From ca89e801ead2158f991e530031755a2a69372eec Mon Sep 17 00:00:00 2001
From: Ryan Burns <rtburns@protonmail.com>
Date: Wed, 14 Oct 2020 19:03:51 -0700
Subject: [PATCH] boost: fix segfaults on ppc64

Fixes https://github.com/NixOS/nix/issues/2517

See also:
https://github.com/boostorg/context/issues/72
https://github.com/boostorg/fiber/issues/193

These issues have been resolved by:
https://github.com/boostorg/context/pull/106
https://github.com/boostorg/context/commit/d4608a4e8ba2e8a0bdd45613243e6c53a23d23dc
which is merged into boost as of v1.71.0.

This feature was introduced (with the bug) in
boost v1.61 and was fixed in v1.71. So we apply
the patch to all versions in that range.
---
 pkgs/development/libraries/boost/generic.nix | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index a195a2c7bb9..b3950cb0d30 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -1,4 +1,5 @@
 { stdenv, icu, expat, zlib, bzip2, python, fixDarwinDylibNames, libiconv
+, fetchpatch
 , which
 , buildPackages
 , toolset ? /**/ if stdenv.cc.isClang  then "clang"
@@ -113,6 +114,14 @@ stdenv.mkDerivation {
     if version == "1.55.0"
     then ./darwin-1.55-no-system-python.patch
     else ./darwin-no-system-python.patch)
+  # Fix boost-context segmentation faults on ppc64 due to ABI violation
+  ++ optional (versionAtLeast version "1.61" &&
+               versionOlder version "1.71") (fetchpatch {
+    url = "https://github.com/boostorg/context/commit/2354eca9b776a6739112833f64754108cc0d1dc5.patch";
+    sha256 = "067m4bjpmcanqvg28djax9a10avmdwhlpfx6gn73kbqqq70dnz29";
+    stripLen = 1;
+    extraPrefix = "libs/context/";
+  })
   ++ optional (and (versionAtLeast version "1.70") (!versionAtLeast version "1.73")) ./cmake-paths.patch
   ++ optional (versionAtLeast version "1.73") ./cmake-paths-173.patch;