- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

I'm happy to finally commit stephen@'s implementations of cacos,
cacosh, casin, casinh, catan, and catanh. Thanks to stephen@ and bde@
for working on these.

Submitted by: stephen@
Reviewed by: bde

Add C11 macros CMPLX(), CMPLXF() and CMPLXL().

Clang allows us to initialize complex numbers using an array
initializer, casted to a complex type. GCC has a builtin called
__builtin_complex().

Only use the static assertion when __generic is available.

Reported by: tijl

Remove redundant inclusion of <sys/cdefs.h>.

Mea culpa.

Make _Complex_I a proper float _Complex when using GCC 4.2.

It turns out our GCC has quite an interesting bug:

typeof(1.0fi) != float _Complex
typeof((float _Complex)1.0fi) != float _Complex
typeof((float _Complex)1.0i) == float _Complex

In other words: if casting to an equal size, GCC seems to take a
shortcut. By casting down from a double to a float, GCC doesn't take
this shortcut, yielding the proper type.

To prevent foot-shooting, add a _Static_assert() to guarantee that
_Complex_I is always a float _Complex. I'm not going to MFC this part of
the diff.

MFC after: 2 weeks

Add c{cos,sin,tan}{,h}{,f} functions. This is joint work with
bde and kargl.

Add missing declarations that I intended to commit with r219359.
Not sure why we have math.h in lib/msun/ and complex.h in include/.

Implement cproj{,f,l}().

Annotate creal(), cimag(), and conj() with __pure2.

Implement csqrtl().

Hook hypotl() and cabsl() up to the build.

Implement and document csqrt(3) and csqrtf(3).

Implement carg(3) and cargf(3).

Rotting in an old src tree since: March 2005

Stop defining '_Complex' in a C99 environment, it is supposed to be a keyword.

Use tabulators after '#define'.

Add implementations for cimag{,f,l}, creal{,f,l} and conj{,f,l}. They are
needed for cases where GCC's builtin functions cannot be used and for
compilers that don't know about them.

Approved by: das (mentor)

Remove the macros for creal{,f} and cimag{,f}. They failed to convert their
arguments to the needed type and so the result type depended on the argument
type. Fixing them isn't really worth the effort because GCC emits the same
assembler code with or without them.

Not minded by: ru
Approved by: das (mentor)

Breath deep and take __P out of the system include files.

# This appears to not break X11, but I'm having problems compiling the
# glide part of the server with or without this patch, so I can't tell
# for sure.

Added skeleton <complex.h> (aligned with the POSIX.1-200x), mostly
to fix the "-nostdinc WARNS=X" breakage caused by broken prototypes
for cabs() and cabsl() in <math.h>.

Reimplemented cabs() and cabsl() using new complex numbers types and
moved prototypes from <math.h> to <complex.h>.