Imported NetBSD's ld for shared libs.

Merge from head at r201628.

# This hasn't been tested, and there are at least three bad commits
# that need to be backed out before the branch will be stable again.

ANSIfy ldconfig and the aout bits it still uses from rtld-aout.

(Why is aout support still there?)

Remove unused reference to objformat.h

Document -32 flag in usage() output as well.

Requested by: ru
MFC after: 1 week

Sync program's usage() with manpage's SYNOPSIS.

Improve readability for the recently introduced changes by having
their sizeof(*p) instead of explicitlly specifying their types.

Suggested by: nectar

Use a better name than underscore-tmpfile for better representation
of the meaning.

Suggested by: stefanf

64-bit clean + WARNS=6:
- Convert the (char *) cast+cast backs magic to
memcpy(3). Without this, the resulting code
is potentially risky with higher optimization
levels.
- Avoid same name

64-bit clean + WARNS=6:
- Convert the (char *) cast+cast backs magic to
memcpy(3). Without this, the resulting code
is potentially risky with higher optimization
levels.
- Avoid same name when calling local variables,
as well as global symbols. This reduces
confusion for both human and compiler.
- Add necessary casts, consts
- Use new style function defination.
- Minor style.Makefile(5) tweak
- Bump WARNS?= from 0 to 6

** for the aout code: changes are intentionally limited
to ease maintaince.

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Avoid using void pointers in additive expressions.

PR: 56653

Add initial support for compiling a special 32 bit version of
ld-elf.so.1 on 64 bit systems. Most of this involves using alternate
paths, environment variables and diagnostic messages.

The build gl

Add initial support for compiling a special 32 bit version of
ld-elf.so.1 on 64 bit systems. Most of this involves using alternate
paths, environment variables and diagnostic messages.

The build glue is seperate.

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Fix 10 year old size-of-bcopy bug.

PR: bin/43930
Submitted by: Alan Barrett
Approved by: rwatson (mentor)
MFNetBSD: revision 1.35
MFC after: 3 days

Initiate deorbit burn for the i386-only a.out related support. Moves are
under way to move the remnants of the a.out toolchain to ports. As the
comment in src/Makefile said, this stuff is deprecate

Initiate deorbit burn for the i386-only a.out related support. Moves are
under way to move the remnants of the a.out toolchain to ports. As the
comment in src/Makefile said, this stuff is deprecated and one should not
expect this to remain beyond 4.0-REL. It has already lasted WAY beyond
that.

Notable exceptions:
gcc - I have not touched the a.out generation stuff there.
ldd/ldconfig - still have some code to interface with a.out rtld.
old as/ld/etc - I have not removed these yet, pending their move to ports.
some includes - necessary for ldd/ldconfig for now.

Tested on: i386 (extensively), alpha

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o __P removed
o main prototype removed

Remove 'register' keyword.
It does not help modern compilers, and some may take some hit from it.
(I also found several functions that listed *every* of its 10 local vars with
"register" -- just how

Remove 'register' keyword.
It does not help modern compilers, and some may take some hit from it.
(I also found several functions that listed *every* of its 10 local vars with
"register" -- just how many free registers do people think machines have?)

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* include/elf.h has been repo copied to include/elf-hints.h, and it no
longer includes machine/elf.h.
* consumers of elf.h now use the minimalist elf header possible.

This change is motivated by B

* include/elf.h has been repo copied to include/elf-hints.h, and it no
longer includes machine/elf.h.
* consumers of elf.h now use the minimalist elf header possible.

This change is motivated by Binutils 2.11.0 and too much clashing over
our base elf headers and the Binutils elf headers.

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Add a "-i" option ("insecure") which disables the checks for
root ownership, etc. I will soon commit a companion knob for
"/etc/rc.conf".

Submitted by: Maxime Henrion <mhenrion@cybercable.fr>

If a directory is world-writable or is not owned by root, skip it
and emit a warning. This is a security measure since ldconfig
influences the shared libraries used by all programs.

I think the che

If a directory is world-writable or is not owned by root, skip it
and emit a warning. This is a security measure since ldconfig
influences the shared libraries used by all programs.

I think the check should be made even more stringent by also
ignoring group-writable directories. I will make that change soon
unless we encounter a good reason not to do it.

Submitted by: Maxime Henrion <mhenrion@cybercable.fr>

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Make "ldconfig" with no arguments behave the same as "ldconfig -R".

Submitted by: Maxime Henrion <mhenrion@cybercable.fr>

Fix insecure tempfile handling

Reviewed by: audit@freebsd.org

$Id$ -> $FreeBSD$

Make usage() reflect reality (add the -aout and -elf options).

OK'd by: bde

Add a new library function getobjformat(). It checks all the
standard places ("/etc/objformat", ${OBJFORMAT}, argv) for an
indication of the user's preferred object file format. This
consolidates s

Add a new library function getobjformat(). It checks all the
standard places ("/etc/objformat", ${OBJFORMAT}, argv) for an
indication of the user's preferred object file format. This
consolidates some code that was starting to be duplicated in more
and more places.

Use the new function in ldconfig.

Note: I don't think that gcc should use getobjformat(), even though
it could. The compiler should limit itself to functions that are
widespread, to ease porting and cross-compilation.

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Fix calls to mmap. It returns void *, and on failure it returns
MAP_FAILED.

Don't try to extend the mapping in place if it is too short.
There's no guarantee it will be possible. Remap the file in

Fix calls to mmap. It returns void *, and on failure it returns
MAP_FAILED.

Don't try to extend the mapping in place if it is too short.
There's no guarantee it will be possible. Remap the file instead.

Put in a few style fixes.

Submitted by: Bruce Evans <bde>

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For a.out mode, ignore shared libraries that don't have at least 2
version numbers.