Replace our ancient dtoa/strtod implementation with the gdtoa

package, a more recent, generalized set of routines.  Among the
changes:
- Declare strtof() and strtold() in stdlib.h.
- Add glue to libc to support these routines for all kinds
  of ``long double''.
- Update printf() to reflect the fact that dtoa works slightly
  differently now.

As soon as I see that nothing has blown up, I will kill
src/lib/libc/stdlib/strtod.c.  Soon printf() will be able
to use the new routines to output long doubles without loss
of precision, but numerous bugs in the existing code must
be addressed first.

Reviewed by:	bde (briefly), mike (mentor), obrien

1 files changed, 16 insertions, 0 deletions

diff --git a/lib/libc/gdtoa/Makefile.inc b/lib/libc/gdtoa/Makefile.inc
new file mode 100644
index 000000000000..c2c58e119473
--- /dev/null
+++ b/lib/libc/gdtoa/Makefile.inc
@@ -0,0 +1,16 @@
+# $FreeBSD$
+
+CFLAGS+=-I${.CURDIR}/../../contrib/gdtoa
+MISRCS+=glue.c
+GDTOASRCS=dmisc.c dtoa.c gdtoa.c gethex.c gmisc.c \
+	hd_init.c hexnan.c misc.c smisc.c \
+	strtoIg.c strtod.c strtodg.c strtof.c strtord.c sum.c ulp.c
+.if exists(${.CURDIR}/${MACHINE_ARCH}/stdlib/gdtoa.mk)
+.include "${.CURDIR}/${MACHINE_ARCH}/stdlib/gdtoa.mk"
+.endif
+.for src in ${GDTOASRCS}
+MISRCS+=gdtoa_${src}
+CLEANFILES+=gdtoa_${src}
+gdtoa_${src}:
+	ln -sf ${.CURDIR}/../../contrib/gdtoa/${src} ${.TARGET}
+.endfor