the PROVIDE
statement.

This change not only fixes the spurious undefined symbol error, but also
means that a user can now tell if a PROVIDE statement has provided
anything by inspecting the linker mapfile, something that could not be
done before.

ld/ChangeLog:

	* ldlang.c (print_assignment): Only evaluate the expression for a
	PROVIDE'd assignment when the destination is being defined.
	Display a special message for PROVIDE'd symbols that are not being
	provided.

ld/testsuite/ChangeLog:

	* ld-scripts/provide-4.d: New file.
	* ld-scripts/provide-4-map.d: New file.
	* ld-scripts/provide-4.t: New file.
	* ld-scripts/provide-5.d: New file.
	* ld-scripts/provide-5.s: New file.
	* ld-scripts/provide-5-map.d: New file.
	* ld-scripts/provide-5.t: New file.
	* ld-scripts/provide.exp: Run the provide-4.d and provide-5.d
	tests.
2015-01-20 09:49:27 +00:00
bfd Define elf_backend_default_execstack as 0 for Nios II. 2015-01-19 20:02:15 -08:00
binutils Properly check abbrev size 2015-01-12 13:34:24 -08:00
config
cpu
elfcpp
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gas Extend .reloc to accept some BFD_RELOCs 2015-01-19 19:37:46 +10:30
gdb Don't use windows-termcap.c when linking against a curses library 2015-01-19 16:35:11 +01:00
gold Fix a bug in resolving HI16/LO16 relocation pairs for MIPS. 2015-01-14 10:30:14 -08:00
gprof
include S/390: Add support for IBM z13. 2015-01-16 12:28:58 +01:00
intl
ld ld: Don't evaluate unneeded PROVIDE expressions. 2015-01-20 09:49:27 +00:00
libdecnumber
libiberty strerror.c: Do not declare sys_nerr or sys_errlist if already macros 2015-01-19 16:29:07 +01:00
opcodes S/390: Add support for IBM z13. 2015-01-16 12:28:58 +01:00
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sim Build failure in sim/rx/gdb-if.c on windows 2015-01-15 07:21:50 +04:00
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ChangeLog Don't disable gprof for moxie 2015-01-14 19:10:48 -05:00
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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.