Work on swapped-endian FFS.

remove GCC_NO_ADDR_OF_PACKED_MEMBER for several subdir builds
that are now handled by lfs_accessors.h internally.

add support for new GCC 9 warnings that may be too much to fix
right now. new address-of-packed-member and format-overflow
warnings have new GCC_NO_ADDR_OF_PACKED_MEMBER amd
GCC_NO_FORMAT_OVERFLOW variables to remove these warnings.

apply to a bunch of the tree. mostly, these are real bugs that
should be fixed, but in many cases, only by removing the 'packed'
attribute from some structure that doesn't really need it. (i
looked at many different ones, and while perhaps 60-80% were
already properly aligned, it wasn't clear to me that the uses
were always coming from sane data vs network alignment, so it
doesn't seem safe to remove packed without careful research for
each affect struct.) clang already warned (and was not erroring)
for many of these cases, but gcc picked up dozens more.

Add a "-b" option to search a partition for valid alternate superblocks,
rather than searching the disk for partitions. Also, test LFS superblock
checksums before we report them.

branches: 1.7.4;
Specify the scan_ffs manpage, otherwise it will use scan_ffs.1.

Fold scan_lfs.8 into scan_ffs.8. It's the same program, after all.
Ok'd by xtraeme.

Add scan_lfs(8), utility to find LFS partitions on disk, useful
to recover lost disklabels.

Move WARNS=3 to the Makefile.inc, and add a little const to the remaining
programs that did not compile before.

WARNS=4, misc cleanups.
- void casts
- remove unused notreached
- use a loop instead of code duplication
- use switches and #define constants

No need to define SRCS here.

Add scan_ffs(8) from OpenBSD, it was modified to support FFSv2
for NetBSD (with different blocksizes). Utility to find
FFSv1 and FFSv2 partitions on disks, useful to recover lost
disklabels.

Reviewed by christos.

remove GCC_NO_ADDR_OF_PACKED_MEMBER for several subdir builds
that are now handled by lfs_accessors.h internally.

add support for new GCC 9 warnings that may be too much to fix
right now. new address-of-packed-member and format-overflow
warnings have new GCC_NO_ADDR_OF_PACKED_MEMBER amd
GCC_NO_FORMAT_OVERFLOW variables to remove these warnings.

apply to a bunch of the tree. mostly, these are real bugs that
should be fixed, but in many cases, only by removing the 'packed'
attribute from some structure that doesn't really need it. (i
looked at many different ones, and while perhaps 60-80% were
already properly aligned, it wasn't clear to me that the uses
were always coming from sane data vs network alignment, so it
doesn't seem safe to remove packed without careful research for
each affect struct.) clang already warned (and was not erroring)
for many of these cases, but gcc picked up dozens more.

Add a "-b" option to search a partition for valid alternate superblocks,
rather than searching the disk for partitions. Also, test LFS superblock
checksums before we report them.

branches: 1.7.4;
Specify the scan_ffs manpage, otherwise it will use scan_ffs.1.

Fold scan_lfs.8 into scan_ffs.8. It's the same program, after all.
Ok'd by xtraeme.

Add scan_lfs(8), utility to find LFS partitions on disk, useful
to recover lost disklabels.

Move WARNS=3 to the Makefile.inc, and add a little const to the remaining
programs that did not compile before.

WARNS=4, misc cleanups.
- void casts
- remove unused notreached
- use a loop instead of code duplication
- use switches and #define constants

No need to define SRCS here.

Add scan_ffs(8) from OpenBSD, it was modified to support FFSv2
for NetBSD (with different blocksizes). Utility to find
FFSv1 and FFSv2 partitions on disks, useful to recover lost
disklabels.

Reviewed by christos.