From a61fdebc2532d1547640346118c72ecad0191fc7 Mon Sep 17 00:00:00 2001
From: Shea Levy <shea@shealevy.com>
Date: Sun, 18 Feb 2018 00:52:55 -0500
Subject: [PATCH] libatomic_ops: Add patch for RISC-V support.

---
 .../libraries/libatomic_ops/default.nix       |  5 ++-
 .../libraries/libatomic_ops/riscv.patch       | 40 +++++++++++++++++++
 2 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/libraries/libatomic_ops/riscv.patch

diff --git a/pkgs/development/libraries/libatomic_ops/default.nix b/pkgs/development/libraries/libatomic_ops/default.nix
index 3aae754be40..714e9361440 100644
--- a/pkgs/development/libraries/libatomic_ops/default.nix
+++ b/pkgs/development/libraries/libatomic_ops/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, autoconf, automake, libtool }:
+{ stdenv, fetchurl, autoconf, automake, libtool, hostPlatform }:
 
 stdenv.mkDerivation rec {
   name = "libatomic_ops-${version}";
@@ -12,6 +12,9 @@ stdenv.mkDerivation rec {
     sha256 ="1rif2hjscq5mh639nsnjhb90c01gnmy1sbmj6x6hsn1xmpnj95r1";
   };
 
+  # https://github.com/ivmai/libatomic_ops/pull/32
+  patches = if hostPlatform.isRiscV then [ ./riscv.patch ] else null;
+
   nativeBuildInputs = stdenv.lib.optionals stdenv.isCygwin [ autoconf automake libtool ];
 
   preConfigure = stdenv.lib.optionalString stdenv.isCygwin ''
diff --git a/pkgs/development/libraries/libatomic_ops/riscv.patch b/pkgs/development/libraries/libatomic_ops/riscv.patch
new file mode 100644
index 00000000000..27f2408c34c
--- /dev/null
+++ b/pkgs/development/libraries/libatomic_ops/riscv.patch
@@ -0,0 +1,40 @@
+diff -Naur libatomic_ops-7.6.2-orig/src/atomic_ops/sysdeps/gcc/riscv.h libatomic_ops-7.6.2/src/atomic_ops/sysdeps/gcc/riscv.h
+--- libatomic_ops-7.6.2-orig/src/atomic_ops/sysdeps/gcc/riscv.h	1969-12-31 19:00:00.000000000 -0500
++++ libatomic_ops-7.6.2/src/atomic_ops/sysdeps/gcc/riscv.h	2018-02-18 00:48:53.581721375 -0500
+@@ -0,0 +1 @@
++#include "generic.h"
+diff -Naur libatomic_ops-7.6.2-orig/src/atomic_ops.h libatomic_ops-7.6.2/src/atomic_ops.h
+--- libatomic_ops-7.6.2-orig/src/atomic_ops.h	2017-12-24 03:31:12.000000000 -0500
++++ libatomic_ops-7.6.2/src/atomic_ops.h	2018-02-18 00:48:53.580721359 -0500
+@@ -352,6 +352,9 @@
+ # if defined(__tile__)
+ #   include "atomic_ops/sysdeps/gcc/tile.h"
+ # endif
++# if defined(__riscv)
++#   include "atomic_ops/sysdeps/gcc/riscv.h"
++# endif
+ #endif /* __GNUC__ && !AO_USE_PTHREAD_DEFS */
+ 
+ #if (defined(__IBMC__) || defined(__IBMCPP__)) && !defined(__GNUC__) \
+diff -Naur libatomic_ops-7.6.2-orig/src/Makefile.am libatomic_ops-7.6.2/src/Makefile.am
+--- libatomic_ops-7.6.2-orig/src/Makefile.am	2017-12-24 03:31:12.000000000 -0500
++++ libatomic_ops-7.6.2/src/Makefile.am	2018-02-18 00:48:53.579721342 -0500
+@@ -92,6 +92,7 @@
+           atomic_ops/sysdeps/gcc/mips.h \
+           atomic_ops/sysdeps/gcc/nios2.h \
+           atomic_ops/sysdeps/gcc/powerpc.h \
++          atomic_ops/sysdeps/gcc/riscv.h \
+           atomic_ops/sysdeps/gcc/s390.h \
+           atomic_ops/sysdeps/gcc/sh.h \
+           atomic_ops/sysdeps/gcc/sparc.h \
+diff -Naur libatomic_ops-7.6.2-orig/src/Makefile.in libatomic_ops-7.6.2/src/Makefile.in
+--- libatomic_ops-7.6.2-orig/src/Makefile.in	2017-12-24 03:32:23.000000000 -0500
++++ libatomic_ops-7.6.2/src/Makefile.in	2018-02-18 00:49:14.005062121 -0500
+@@ -446,6 +446,7 @@
+           atomic_ops/sysdeps/gcc/mips.h \
+           atomic_ops/sysdeps/gcc/nios2.h \
+           atomic_ops/sysdeps/gcc/powerpc.h \
++          atomic_ops/sysdeps/gcc/riscv.h \
+           atomic_ops/sysdeps/gcc/s390.h \
+           atomic_ops/sysdeps/gcc/sh.h \
+           atomic_ops/sysdeps/gcc/sparc.h \