For compatibility with isohybrid.pl, use getopt_long_only() so long
options are accepted with a single dash.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Some Linux distributions have complained about Perl as a prerequisite
for isohybrid, so create a C version.

[ hpa: modified the array generator to put it all in one script ]

It is often fine to have a sparse file for the output image, so add an
-s option to generate a sparse image.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Replace -W -Wall hardcoded into a bunch of Makefiles with $(GCCWARN),
a centralized variable defined in the root MCONFIG.  Add
-Wstrict-prototypes to the list of global warnings: we should never
have non-prototyped declarations.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Actually implement the -offset option.  Credit for the patch goes to
"cmdr from the gparted-forum", reported by
Sven-Hendrik Haase <sh@lutzhaase.com>.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Make sure the pxelinux-options script gets installed.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add help text to pxelinux-options.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Support hardcoded DHCP options both "before" or "after" the
PXE-provided options.

Add a tool to manipulate these hardcoded options.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Shouldn't 'isohybrid -id ID' write ID as 32bit number? Currently it ends up
as string messing up the mbr.

Unlike C, in Perl printf() doesn't return the number of bytes written.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>