PR 5604
* elf-bfd.h (struct elf_backend_data): Add gc_keep. Remove param
names from others.
(_bfd_elf_gc_keep): Declare.
* elfxx-target.h (elf_backend_gc_keep): Define.
(elfNN_bed): Init new field.
* elflink.c (_bfd_elf_gc_keep): New function.
(bfd_elf_gc_sections): Call gc_keep.
* elf64-ppc.c (elf_backend_gc_keep): Define.
(struct _ppc64_elf_section_data): Move .opd related fields to
a struct so they don't occupy the same storage. Adjust accesses
throughout file.
(ppc64_elf_gc_keep): New function, split out from..
(ppc64_elf_gc_mark_hook): ..here. Don't call _bfd_elf_gc_mark
to mark .opd section, just set gc_mark.
(ppc64_elf_edit_opd): Remove no_opd_opt parm. Don't set opd->adjust
unless we are changing .opd. Test non-NULL opd->adjust at all
accesses throughout file.
* elf64-ppc.h (ppc64_elf_edit_opd): Update prototype.
ld/
PR 5604
* ldlang.c (lang_gc_sections): Move code to set SEC_KEEP on entry
syms to _bfd_elf_gc_keep.
* emultempl/ppc64elf.em (ppc_before_allocation): Don't call
ppc64_elf_edit_opd if no_opd_opt.
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.
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