For the benefit of lualoader, add all bootenvs to environment when
init_zfs_bootenv is invoked. All of the boot environment logic can then be
implemented in pure lua, rather than going back and forth with C to
implement paging.
This stores all boot environments in bootenvs[idx] and the final count of
bootenvs in bootenvs_count.
While here, make a copy of currdev for init_zfs_bootenv since it will be
modifying it and the caller may not necessarily want that. Some of the logic
was shifted around so that the 'currdev' pointer remains at the beginning of
the string and 'beroot' is moved around as needed to modify it or ultimately
store it in zfs_be_root.
The original zfs_bootenv that this was copied from will be able to go away
only if/when forth eventually goes away.
Tested with: lualoader (and local changes to add boot env. support)
Tested with: forth
Reviewed by: cem (earlier version), imp
Differential Revision: https://reviews.freebsd.org/D14435
OK. We don't really need a bsd.stand.mk, and it was causing a -fPIC
for the toolchain to be added (bogusly) when building on amd64. Pull
all relevant defs back into defs.mk and delete bsd.stand.mk.
This saves about 15-20k on i386 loader and zfsloader which when
combined with Lua give us a lot more stack space in those constrained
environments.
MK_CTF, MK_SSP, MK_PROFILE, NO_PIC, and INTERNALLIB are always the
same, so set them in defs.mk. MAN= is common, so set it here too.
This removes a lot of boring repetition from the Makefiles that added
almost no value.
Default WARNS to 0 still, since there's still some warnings on other
architectures.
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D13301
