- Don't define llabs(). This breaks if llabs() is already a macro, which
is allowed by the C standard/POSIX. llabs() was introduced in C99, so
I think we can safely assume it is present on all interesting systems.
- Cast the parameters to fabs() to the floating point type. Clang has
introduced some interesting warnings that trigger if the arguments to
fabs*() are not the right type.
This is a bit more consistent with the naming of the other header files
(openlibm_complex.h and openlibm_fenv.h). Re-add an openlibm.h header
that includes all of the public headers as a shorthand.
Fix up all of the source files to include <openlibm_math.h> instead of
<openlibm.h>. While there, fix ordering of the includes.
OpenLibm has an implementation of fenv.h internally. This may be
problematic in case you want it to build against the host system's
implementation, as it would require you to somehow take the fenv.h file
out of the compiler search path.
Simply use a different naming scheme, similar to openlibm.h and
openlibm_complex.h. If we want to build against the host's fenv.h, we
can simply add an '#include <fenv.h>' from within this header.
