m68k: really add fenv from musl-1.1.24

Somehow the first review merged only the commit log.

FreeBSD doesn't have m68k anyway, so use fenv from musl with as less
changes as possible.

Change-Id: I6372af6679e6773fbb6bf4c8b5b30512971a97a6
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3161
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

m68k: simplify a Jamfile.

I'm copypasting a lot from this, so I may as well clean it up while I'm
at it.

Change-Id: I9288c087abbf95475f980b5539f2fd19fad7f775
Reviewed-on: https://review.haiku-os.org/c/1136
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

More work towards hybrid support

* All packaging architecture dependent variables do now have a
respective suffix and are set up for each configured packaging
architecture, save for the kernel and boot loader variables, which
are still only set up for the primary architecture.
For convenience TARGET_PACKAGING_ARCH, TARGET_ARCH, TARGET_LIBSUPC++,
and TARGET_LIBSTDC++ are set to the respective values for the primary
packaging architecture by default.
* Introduce a set of MultiArch* rules to help with building targets for
multiple packaging architectures. Generally the respective targets are
(additionally) gristed with the packaging architecture. For libraries
the additional grist is usually omitted for the primary architecture
(e.g. libroot.so and <x86>libroot.so for x86_gcc2/x86 hybrid), so that
Jamfiles for targets built only for the primary architecture don't
need to be changed.
* Add multi-arch build support for all targets needed for the stage 1
cross devel package as well as for libbe (untested).

- use asm_def.h and FUNCTION_END
- remove some dead ppc code


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28023 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved setjmp() to sigsetjmp.S for ppc and m68k, too. Should fix the
kernel build. Haven't tested it though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25431 a95241bf-73f2-0310-859d-f6bbb57e9c96

More of the libc...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22738 a95241bf-73f2-0310-859d-f6bbb57e9c96

More work towards hybrid support

* All packaging architecture dependent variables do now have a
respective suffix and are set up for each configured packaging
architecture, save for the kernel and boot loader variables, which
are still only set up for the primary architecture.
For convenience TARGET_PACKAGING_ARCH, TARGET_ARCH, TARGET_LIBSUPC++,
and TARGET_LIBSTDC++ are set to the respective values for the primary
packaging architecture by default.
* Introduce a set of MultiArch* rules to help with building targets for
multiple packaging architectures. Generally the respective targets are
(additionally) gristed with the packaging architecture. For libraries
the additional grist is usually omitted for the primary architecture
(e.g. libroot.so and <x86>libroot.so for x86_gcc2/x86 hybrid), so that
Jamfiles for targets built only for the primary architecture don't
need to be changed.
* Add multi-arch build support for all targets needed for the stage 1
cross devel package as well as for libbe (untested).

- use asm_def.h and FUNCTION_END
- remove some dead ppc code


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28023 a95241bf-73f2-0310-859d-f6bbb57e9c96

Moved setjmp() to sigsetjmp.S for ppc and m68k, too. Should fix the
kernel build. Haven't tested it though.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25431 a95241bf-73f2-0310-859d-f6bbb57e9c96

More of the libc...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22738 a95241bf-73f2-0310-859d-f6bbb57e9c96