libctf, link: add lazy linking: clean up input members: err/warn cleanup

This rather large and intertwined pile of changes does three things:

First, it transitions from dprintf to ctf_err_warn for things the user might
care about: this one file is the major impetus for the ctf_err_warn
infrastructure, because things like file names are crucial in linker
error messages, and errno values are utterly incapable of
communicating them

Second, it stabilizes the ctf_link APIs: you can now call
ctf_link_add_ctf without a CTF argument (only a NAME), to lazily
ctf_open the file with the given NAME when needed, and close it as soon
as possible, to save memory.  This is not an API change because a null
CTF argument was prohibited before now.

Since getting CTF directly from files uses ctf_open, passing in only a
NAME requires use of libctf, not libctf-nobfd.  The linker's behaviour
is unchanged, as it still passes in a ctf_archive_t as before.

This also let us fix a leak: we were opening ctf_archives and their
containing ctf_files, then only closing the files and leaving the
archives open.

Third, this commit restructures the ctf_link_in_member argument used by
the CTF linking machinery and adjusts its users accordingly.

We drop two members:

- arcname, which is difficult to construct and then only used in error
  messages (that were only dprintf()ed, so never seen!)
- share_mode, since we store the flags passed to ctf_link (including the
  share mode) in a new ctf_file_t.ctf_link_flags to help dedup get hold
  of it

We rename others whose existing names were fairly dreadful:

- done_main_member -> done_parent, using consistent terminology for .ctf
  as the parent of all archive members
- main_input_fp -> in_fp_parent, likewise
- file_name -> in_file_name, likewise

We add one new member, cu_mapped.

Finally, we move the various frees of things like mapping table data to
the top-level ctf_link, since deduplicating links will want to do that
too.

include/
	* ctf-api.h (ECTF_NEEDSBFD): New.
	(ECTF_NERR): Adjust.
	(ctf_link): Rename share_mode arg to flags.
libctf/
	* Makefile.am: Set -DNOBFD=1 in libctf-nobfd, and =0 elsewhere.
	* Makefile.in: Regenerated.
	* ctf-impl.h (ctf_link_input_name): New.
	(ctf_file_t) <ctf_link_flags>: New.
	* ctf-create.c (ctf_serialize): Adjust accordingly.
	* ctf-link.c: Define ctf_open as weak when PIC.
	(ctf_arc_close_thunk): Remove unnecessary thunk.
	(ctf_file_close_thunk): Likewise.
	(ctf_link_input_name): New.
	(ctf_link_input_t): New value of the ctf_file_t.ctf_link_input.
	(ctf_link_input_close): Adjust accordingly.
	(ctf_link_add_ctf_internal): New, split from...
	(ctf_link_add_ctf): ... here.  Return error if lazy loading of
	CTF is not possible.  Change to just call...
	(ctf_link_add): ... this new function.
	(ctf_link_add_cu_mapping): Transition to ctf_err_warn.  Drop the
	ctf_file_close_thunk.
	(ctf_link_in_member_cb_arg_t) <file_name> Rename to...
	<in_file_name>: ... this.
	<arcname>: Drop.
	<share_mode>: Likewise (migrated to ctf_link_flags).
	<done_main_member>: Rename to...
	<done_parent>: ... this.
	<main_input_fp>: Rename to...
	<in_fp_parent>: ... this.
	<cu_mapped>: New.
	(ctf_link_one_type): Adjuwt accordingly.  Transition to
	ctf_err_warn, removing a TODO.
	(ctf_link_one_variable): Note a case too common to warn about.
	Report in the debug stream if a cu-mapped link prevents addition
	of a conflicting variable.
	(ctf_link_one_input_archive_member): Adjust.
	(ctf_link_lazy_open): New, open a CTF archive for linking when
	needed.
	(ctf_link_close_one_input_archive): New, close it again.
	(ctf_link_one_input_archive): Adjust for lazy opening, member
	renames, and ctf_err_warn transition.  Move the
	empty_link_type_mapping call to...
	(ctf_link): ... here.  Adjut for renamings and thunk removal.
	Don't spuriously fail if some input contains no CTF data.
	(ctf_link_write): ctf_err_warn transition.
	* libctf.ver: Remove not-yet-stable comment.

7 files changed, 601 insertions, 128 deletions

diff --git a/libctf/ChangeLog b/libctf/ChangeLog
index d54af35..c3451ee 100644
--- a/libctf/ChangeLog
+++ b/libctf/ChangeLog
@@ -1,5 +1,50 @@
 2020-07-22  Nick Alcock  <nick.alcock@oracle.com>
 
+	* Makefile.am: Set -DNOBFD=1 in libctf-nobfd, and =0 elsewhere.
+	* Makefile.in: Regenerated.
+	* ctf-impl.h (ctf_link_input_name): New.
+	(ctf_file_t) <ctf_link_flags>: New.
+	* ctf-create.c (ctf_serialize): Adjust accordingly.
+	* ctf-link.c: Define ctf_open as weak when PIC.
+	(ctf_arc_close_thunk): Remove unnecessary thunk.
+	(ctf_file_close_thunk): Likewise.
+	(ctf_link_input_name): New.
+	(ctf_link_input_t): New value of the ctf_file_t.ctf_link_input.
+	(ctf_link_input_close): Adjust accordingly.
+	(ctf_link_add_ctf_internal): New, split from...
+	(ctf_link_add_ctf): ... here.  Return error if lazy loading of
+	CTF is not possible.  Change to just call...
+	(ctf_link_add): ... this new function.
+	(ctf_link_add_cu_mapping): Transition to ctf_err_warn.  Drop the
+	ctf_file_close_thunk.
+	(ctf_link_in_member_cb_arg_t) <file_name> Rename to...
+	<in_file_name>: ... this.
+	<arcname>: Drop.
+	<share_mode>: Likewise (migrated to ctf_link_flags).
+	<done_main_member>: Rename to...
+	<done_parent>: ... this.
+	<main_input_fp>: Rename to...
+	<in_fp_parent>: ... this.
+	<cu_mapped>: New.
+	(ctf_link_one_type): Adjuwt accordingly.  Transition to
+	ctf_err_warn, removing a TODO.
+	(ctf_link_one_variable): Note a case too common to warn about.
+	Report in the debug stream if a cu-mapped link prevents addition
+	of a conflicting variable.
+	(ctf_link_one_input_archive_member): Adjust.
+	(ctf_link_lazy_open): New, open a CTF archive for linking when
+	needed.
+	(ctf_link_close_one_input_archive): New, close it again.
+	(ctf_link_one_input_archive): Adjust for lazy opening, member
+	renames, and ctf_err_warn transition.  Move the
+	empty_link_type_mapping call to...
+	(ctf_link): ... here.  Adjut for renamings and thunk removal.
+	Don't spuriously fail if some input contains no CTF data.
+	(ctf_link_write): ctf_err_warn transition.
+	* libctf.ver: Remove not-yet-stable comment.
+
+2020-07-22  Nick Alcock  <nick.alcock@oracle.com>
+
 	* ctf-impl.h (ctf_strerror): Delete.
 	* ctf-subr.c (ctf_strerror): Likewise.
 	* ctf-error.c (ctf_errmsg): Stop using ctf_strerror: just use
diff --git a/libctf/Makefile.am b/libctf/Makefile.am
index cdd3a5c..de27cf8 100644
--- a/libctf/Makefile.am
+++ b/libctf/Makefile.am
@@ -41,6 +41,7 @@ endif
 
 libctf_nobfd_la_LIBADD = @SHARED_LIBADD@ $(ZLIB)
 libctf_nobfd_la_LDFLAGS = -version-info 0:0:0 @SHARED_LDFLAGS@ @VERSION_FLAGS@
+libctf_nobfd_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=1
 libctf_nobfd_la_SOURCES = ctf-archive.c ctf-dump.c ctf-create.c ctf-decl.c ctf-error.c \
 			  ctf-hash.c ctf-labels.c ctf-link.c ctf-lookup.c ctf-open.c \
 			  ctf-string.c ctf-subr.c ctf-types.c ctf-util.c
@@ -49,6 +50,7 @@ libctf_nobfd_la_SOURCES += ctf-qsort_r.c
 endif
 
 libctf_la_LIBADD = @BFD_LIBADD@ $(libctf_nobfd_la_LIBADD)
+libctf_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=0
 libctf_la_DEPENDENCIES = @BFD_DEPENDENCIES@
 libctf_la_LDFLAGS = $(libctf_nobfd_la_LDFLAGS)
 libctf_la_SOURCES = $(libctf_nobfd_la_SOURCES) ctf-open-bfd.c
diff --git a/libctf/Makefile.in b/libctf/Makefile.in
index a26fa31..3b7feea 100644
--- a/libctf/Makefile.in
+++ b/libctf/Makefile.in
@@ -167,11 +167,15 @@ am__libctf_nobfd_la_SOURCES_DIST = ctf-archive.c ctf-dump.c \
 	ctf-create.c ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c \
 	ctf-link.c ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c \
 	ctf-types.c ctf-util.c ctf-qsort_r.c
-@NEED_CTF_QSORT_R_TRUE@am__objects_1 = ctf-qsort_r.lo
-am_libctf_nobfd_la_OBJECTS = ctf-archive.lo ctf-dump.lo ctf-create.lo \
-	ctf-decl.lo ctf-error.lo ctf-hash.lo ctf-labels.lo ctf-link.lo \
-	ctf-lookup.lo ctf-open.lo ctf-string.lo ctf-subr.lo \
-	ctf-types.lo ctf-util.lo $(am__objects_1)
+@NEED_CTF_QSORT_R_TRUE@am__objects_1 = libctf_nobfd_la-ctf-qsort_r.lo
+am_libctf_nobfd_la_OBJECTS = libctf_nobfd_la-ctf-archive.lo \
+	libctf_nobfd_la-ctf-dump.lo libctf_nobfd_la-ctf-create.lo \
+	libctf_nobfd_la-ctf-decl.lo libctf_nobfd_la-ctf-error.lo \
+	libctf_nobfd_la-ctf-hash.lo libctf_nobfd_la-ctf-labels.lo \
+	libctf_nobfd_la-ctf-link.lo libctf_nobfd_la-ctf-lookup.lo \
+	libctf_nobfd_la-ctf-open.lo libctf_nobfd_la-ctf-string.lo \
+	libctf_nobfd_la-ctf-subr.lo libctf_nobfd_la-ctf-types.lo \
+	libctf_nobfd_la-ctf-util.lo $(am__objects_1)
 libctf_nobfd_la_OBJECTS = $(am_libctf_nobfd_la_OBJECTS)
 AM_V_lt = $(am__v_lt_@AM_V@)
 am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
@@ -188,11 +192,15 @@ am__libctf_la_SOURCES_DIST = ctf-archive.c ctf-dump.c ctf-create.c \
 	ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c ctf-link.c \
 	ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c ctf-types.c \
 	ctf-util.c ctf-qsort_r.c ctf-open-bfd.c
-am__objects_2 = ctf-archive.lo ctf-dump.lo ctf-create.lo ctf-decl.lo \
-	ctf-error.lo ctf-hash.lo ctf-labels.lo ctf-link.lo \
-	ctf-lookup.lo ctf-open.lo ctf-string.lo ctf-subr.lo \
-	ctf-types.lo ctf-util.lo $(am__objects_1)
-am_libctf_la_OBJECTS = $(am__objects_2) ctf-open-bfd.lo
+@NEED_CTF_QSORT_R_TRUE@am__objects_2 = libctf_la-ctf-qsort_r.lo
+am__objects_3 = libctf_la-ctf-archive.lo libctf_la-ctf-dump.lo \
+	libctf_la-ctf-create.lo libctf_la-ctf-decl.lo \
+	libctf_la-ctf-error.lo libctf_la-ctf-hash.lo \
+	libctf_la-ctf-labels.lo libctf_la-ctf-link.lo \
+	libctf_la-ctf-lookup.lo libctf_la-ctf-open.lo \
+	libctf_la-ctf-string.lo libctf_la-ctf-subr.lo \
+	libctf_la-ctf-types.lo libctf_la-ctf-util.lo $(am__objects_2)
+am_libctf_la_OBJECTS = $(am__objects_3) libctf_la-ctf-open-bfd.lo
 libctf_la_OBJECTS = $(am_libctf_la_OBJECTS)
 libctf_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -444,11 +452,13 @@ AM_CFLAGS = -std=gnu99 @ac_libctf_warn_cflags@ @warn@ @c_warn@ @WARN_PEDANTIC@ @
 @INSTALL_LIBBFD_FALSE@noinst_LTLIBRARIES = libctf.la libctf-nobfd.la
 libctf_nobfd_la_LIBADD = @SHARED_LIBADD@ $(ZLIB)
 libctf_nobfd_la_LDFLAGS = -version-info 0:0:0 @SHARED_LDFLAGS@ @VERSION_FLAGS@
+libctf_nobfd_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=1
 libctf_nobfd_la_SOURCES = ctf-archive.c ctf-dump.c ctf-create.c \
 	ctf-decl.c ctf-error.c ctf-hash.c ctf-labels.c ctf-link.c \
 	ctf-lookup.c ctf-open.c ctf-string.c ctf-subr.c ctf-types.c \
 	ctf-util.c $(am__append_1)
 libctf_la_LIBADD = @BFD_LIBADD@ $(libctf_nobfd_la_LIBADD)
+libctf_la_CPPFLAGS = $(AM_CPPFLAGS) -DNOBFD=0
 libctf_la_DEPENDENCIES = @BFD_DEPENDENCIES@
 libctf_la_LDFLAGS = $(libctf_nobfd_la_LDFLAGS)
 libctf_la_SOURCES = $(libctf_nobfd_la_SOURCES) ctf-open-bfd.c
@@ -565,22 +575,37 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-archive.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-create.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-decl.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-dump.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-error.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-hash.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-labels.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-link.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-lookup.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-open-bfd.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-open.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-qsort_r.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-string.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-subr.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-types.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ctf-util.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-archive.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-create.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-decl.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-dump.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-error.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-hash.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-labels.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-link.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-lookup.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-open-bfd.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-open.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-qsort_r.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-string.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-subr.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-types.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_la-ctf-util.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-archive.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-create.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-decl.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-dump.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-error.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-hash.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-labels.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-link.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-lookup.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-open.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-qsort_r.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-string.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-subr.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-types.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libctf_nobfd_la-ctf-util.Plo@am__quote@
 
 .c.o:
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
@@ -603,6 +628,223 @@ distclean-compile:
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
 
+libctf_nobfd_la-ctf-archive.lo: ctf-archive.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_nobfd_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libctf_nobfd_la-ctf-archive.lo -MD -MP -MF $(DEPDIR)/libctf_nobfd_la-ctf-archive.Tpo -c -o libctf_nobfd_la-ctf-archive.lo `test -f 'ctf-archive.c' || echo '$(srcdir)/'`ctf-archive.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libctf_nobfd_la-ctf-archive.Tpo $(DEPDIR)/libctf_nobfd_la-ctf-archive.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ctf-archive.c' object='libctf_nobfd_la-ctf-archive.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_nobfd_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libctf_nobfd_la-ctf-archive.lo `test -f 'ctf-archive.c' || echo '$(srcdir)/'`ctf-archive.c
+
+libctf_nobfd_la-ctf-dump.lo: ctf-dump.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_nobfd_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libctf_nobfd_la-ctf-dump.lo -MD -MP -MF $(DEPDIR)/libctf_nobfd_la-ctf-dump.Tpo -c -o libctf_nobfd_la-ctf-dump.lo `test -f 'ctf-dump.c' || echo '$(srcdir)/'`ctf-dump.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libctf_nobfd_la-ctf-dump.Tpo $(DEPDIR)/libctf_nobfd_la-ctf-dump.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ctf-dump.c' object='libctf_nobfd_la-ctf-dump.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_nobfd_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o libctf_nobfd_la-ctf-dump.lo `test -f 'ctf-dump.c' || echo '$(srcdir)/'`ctf-dump.c
+
+libctf_nobfd_la-ctf-create.lo: ctf-create.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_nobfd_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libctf_nobfd_la-ctf-create.lo -MD -MP -MF $(DEPDIR)/libctf_nobfd_la-ctf-create.Tpo -c -o libctf_nobfd_la-ctf-create.lo `test -f 'ctf-create.c' || echo '$(srcdir)/'`ctf-create.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libctf_nobfd_la-ctf-create.Tpo $(DEPDIR)/libctf_nobfd_la-ctf-create.Plo
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+libctf_la-ctf-labels.lo: ctf-labels.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libctf_la-ctf-labels.lo -MD -MP -MF $(DEPDIR)/libctf_la-ctf-labels.Tpo -c -o libctf_la-ctf-labels.lo `test -f 'ctf-labels.c' || echo '$(srcdir)/'`ctf-labels.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libctf_la-ctf-labels.Tpo $(DEPDIR)/libctf_la-ctf-labels.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='ctf-labels.c' object='libctf_la-ctf-labels.lo' libtool=yes @AMDEPBACKSLASH@
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+
+libctf_la-ctf-link.lo: ctf-link.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libctf_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libctf_la-ctf-link.lo -MD -MP -MF $(DEPDIR)/libctf_la-ctf-link.Tpo -c -o libctf_la-ctf-link.lo `test -f 'ctf-link.c' || echo '$(srcdir)/'`ctf-link.c
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+libctf_la-ctf-lookup.lo: ctf-lookup.c
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+
+libctf_la-ctf-open.lo: ctf-open.c
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+libctf_la-ctf-string.lo: ctf-string.c
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+
+libctf_la-ctf-qsort_r.lo: ctf-qsort_r.c
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+libctf_la-ctf-open-bfd.lo: ctf-open-bfd.c
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+
 mostlyclean-libtool:
 	-rm -f *.lo
 
diff --git a/libctf/ctf-create.c b/libctf/ctf-create.c
index a964c20..85fd060 100644
--- a/libctf/ctf-create.c
+++ b/libctf/ctf-create.c
@@ -542,6 +542,7 @@ ctf_serialize (ctf_file_t *fp)
   nfp->ctf_link_type_mapping = fp->ctf_link_type_mapping;
   nfp->ctf_link_memb_name_changer = fp->ctf_link_memb_name_changer;
   nfp->ctf_link_memb_name_changer_arg = fp->ctf_link_memb_name_changer_arg;
+  nfp->ctf_link_flags = fp->ctf_link_flags;
 
   nfp->ctf_snapshot_lu = fp->ctf_snapshots;
 
diff --git a/libctf/ctf-impl.h b/libctf/ctf-impl.h
index 71b732a..cb7de23 100644
--- a/libctf/ctf-impl.h
+++ b/libctf/ctf-impl.h
@@ -314,6 +314,9 @@ struct ctf_file
   ctf_dynhash_t *ctf_link_type_mapping; /* Map input types to output types.  */
   ctf_dynhash_t *ctf_link_cu_mapping;	/* Map CU names to CTF dict names.  */
   /* Allow the caller to Change the name of link archive members.  */
+  /* CTF linker flags.  */
+  int ctf_link_flags;
+
   ctf_link_memb_name_changer_f *ctf_link_memb_name_changer;
   void *ctf_link_memb_name_changer_arg; /* Argument for it.  */
   ctf_dynhash_t *ctf_add_processing; /* Types ctf_add_type is working on now.  */
@@ -560,6 +563,7 @@ _libctf_printflike_ (3, 4)
 extern void ctf_err_warn (ctf_file_t *, int is_warning, const char *, ...);
 extern void ctf_assert_fail_internal (ctf_file_t *, const char *,
 				      size_t, const char *);
+extern const char *ctf_link_input_name (ctf_file_t *);
 
 extern Elf64_Sym *ctf_sym_to_elf64 (const Elf32_Sym *src, Elf64_Sym *dst);
 extern const char *ctf_lookup_symbol_name (ctf_file_t *fp, unsigned long symidx);
diff --git a/libctf/ctf-link.c b/libctf/ctf-link.c
index bcfd256..705701d 100644
--- a/libctf/ctf-link.c
+++ b/libctf/ctf-link.c
@@ -20,6 +20,10 @@
 #include <ctf-impl.h>
 #include <string.h>
 
+#if defined (PIC)
+#pragma weak ctf_open
+#endif
+
 /* Type tracking machinery.  */
 
 /* Record the correspondence between a source and ctf_add_type()-added
@@ -137,45 +141,143 @@ ctf_type_mapping (ctf_file_t *src_fp, ctf_id_t src_type, ctf_file_t **dst_fp)
    (otherwise) and returns it, suitable for addition in the .ctf section of the
    output.  */
 
-/* Add a file to a link.  */
-
-static void ctf_arc_close_thunk (void *arc)
+/* Return the name of the compilation unit this CTF dict or its parent applies
+   to, or a non-null string otherwise: prefer the parent.  Used in debugging
+   output.  Sometimes used for outputs too.  */
+const char *
+ctf_link_input_name (ctf_file_t *fp)
 {
-  ctf_arc_close ((ctf_archive_t *) arc);
+  if (fp->ctf_parent && fp->ctf_parent->ctf_cuname)
+    return fp->ctf_parent->ctf_cuname;
+  else if (fp->ctf_cuname)
+    return fp->ctf_cuname;
+  else
+    return "(unnamed)";
 }
 
-static void ctf_file_close_thunk (void *file)
+/* The linker inputs look like this.  clin_fp is used for short-circuited
+   CU-mapped links that can entirely avoid the first link phase in some
+   situations in favour of just passing on the contained ctf_file_t: it is
+   always the sole ctf_file_t inside the corresponding clin_arc.  If set, it
+   gets assigned directly to the final link inputs and freed from there, so it
+   never gets explicitly freed in the ctf_link_input.  */
+typedef struct ctf_link_input
+{
+  const char *clin_filename;
+  ctf_archive_t *clin_arc;
+  ctf_file_t *clin_fp;
+  int n;
+} ctf_link_input_t;
+
+static void
+ctf_link_input_close (void *input)
 {
-  ctf_file_close ((ctf_file_t *) file);
+  ctf_link_input_t *i = (ctf_link_input_t *) input;
+  if (i->clin_arc)
+    ctf_arc_close (i->clin_arc);
+  free (i);
 }
 
-int
-ctf_link_add_ctf (ctf_file_t *fp, ctf_archive_t *ctf, const char *name)
+/* Like ctf_link_add_ctf, below, but with no error-checking, so it can be called
+   in the middle of an ongoing link.  */
+static int
+ctf_link_add_ctf_internal (ctf_file_t *fp, ctf_archive_t *ctf,
+			   ctf_file_t *fp_input, const char *name)
 {
+  ctf_link_input_t *input = NULL;
   char *dupname = NULL;
 
-  if (fp->ctf_link_outputs)
-    return (ctf_set_errno (fp, ECTF_LINKADDEDLATE));
-  if (fp->ctf_link_inputs == NULL)
-    fp->ctf_link_inputs = ctf_dynhash_create (ctf_hash_string,
-					      ctf_hash_eq_string, free,
-					      ctf_arc_close_thunk);
-
-  if (fp->ctf_link_inputs == NULL)
+  if ((input = calloc (1, sizeof (ctf_link_input_t))) == NULL)
     goto oom;
 
   if ((dupname = strdup (name)) == NULL)
     goto oom;
 
-  if (ctf_dynhash_insert (fp->ctf_link_inputs, dupname, ctf) < 0)
+  input->clin_arc = ctf;
+  input->clin_fp = fp_input;
+  input->clin_filename = dupname;
+  input->n = ctf_dynhash_elements (fp->ctf_link_inputs);
+
+  if (ctf_dynhash_insert (fp->ctf_link_inputs, dupname, input) < 0)
     goto oom;
 
   return 0;
  oom:
-  free (fp->ctf_link_inputs);
-  fp->ctf_link_inputs = NULL;
+  free (input);
   free (dupname);
-  return (ctf_set_errno (fp, ENOMEM));
+  return ctf_set_errno (fp, ENOMEM);
+}
+
+/* Add a file, memory buffer, or unopened file (by name) to a link.
+
+   You can call this with:
+
+    CTF and NAME: link the passed ctf_archive_t, with the given NAME.
+    NAME alone: open NAME as a CTF file when needed.
+    BUF and NAME: open the BUF (of length N) as CTF, with the given NAME.  (Not
+    yet implemented.)
+
+    Passed in CTF args are owned by the dictionary and will be freed by it.
+    The BUF arg is *not* owned by the dictionary, and the user should not free
+    its referent until the link is done.
+
+    The order of calls to this function influences the order of types in the
+    final link output, but otherwise is not important.
+
+    Private for now, but may in time become public once support for BUF is
+    implemented.  */
+
+static int
+ctf_link_add (ctf_file_t *fp, ctf_archive_t *ctf, const char *name,
+	      void *buf _libctf_unused_, size_t n _libctf_unused_)
+{
+  if (buf)
+    return (ctf_set_errno (fp, ECTF_NOTYET));
+
+  if (!((ctf && name && !buf)
+	|| (name && !buf && !ctf)
+	|| (buf && name && !ctf)))
+    return (ctf_set_errno (fp, EINVAL));
+
+  /* We can only lazily open files if libctf.so is in use rather than
+     libctf-nobfd.so.  This is a little tricky: in shared libraries, we can use
+     a weak symbol so that -lctf -lctf-nobfd works, but in static libraries we
+     must distinguish between the two libraries explicitly.  */
+
+#if defined (PIC)
+  if (!buf && !ctf && name && !ctf_open)
+    return (ctf_set_errno (fp, ECTF_NEEDSBFD));
+#elif NOBFD
+  if (!buf && !ctf && name)
+    return (ctf_set_errno (fp, ECTF_NEEDSBFD));
+#endif
+
+  if (fp->ctf_link_outputs)
+    return (ctf_set_errno (fp, ECTF_LINKADDEDLATE));
+  if (fp->ctf_link_inputs == NULL)
+    fp->ctf_link_inputs = ctf_dynhash_create (ctf_hash_string,
+					      ctf_hash_eq_string, free,
+					      ctf_link_input_close);
+
+  if (fp->ctf_link_inputs == NULL)
+    return (ctf_set_errno (fp, ENOMEM));
+
+  return ctf_link_add_ctf_internal (fp, ctf, NULL, name);
+}
+
+/* Add an opened CTF archive or unopened file (by name) to a link.
+   If CTF is NULL and NAME is non-null, an unopened file is meant:
+   otherwise, the specified archive is assumed to have the given NAME.
+
+    Passed in CTF args are owned by the dictionary and will be freed by it.
+
+    The order of calls to this function influences the order of types in the
+    final link output, but otherwise is not important.  */
+
+int
+ctf_link_add_ctf (ctf_file_t *fp, ctf_archive_t *ctf, const char *name)
+{
+  return ctf_link_add (fp, ctf, name, NULL, 0);
 }
 
 /* Return a per-CU output CTF dictionary suitable for the given CU, creating and
@@ -210,9 +312,9 @@ ctf_create_per_cu (ctf_file_t *fp, const char *filename, const char *cuname)
 
       if ((cu_fp = ctf_create (&err)) == NULL)
 	{
-	  ctf_dprintf ("Cannot create per-CU CTF archive for CU %s from "
-		       "input file %s: %s\n", cuname, filename,
-		       ctf_errmsg (err));
+	  ctf_err_warn (fp, 0, "Cannot create per-CU CTF archive for "
+			"CU %s from input file %s: %s", cuname, filename,
+			ctf_errmsg (err));
 	  ctf_set_errno (fp, err);
 	  return NULL;
 	}
@@ -262,7 +364,8 @@ ctf_link_add_cu_mapping (ctf_file_t *fp, const char *from, const char *to)
   if (fp->ctf_link_outputs == NULL)
     fp->ctf_link_outputs = ctf_dynhash_create (ctf_hash_string,
 					       ctf_hash_eq_string, free,
-					       ctf_file_close_thunk);
+					       (ctf_hash_free_fun)
+					       ctf_file_close);
 
   if (fp->ctf_link_outputs == NULL)
     return ctf_set_errno (fp, ENOMEM);
@@ -310,15 +413,27 @@ ctf_link_set_memb_name_changer (ctf_file_t *fp,
 
 typedef struct ctf_link_in_member_cb_arg
 {
+  /* The shared output dictionary.  */
   ctf_file_t *out_fp;
-  const char *file_name;
+
+  /* The filename of the input file, and an fp to each dictionary in that file
+     in turn.  */
+  const char *in_file_name;
   ctf_file_t *in_fp;
-  ctf_file_t *main_input_fp;
+
+  /* The CU name of the dict being processed.  */
   const char *cu_name;
-  char *arcname;
-  int done_main_member;
-  int share_mode;
   int in_input_cu_file;
+
+  /* The parent dictionary in the input, and whether it's been processed yet.
+     Not needed by ctf_link_one_type / ctf_link_one_variable, only by higher
+     layers.  */
+  ctf_file_t *in_fp_parent;
+  int done_parent;
+
+  /* If true, this is the CU-mapped portion of a deduplicating link: no child
+     dictionaries should be created.  */
+  int cu_mapped;
 } ctf_link_in_member_cb_arg_t;
 
 /* Link one type into the link.  We rely on ctf_add_type() to detect
@@ -332,9 +447,9 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_)
   ctf_file_t *per_cu_out_fp;
   int err;
 
-  if (arg->share_mode != CTF_LINK_SHARE_UNCONFLICTED)
+  if (arg->in_fp->ctf_link_flags != CTF_LINK_SHARE_UNCONFLICTED)
     {
-      ctf_dprintf ("Share-duplicated mode not yet implemented.\n");
+      ctf_err_warn (arg->out_fp, 0, "Share-duplicated mode not yet implemented");
       return ctf_set_errno (arg->out_fp, ECTF_NOTYET);
     }
 
@@ -352,19 +467,18 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_)
       if (err != ECTF_CONFLICT)
 	{
 	  if (err != ECTF_NONREPRESENTABLE)
-	    ctf_dprintf ("Cannot link type %lx from archive member %s, input file %s "
-			 "into output link: %s\n", type, arg->arcname, arg->file_name,
-			 ctf_errmsg (err));
+	    ctf_err_warn (arg->out_fp, 1, "Cannot link type %lx from input file %s, "
+			  "CU %s into output link: %s", type, arg->cu_name,
+			 arg->in_file_name, ctf_errmsg (err));
 	  /* We must ignore this problem or we end up losing future types, then
 	     trying to link the variables in, then exploding.  Better to link as
-	     much as possible.  XXX when we add a proper link warning
-	     infrastructure, we should report the error here!  */
+	     much as possible.  */
 	  return 0;
 	}
       ctf_set_errno (arg->out_fp, 0);
     }
 
-  if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->file_name,
+  if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->in_file_name,
 					  arg->cu_name)) == NULL)
     return -1;					/* Errno is set for us.  */
 
@@ -373,10 +487,10 @@ ctf_link_one_type (ctf_id_t type, int isroot _libctf_unused_, void *arg_)
 
   err = ctf_errno (per_cu_out_fp);
   if (err != ECTF_NONREPRESENTABLE)
-    ctf_dprintf ("Cannot link type %lx from CTF archive member %s, input file %s "
-		 "into output per-CU CTF archive member %s: %s: skipped\n", type,
-		 arg->arcname, arg->file_name, arg->arcname,
-		 ctf_errmsg (err));
+    ctf_err_warn (arg->out_fp, 1, "Cannot link type %lx from input file %s, CU %s "
+		 "into output per-CU CTF archive member %s: %s: skipped", type,
+		 ctf_link_input_name (arg->in_fp), arg->in_file_name,
+		 ctf_link_input_name (per_cu_out_fp), ctf_errmsg (err));
   if (err == ECTF_CONFLICT)
       /* Conflicts are possible at this stage only if a non-ld user has combined
 	 multiple TUs into a single output dictionary.  Even in this case we do not
@@ -402,8 +516,9 @@ check_variable (const char *name, ctf_file_t *fp, ctf_id_t type,
   if (dvd->dvd_type != type)
     {
       /* Variable here.  Wrong type: cannot add.  Just skip it, because there is
-	 no way to express this in CTF.  (This might be the parent, in which
-	 case we'll try adding in the child first, and only then give up.)  */
+	 no way to express this in CTF.  Don't even warn: this case is too
+	 common.  (This might be the parent, in which case we'll try adding in
+	 the child first, and only then give up.)  */
       ctf_dprintf ("Inexpressible duplicate variable %s skipped.\n", name);
     }
 
@@ -448,9 +563,18 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_)
 
   /* Can't add to the parent due to a name clash, or because it references a
      type only present in the child.  Try adding to the child, creating if need
-     be.  */
+     be.  If we can't do that, skip it.  Don't add to a child if we're doing a
+     CU-mapped link, since that has only one output.  */
+
+  if (arg->cu_mapped)
+    {
+      ctf_dprintf ("Variable %s in input file %s depends on a type %lx hidden "
+		   "due to conflicts: skipped.\n", name, arg->in_file_name,
+		   type);
+      return 0;
+    }
 
-  if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->file_name,
+  if ((per_cu_out_fp = ctf_create_per_cu (arg->out_fp, arg->in_file_name,
 					  arg->cu_name)) == NULL)
     return -1;					/* Errno is set for us.  */
 
@@ -462,8 +586,9 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_)
 
       if (dst_type == 0)
 	{
-	  ctf_dprintf ("Type %lx for variable %s in input file %s not "
-		       "found: skipped.\n", type, name, arg->file_name);
+	  ctf_err_warn (arg->out_fp, 1, "Type %lx for variable %s in input "
+			"file %s not found: skipped", type, name,
+			arg->in_file_name);
 	  /* Do not terminate the link: just skip the variable.  */
 	  return 0;
 	}
@@ -475,11 +600,11 @@ ctf_link_one_variable (const char *name, ctf_id_t type, void *arg_)
   return 0;
 }
 
-/* Merge every type and variable in this archive member into the link, so we can
-   relink things that have already had ld run on them.  We use the archive
-   member name, sans any leading '.ctf.', as the CU name for ambiguous types if
-   there is one and it's not the default: otherwise, we use the name of the
-   input file.  */
+/* Merge every type (and optionally, variable) in this archive member into the
+   link, so we can relink things that have already had ld run on them.  We use
+   the archive member name, sans any leading '.ctf.', as the CU name for
+   ambiguous types if there is one and it's not the default: otherwise, we use
+   the name of the input file.  */
 static int
 ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *arg_)
 {
@@ -497,32 +622,16 @@ ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *ar
 	 causes the system to erroneously conclude that all types are duplicated
 	 and should be shared, even if they are not.  */
 
-      if (arg->done_main_member)
+      if (arg->done_parent)
 	return 0;
-      arg->arcname = strdup (".ctf.");
-      if (arg->arcname)
-	{
-	  char *new_name;
-
-	  new_name = ctf_str_append (arg->arcname, arg->file_name);
-	  if (new_name)
-	    arg->arcname = new_name;
-	  else
-	    free (arg->arcname);
-	}
     }
   else
     {
-      arg->arcname = strdup (name);
-
       /* Get ambiguous types from our parent.  */
-      ctf_import (in_fp, arg->main_input_fp);
+      ctf_import (in_fp, arg->in_fp_parent);
       arg->in_input_cu_file = 1;
     }
 
-  if (!arg->arcname)
-    return ctf_set_errno (in_fp, ENOMEM);
-
   arg->cu_name = name;
   if (strncmp (arg->cu_name, ".ctf.", strlen (".ctf.")) == 0)
     arg->cu_name += strlen (".ctf.");
@@ -532,7 +641,6 @@ ctf_link_one_input_archive_member (ctf_file_t *in_fp, const char *name, void *ar
     err = ctf_variable_iter (in_fp, ctf_link_one_variable, arg);
 
   arg->in_input_cu_file = 0;
-  free (arg->arcname);
 
   if (err < 0)
       return -1;				/* Errno is set for us.  */
@@ -551,61 +659,128 @@ empty_link_type_mapping (void *key _libctf_unused_, void *value,
     ctf_dynhash_empty (fp->ctf_link_type_mapping);
 }
 
+/* Lazily open a CTF archive for linking, if not already open.
+
+   Returns the number of files contained within the opened archive (0 for none),
+   or -1 on error, as usual.  */
+static ssize_t
+ctf_link_lazy_open (ctf_file_t *fp, ctf_link_input_t *input)
+{
+  size_t count;
+  int err;
+
+  if (input->clin_arc)
+    return ctf_archive_count (input->clin_arc);
+
+  if (input->clin_fp)
+    return 1;
+
+  /* See ctf_link_add_ctf.  */
+#if defined (PIC) || !NOBFD
+  input->clin_arc = ctf_open (input->clin_filename, NULL, &err);
+#else
+  ctf_err_warn (fp, 0, "Cannot open %s lazily: %s", input->clin_filename,
+		ctf_errmsg (ECTF_NEEDSBFD));
+  ctf_set_errno (fp, ECTF_NEEDSBFD);
+  return -1;
+#endif
+
+  /* Having no CTF sections is not an error.  We just don't need to do
+     anything.  */
+
+  if (!input->clin_arc)
+    {
+      if (err == ECTF_NOCTFDATA)
+	return 0;
+
+      ctf_err_warn (fp, 0, "Opening CTF %s failed: %s",
+		    input->clin_filename, ctf_errmsg (err));
+      ctf_set_errno (fp, err);
+      return -1;
+    }
+
+  if ((count = ctf_archive_count (input->clin_arc)) == 0)
+    ctf_arc_close (input->clin_arc);
+
+  return (ssize_t) count;
+}
+
+/* Close an input, as a ctf_dynhash_iter iterator.  */
+static void
+ctf_link_close_one_input_archive (void *key _libctf_unused_, void *value,
+				  void *arg _libctf_unused_)
+{
+  ctf_link_input_t *input = (ctf_link_input_t *) value;
+  if (input->clin_arc)
+    ctf_arc_close (input->clin_arc);
+  input->clin_arc = NULL;
+}
+
 /* Link one input file's types into the output file.  */
 static void
 ctf_link_one_input_archive (void *key, void *value, void *arg_)
 {
   const char *file_name = (const char *) key;
-  ctf_archive_t *arc = (ctf_archive_t *) value;
+  ctf_link_input_t *input = (ctf_link_input_t *)value;
   ctf_link_in_member_cb_arg_t *arg = (ctf_link_in_member_cb_arg_t *) arg_;
-  int err;
+  int err = 0;
+
+  if (!input->clin_arc)
+    {
+      err = ctf_link_lazy_open (arg->out_fp, input);
+      if (err == 0)				/* Just no CTF.  */
+	return;
+
+      if (err < 0)
+	return;					/* errno is set for us.  */
+    }
 
-  arg->file_name = file_name;
-  arg->done_main_member = 0;
-  if ((arg->main_input_fp = ctf_arc_open_by_name (arc, NULL, &err)) == NULL)
+  arg->in_file_name = file_name;
+  arg->done_parent = 0;
+  if ((arg->in_fp_parent = ctf_arc_open_by_name (input->clin_arc, NULL,
+						 &err)) == NULL)
     if (err != ECTF_ARNNAME)
       {
-	ctf_dprintf ("Cannot open main archive member in input file %s in the "
-		     "link: skipping: %s.\n", arg->file_name,
-		     ctf_errmsg (err));
-	return;
+	ctf_err_warn (arg->out_fp, 0, "Cannot open main archive member in "
+		      "input file %s in the link: skipping: %s",
+		      arg->in_file_name, ctf_errmsg (err));
+	goto out;
       }
 
-  if (ctf_link_one_input_archive_member (arg->main_input_fp,
+  if (ctf_link_one_input_archive_member (arg->in_fp_parent,
 					 _CTF_SECTION, arg) < 0)
     {
-      ctf_file_close (arg->main_input_fp);
-      return;
+      ctf_file_close (arg->in_fp_parent);
+      goto out;
     }
-  arg->done_main_member = 1;
-  if (ctf_archive_iter (arc, ctf_link_one_input_archive_member, arg) < 0)
-    ctf_dprintf ("Cannot traverse archive in input file %s: link "
-		 "cannot continue: %s.\n", arg->file_name,
-		 ctf_errmsg (ctf_errno (arg->out_fp)));
+  arg->done_parent = 1;
+  if (ctf_archive_iter (input->clin_arc, ctf_link_one_input_archive_member,
+			arg) < 0)
+    ctf_err_warn (arg->out_fp, 0, "Cannot traverse archive in input file %s: "
+		  "link cannot continue: %s", arg->in_file_name,
+		  ctf_errmsg (ctf_errno (arg->out_fp)));
   else
     {
       /* The only error indication to the caller is the errno: so ensure that it
 	 is zero if there was no actual error from the caller.  */
       ctf_set_errno (arg->out_fp, 0);
     }
-  ctf_file_close (arg->main_input_fp);
+  ctf_file_close (arg->in_fp_parent);
 
-  /* Discard the now-unnecessary mapping table data.  */
-  if (arg->out_fp->ctf_link_type_mapping)
-    ctf_dynhash_empty (arg->out_fp->ctf_link_type_mapping);
-  ctf_dynhash_iter (arg->out_fp->ctf_link_outputs, empty_link_type_mapping, NULL);
+ out:
+  ctf_link_close_one_input_archive (key, value, NULL);
 }
 
 /* Merge types and variable sections in all files added to the link
-   together.  */
+   together.  All the added files are closed.  */
 int
-ctf_link (ctf_file_t *fp, int share_mode)
+ctf_link (ctf_file_t *fp, int flags)
 {
   ctf_link_in_member_cb_arg_t arg;
 
   memset (&arg, 0, sizeof (struct ctf_link_in_member_cb_arg));
   arg.out_fp = fp;
-  arg.share_mode = share_mode;
+  fp->ctf_link_flags = flags;
 
   if (fp->ctf_link_inputs == NULL)
     return 0;					/* Nothing to do. */
@@ -613,7 +788,8 @@ ctf_link (ctf_file_t *fp, int share_mode)
   if (fp->ctf_link_outputs == NULL)
     fp->ctf_link_outputs = ctf_dynhash_create (ctf_hash_string,
 					       ctf_hash_eq_string, free,
-					       ctf_file_close_thunk);
+					       (ctf_hash_free_fun)
+					       ctf_file_close);
 
   if (fp->ctf_link_outputs == NULL)
     return ctf_set_errno (fp, ENOMEM);
@@ -621,7 +797,12 @@ ctf_link (ctf_file_t *fp, int share_mode)
   ctf_dynhash_iter (fp->ctf_link_inputs, ctf_link_one_input_archive,
 		    &arg);
 
-  if (ctf_errno (fp) != 0)
+  /* Discard the now-unnecessary mapping table data from all the outputs.  */
+  if (fp->ctf_link_type_mapping)
+    ctf_dynhash_empty (fp->ctf_link_type_mapping);
+  ctf_dynhash_iter (fp->ctf_link_outputs, empty_link_type_mapping, NULL);
+
+  if ((ctf_errno (fp) != 0) && (ctf_errno (fp) != ECTF_NOCTFDATA))
     return -1;
   return 0;
 }
@@ -908,7 +1089,7 @@ ctf_link_write (ctf_file_t *fp, size_t *size, size_t threshold)
 	free (arg.dynames[i]);
       free (arg.dynames);
     }
-  ctf_dprintf ("Cannot write archive in link: %s failure: %s\n", errloc,
-	       ctf_errmsg (ctf_errno (fp)));
+  ctf_err_warn (fp, 0, "Cannot write archive in link: %s failure: %s", errloc,
+		ctf_errmsg (ctf_errno (fp)));
   return NULL;
 }
diff --git a/libctf/libctf.ver b/libctf/libctf.ver
index f1c9b2b..7eed14a 100644
--- a/libctf/libctf.ver
+++ b/libctf/libctf.ver
@@ -156,8 +156,6 @@ LIBCTF_1.0 {
 	ctf_getdebug;
 	ctf_errwarning_next;
 
-	/* Not yet part of the stable API.  */
-
 	ctf_link_add_ctf;
 	ctf_link_add_cu_mapping;
 	ctf_link_set_memb_name_changer;