Implement -z dynamic-undefined-weak

-z nodynamic-undefined-weak is only implemented for x86.  (The sparc
backend has some support code but doesn't enable the option by
including ld/emulparams/dynamic_undefined_weak.sh, and since the
support looks like it may be broken I haven't enabled it.)  This patch
adds the complementary -z dynamic-undefined-weak, extends both options
to affect building of shared libraries as well as executables, and
adds support for the option on powerpc.

include/
	* bfdlink.h (struct bfd_link_info <dynamic_undefined_weak>):
	Revise comment.
bfd/
	* elflink.c (_bfd_elf_adjust_dynamic_symbol): Hide undefweak
	or make dynamic for info->dynamic_undefined_weak 0 and 1.
	* elf32-ppc.c:Formatting.
	(ensure_undefweak_dynamic): Don't make dynamic when
	info->dynamic_undefined_weak is zero.
	(allocate_dynrelocs): Discard undefweak dyn_relocs for
	info->dynamic_undefined_weak.  Discard undef dyn_relocs when
	not default visibility.  Discard undef and undefweak
	dyn_relocs earlier.
	(ppc_elf_relocate_section): Adjust to suit.
	* elf64-ppc.c: Formatting.
	(ensure_undefweak_dynamic): Don't make dynamic when
	info->dynamic_undefined_weak is zero.
	(allocate_dynrelocs): Discard undefweak dyn_relocs for
	info->dynamic_undefined_weak.  Discard them earlier.
ld/
	* ld.texinfo (dynamic-undefined-weak): Document.
	(nodynamic-undefined-weak): Document that this option now can
	be used with shared libs.
	* emulparams/dynamic_undefined_weak.sh: Support -z
	dynamic-undefined-weak.
	* emulparams/elf32ppccommon.sh: Include dynamic_undefined_weak.sh.
	* testsuite/ld-undefined/weak-undef.exp (undef_weak_so),
	(undef_weak_exe): New.  Use them.  Add -z dynamic-undefined-weak
	and -z nodynamic-undefined-weak tests.
	* Makefile.am: Update powerpc dependencies.
	* Makefile.in: Regenerate.

1 files changed, 17 insertions, 4 deletions

diff --git a/ld/Makefile.in b/ld/Makefile.in
index c464302..f485f4f 100644
--- a/ld/Makefile.in
+++ b/ld/Makefile.in
@@ -2721,23 +2721,27 @@ eelf32lmip.c: $(srcdir)/emulparams/elf32lmip.sh \
 eelf32lppc.c: $(srcdir)/emulparams/elf32lppc.sh \
   $(srcdir)/emulparams/elf32ppccommon.sh \
   $(srcdir)/emulparams/elf32ppc.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32lppclinux.c: $(srcdir)/emulparams/elf32lppclinux.sh \
   $(srcdir)/emulparams/elf32lppc.sh $(srcdir)/emulparams/elf32ppc.sh \
   $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32lppcnto.c: $(srcdir)/emulparams/elf32lppcnto.sh \
   $(srcdir)/emulparams/elf32ppc.sh $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32lppcsim.c: $(srcdir)/emulparams/elf32lppcsim.sh \
   $(srcdir)/emulparams/elf32lppc.sh $(srcdir)/emulparams/elf32ppc.sh \
   $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
@@ -2817,31 +2821,37 @@ eelf32or1k_linux.c: $(srcdir)/emulparams/elf32or1k_linux.sh \
 
 eelf32ppc.c: $(srcdir)/emulparams/elf32ppc.sh \
   $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32ppc_fbsd.c: $(srcdir)/emulparams/elf32ppc_fbsd.sh \
   $(srcdir)/emulparams/elf32ppc.sh $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32ppclinux.c: $(srcdir)/emulparams/elf32ppclinux.sh \
   $(srcdir)/emulparams/elf32ppc.sh $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32ppcnto.c: $(srcdir)/emulparams/elf32ppcnto.sh \
   $(srcdir)/emulparams/elf32ppc.sh $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32ppcsim.c: $(srcdir)/emulparams/elf32ppcsim.sh \
   $(srcdir)/emulparams/elf32ppc.sh $(srcdir)/emulparams/elf32ppccommon.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf32ppcvxworks.c: $(srcdir)/emulparams/elf32ppcvxworks.sh \
   $(srcdir)/emulparams/elf32ppccommon.sh $(srcdir)/emulparams/vxworks.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc32elf.em ldemul-list.h \
   $(srcdir)/emultempl/vxworks.em \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
@@ -3540,8 +3550,9 @@ eelf64hppa.c: $(srcdir)/emulparams/elf64hppa.sh \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf64hppa.sc ${GEN_DEPENDS}
 
 eelf64lppc.c: $(srcdir)/emulparams/elf64lppc.sh \
-  $(srcdir)/emulparams/elf64ppc.sh $(srcdir)/emultempl/ppc64elf.em \
-  ldemul-list.h \
+  $(srcdir)/emulparams/elf64ppc.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
+  $(srcdir)/emultempl/ppc64elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf64lriscv.c: $(srcdir)/emulparams/elf64lriscv.sh \
@@ -3564,11 +3575,13 @@ eelf64mmix.c: $(srcdir)/emulparams/elf64mmix.sh \
   $(ELF_DEPS) $(srcdir)/emultempl/mmix-elfnmmo.em \
   $(srcdir)/emultempl/mmixelf.em $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
-eelf64ppc.c: $(srcdir)/emulparams/elf64ppc.sh $(srcdir)/emultempl/ppc64elf.em \
-  ldemul-list.h \
+eelf64ppc.c: $(srcdir)/emulparams/elf64ppc.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
+  $(srcdir)/emultempl/ppc64elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}
 
 eelf64ppc_fbsd.c: $(srcdir)/emulparams/elf64ppc_fbsd.sh \
+  $(srcdir)/emulparams/dynamic_undefined_weak.sh \
   $(srcdir)/emultempl/ppc64elf.em ldemul-list.h \
   $(ELF_DEPS) $(srcdir)/scripttempl/elf.sc ${GEN_DEPENDS}