[PATCH 01/17] Skeleton documentation for the RISC-V port

[Palmer Dabbelt <palmer@dabbelt.com>]

During the upstreaming process it was suggested that I add a handful of
small documentation entries about the RISC-V port, which I've collected
here.

2018-01-13  Palmer Dabbelt  <palmer@sifive.com>

        * manual/math.texi: RISC-V supports _Float128 and _Float64x
---
 NEWS             | 15 +++++++++++----
 README           |  2 ++
 manual/math.texi |  2 +-
 3 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/NEWS b/NEWS
index ecefc5236489..4cd77c1e2f98 100644
--- a/NEWS
+++ b/NEWS
@@ -41,13 +41,13 @@ Major new features:
   process aborts as the result of assertion failures.
 
 * On platforms where long double has the IEEE binary128 format (aarch64,
-  alpha, mips64, s390 and sparc), the math library now implements _Float128
-  interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.  These
-  are the same interfaces added in version 2.26 for some platforms where
+  alpha, mips64, riscv, s390 and sparc), the math library now implements
+  _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
+  These are the same interfaces added in version 2.26 for some platforms where
   this format is supported but is not the format of long double.
 
 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
-  mips64, powerpc64le, s390, sparc and x86_64), the math library now
+  mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
   implements interfaces for that type, as defined by ISO/IEC TS
   18661-3:2015.  These are corresponding interfaces to those supported for
   _Float128.
@@ -98,6 +98,13 @@ Major new features:
   to fail to load locales and fall back to the builtin C/POSIX locales.
   See notes below for other changes affecting compatibility.
 
+* Support for the RISC-V ISA running on Linux has been added.  This port
+  requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
+  for the following ISA and ABI pairs:
+
+    - rv64imafdc lp64
+    - rv64imafdc lp64d
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * Statically compiled applications attempting to load locales compiled for the
diff --git a/README b/README
index d0e99ea7d5a0..425a82956fc8 100644
--- a/README
+++ b/README
@@ -39,6 +39,8 @@ The GNU C Library supports these configurations for using Linux kernels:
 	powerpc64*-*-linux-gnu	Big-endian and little-endian.
 	s390-*-linux-gnu
 	s390x-*-linux-gnu
+	riscv32-*-linux-gnu
+	riscv64-*-linux-gnu
 	sh[34]-*-linux-gnu
 	sparc*-*-linux-gnu
 	sparc64*-*-linux-gnu
diff --git a/manual/math.texi b/manual/math.texi
index a9f2a9813832..d19a14b47dc3 100644
--- a/manual/math.texi
+++ b/manual/math.texi
@@ -70,7 +70,7 @@ provided for @code{_Float32}, @code{_Float64} and @code{_Float32x} on
 all platforms.
 It is also provided for @code{_Float128} and @code{_Float64x} on
 powerpc64le (PowerPC 64-bits little-endian), x86_64, x86, ia64,
-aarch64, alpha, mips64, s390 and sparc.
+aarch64, alpha, mips64, riscv, s390 and sparc.
 
 @menu
 * Mathematical Constants::      Precise numeric values for often-used
-- 
2.13.6