freebsd-dev/contrib/binutils/ld
Tijl Coosemans caf5f7a84c In r253839 the default behaviour of ld(1) was changed such that all
libraries that need to be linked into an executable or library have to be
listed on the command line explicitly.  This commit fixes a bug in ld(1)
where it would scan dependencies of the libraries on the command line and
link them if needed if they were also found in ld.so.cache.

The important bit of the patch is the initialisation of needed.by such that
libraries found by scanning dependencies are marked as such and not used in
the link.

The patch is a backport of binutils git commit
d5c8b1f8561426b41aa5330ed60f578178fe6be2

The author gave permission to use it under GPLv2 terms.

PR:		192062
Exp-run by:	antoine
MFC after:	1 week
2014-08-28 18:33:42 +00:00
..
emulparams Rename the linker emulation name for powerpc and powerc64. This is needed that 2011-11-19 19:25:57 +00:00
emultempl In r253839 the default behaviour of ld(1) was changed such that all 2014-08-28 18:33:42 +00:00
po Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
scripttempl Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
aclocal.m4 Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ChangeLog Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ChangeLog-0001 Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
ChangeLog-0203 Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
ChangeLog-2006 Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ChangeLog-9197 Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
ChangeLog-9899 Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
config.in Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
configure Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
configure.host Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
configure.in Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
configure.tgt Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
deffile.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
deffilep.y Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
dep-in.sed Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
fdl.texi Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
gen-doc.texi Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
genscripts.sh Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
h8-doc.texi Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
ld.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ld.texinfo Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldcref.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldctor.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldctor.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
ldemul.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldemul.h Add a workaround for the warnings and sometimes errors due to missed 2011-01-14 11:25:11 +00:00
ldexp.c Fix clang warnings. 2011-06-18 13:56:33 +00:00
ldexp.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldfile.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldfile.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
ldgram.y Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldint.texinfo Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldlang.c Fix clang warnings. 2011-05-22 22:16:19 +00:00
ldlang.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldlex.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldlex.l Improve compatibility with recent flex from flex.sourceforge.net. 2013-05-03 23:51:32 +00:00
ldmain.c Change default behaviour of ld(1) to not recursively copy DT_NEEDED 2013-07-31 12:35:06 +00:00
ldmain.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
ldmisc.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldmisc.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldver.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldver.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
ldwrite.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
ldwrite.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
lexsup.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
MAINTAINERS Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
Makefile.am Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
Makefile.in Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
mri.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
mri.h Merge ^vendor/binutils/dist@214082 into contrib/binutils. 2010-10-21 19:11:14 +00:00
NEWS Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
pe-dll.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
pe-dll.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
pep-dll.c Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
pep-dll.h Merge ^/vendor/binutils/dist@214571 into contrib/binutils, which brings 2010-11-01 19:35:33 +00:00
README Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
stamp-h.in Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00
sysdep.h Fix clang warnings. 2011-06-18 13:56:33 +00:00
TODO Rename vendor/binutils/*/contrib to vendor/binutils/*/x 2009-01-19 17:25:17 +00:00

		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.