Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC r249687, r249704, r250511:

r249687, r249704:

Sync gcore(1) with the recent changes in kernel code aimed at adding
procstat notes to a process core file.

Suggested by: jhb

r250511 (antoine):

Add some missing DPADD.

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Fixed dependencies (make checkdpadd).

Build usr.bin/ with WARNS=6 by default.

Also add some missing $FreeBSD$ to keep svn happy.

Change gcore in order to get rid of the procfs accesses and use FreeBSD's
specific sysctls and ptrace interfaces.
This change switches a bit gcore POLA that is summarized here:
- now gcore can recognize threads within the process and handle dumps
on thread-scope
- the process to be analyzed will be stopped during its gcore run
- gcore may not work with processes which are actively being analyzed
by gdb or truss
- the ptrace interface may cause syscalls to return EINTR, thus
interferring with signals handling within the process

Side note: <janitor task> the interface can be further lifted in order to
get rid of the very last procfs interfaces remnants and made more
suitable for copying with sysctl/ptrace interface </janitor task>.

Obtained from: Sandvine Incorporated
Reviewed by: emaste, rwatson
Sponsored by: Sandvine Incorporated
MFC: 1 month

Remove a.out support from gcore(1).

Use a crowbar to move the a.out code out of gcore.c and into its own
file so that we have a chance of using gcore on non-i386 platforms. Use
linker sets to reduce the registration glue. Remove md-sparc.c, we do not
have an a.out sparc32 port. aoutcore.c was repocopied from gcore.c.

Don't use gcc specific flags.

${MACHINE} -> ${MACHINE_ARCH}

All Makefiles now use MACHINE_ARCH for the target architecture.
Unification is required for cross-building.

Tags added to:
sys/boot/Makefile
sys/boot/arc/loader/Makefile
sys/kern/Makefile
usr.bin/cpp/Makefile
usr.bin/gcore/Makefile
usr.bin/truss/Makefile

usr.bin/gcore/Makefile:
fixed typo: MACHINDE -> MACHINE_ARCH

Make gcore work for ELF.

Remove trailing whitespace.

Add dependencies on libraries to DPADD. Someday this should be done
automagically. -lfoo has to be right to work, but ${LIBFO0} is too
easy to forget or misspell; nothing checks it and it should be
different for shared libraries.

Corrected to work without symbolic links for md-${MACHINE}.c.

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

BSD 4.4 Lite Usr.bin Sources