Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

/* -> /*- for license, minor formatting changes

Repo copy link.h to sys/link_elf.h and sys/link_aout.h since they are
shared with the kernel. This should make it easier to #include them both
at once as well as stop grabbing stuff from /usr/include.

Breath deep and take __P out of the system include files.

# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.

style(9) the structure definitions.

Update the prototype for "r_brk" to correspond with the change in
"src/libexec/rtld-elf/rtld.c" revision 1.48. This eliminates a
warning when building the dynamic linker, and it doesn't seem to
hurt anything else.

$Id$ -> $FreeBSD$

Add GDB support for ELF shared libs.

Implement dladdr.

Move nlist related defines from link.h into nlist.h. Clean up
nlist.h.

Remove the prototypes for dlopen and related functions. They don't
belong here. The standard place for them is <dlfcn.h>, and there is
already another copy of the prototypes there.

const correctness for dl*()

Implement dlsym(RTLD_NEXT, symbol).

Back out all of yesterdays include file changes.

Make a lot of include-files self-contained. I excluded the patches changing
int's to gid_t and uid_t - should I commit these, too?

Closes PR misc/2625.

Submitted by: Julian Assange <proff@iq.org>

Revert $FreeBSD$ to $Id$

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Fixed the wrong include file for a "prototype mismatch" error between
dlfcn.h and link.h

dlfcn.h and link.h have conflicting declarations for dlopen/dlsym,
with dlfcn.h declaring them as:

void *dlopen __P((const char *, int));
void *dlsym __P((void *, const char *));

while link.h declared them as

extern void *dlopen __P((char *, int));
extern void *dlsym __P((void *, char *));

Fix link.h to match dlfcn.h

Add support for storing a -R path in ld in the section dispatch table,
support LD_HINTS_VERSION_2 that has the ldconfig pathname stored in the
ld.so.hints file (ie: a new library can be installed and used without
needing to run ldconfig -m first)

Reviewed by: nate, jdp
Obtained from: NetBSD (mostly)

Fix a bunch of spelling errors in the comment fields
of a bunch of system include files.

Change ld.so to correctly load dependant libraries for dlopen and unload them
on dlclose. Also correctly call constructors and destructors for libraries
linked with /usr/lib/c++rt0.o.
Change interpretation of dlopen manpage to call _init() rather than init()
for dlopened objects.
Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to
call destructors when an object is unloaded.
Change interface between crt0 and ld.so to allow crt0 to call a function on
exit to call destructors for shared libraries explicitly.

These changes are backwards compatible. Old binaries will work with the new
ld.so and new binaries will work with the old ld.so. A version number has
been introduced in the crt0-ld.so interface to allow for future changes.

Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>

Weak symbol support from NetBSD. This should bring us in sync with the
NetBSD ld code except for local changes for dlopen() and friends and
the hashing on the minor value of the shlibs. We should be binary
compatible now with all their libraries.

Obtained from: NetBSD

Support for more Sun compatible dlopen() and friends. Also added proper error
handling.
Reviewed by: gj
Submitted by: Mark Diekhans <markd@grizzly.com>

This is the new link.h from Paul K. Keeping history is even probably a bad
idea considering the old version (but I haven't time for attic surgery - this
is just a caution). This is part of (and the major reason for) the new ld
changes.

Added link.h for shared libs.