m68k: fix math in libroot

Change-Id: Icd50c5887d1b96818c620046b20ba51aac55ec18
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2212
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

libroot: Replace most of libm with musl's.

The glibc libm code was showing its age, and has recently been
the subject of a number of tickets about its inaccuracy.
Additionally, some developers have complained about
how convoluted the headers are, and thus how hard it is
to add support for new architectures (and how flaky
the support for the existing architectures is.)

So, with this commit, nearly the entire glibc libm has been
gutted and replaced with the one from musl 1.1.24.

The complex functions from glibc are retained (as they
are more mature than musl's), as are some glibc-internal
libm functions.

This also has the advantage that these functions are
actually using our <math.h>, whereas GCC used its own,
which was rather dangerous for obvious reasons.

Additionally, the new math functions are always compiled
with GCC 8 (even on x86_gcc2), as it seems GCC 2 does
not quite understand some of the union-aliasing they
use (a lot of which was added in C99, I suppose.)
FFmpeg on x86_gcc2 is already compiled with GCC 8
and that has so far worked out well, so there should
not be any problems caused by this.

I did verify that ARM and PPC at least still compile,
though other architectures may require a bit more work
(they are not bootstrapped so I could not do much.)

Should fix #14933 among other issues.

Change-Id: Ifeea0ddab23a8d0480fc26dece1b0192afc263bd

glibc: cleanup long double support

- Add 128 bit long double support from current glibc and a few headers
they need
- Move the existing 80 bit float support in a sub directory of generic,
it is not universal to all archs (see file added in docs/develop/arch).
Also include some new .h files for x86 that are needed after these
changes (from newer versions of the glibc).
- Adjust Jamfiles for m68k, x86 and x86_64 to use the 80bit format
- Do not adjust arm jamfiles, it was wrongly using 80bit long double and
should be fixed to use 64bit instead (which means the double functions
can be used with aliases)
- Do not adjust powerpc jamfiles, because it uses yet another format and
we build it without long double support anyways.

Note that I moved only the files that were creating compile errors,
quite likely more of the s_* and e_* files need to be moved to the
specific directories, see glibc list here:

https://sourceware.org/git/?p=glibc.git;a=tree;f=sysdeps/ieee754/ldbl-128
https://sourceware.org/git/?p=glibc.git;a=tree;f=sysdeps/ieee754/ldbl-96

Change-Id: Ic2d8a454ba9a3b99638e4fbb63daf02df0fea403
Reviewed-on: https://review.haiku-os.org/c/1143
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

M68K: drop dupplicate strlen

Seems we have our own now.

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).

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

added fmin, fma, fmax from glibc (ticket #5114).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34652 a95241bf-73f2-0310-859d-f6bbb57e9c96

added lrint and llrint functions to math.h
added generic implementations for ppc and m68k


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30945 a95241bf-73f2-0310-859d-f6bbb57e9c96

added nexttoward()


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27349 a95241bf-73f2-0310-859d-f6bbb57e9c96

added more posix functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27348 a95241bf-73f2-0310-859d-f6bbb57e9c96

I forgot that m68k build doesn't include long double versions of functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27307 a95241bf-73f2-0310-859d-f6bbb57e9c96

added fpclassifyl


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27272 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add missing s_fabs* from glibc-2.3.5.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26102 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add memrchr for ppc and m68k too. Please don't forget other archs when adding stuff :P


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25156 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add *rint*() from glibc 2.3.5.
This make app_server link \o/


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23651 a95241bf-73f2-0310-859d-f6bbb57e9c96

added missing m68k bits for math functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23648 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

Start of math support from glibc.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22701 a95241bf-73f2-0310-859d-f6bbb57e9c96

M68K: drop dupplicate strlen

Seems we have our own now.

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).

Introduce __set_errno() throughout libroot.

* add errno_private.h, which defines the __set_errno() macro with
and without tracing
* instead of setting errno manually, all libroot's code now invokes
__set_errno(), which makes it much easier to trace changes to errno
* redirect glibc's use of __set_errno() to our own version

added fmin, fma, fmax from glibc (ticket #5114).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34652 a95241bf-73f2-0310-859d-f6bbb57e9c96

added lrint and llrint functions to math.h
added generic implementations for ppc and m68k


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30945 a95241bf-73f2-0310-859d-f6bbb57e9c96

added nexttoward()


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27349 a95241bf-73f2-0310-859d-f6bbb57e9c96

added more posix functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27348 a95241bf-73f2-0310-859d-f6bbb57e9c96

I forgot that m68k build doesn't include long double versions of functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27307 a95241bf-73f2-0310-859d-f6bbb57e9c96

added fpclassifyl


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@27272 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add missing s_fabs* from glibc-2.3.5.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26102 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add memrchr for ppc and m68k too. Please don't forget other archs when adding stuff :P


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25156 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add *rint*() from glibc 2.3.5.
This make app_server link \o/


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23651 a95241bf-73f2-0310-859d-f6bbb57e9c96

added missing m68k bits for math functions


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23648 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

Start of math support from glibc.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22701 a95241bf-73f2-0310-859d-f6bbb57e9c96