From f29fa2098cee9209abbb3b5cd21855aacf5bb383 Mon Sep 17 00:00:00 2001
From: Andrew Childs <lorne@cons.org.nz>
Date: Thu, 28 Jun 2018 17:25:18 +0900
Subject: [PATCH] bison2: Fix Darwin runtime crash

---
 pkgs/development/tools/parsing/bison/2.x.nix         |  4 +++-
 .../tools/parsing/bison/darwin-vasnprintf.patch      | 12 ++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/development/tools/parsing/bison/darwin-vasnprintf.patch

diff --git a/pkgs/development/tools/parsing/bison/2.x.nix b/pkgs/development/tools/parsing/bison/2.x.nix
index d760cec62a04..cc4891cb06f5 100644
--- a/pkgs/development/tools/parsing/bison/2.x.nix
+++ b/pkgs/development/tools/parsing/bison/2.x.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, m4, perl }:
+{ stdenv, lib, fetchurl, m4, perl }:
 
 stdenv.mkDerivation rec {
   name = "bison-2.7";
@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ m4 ] ++ stdenv.lib.optional doCheck perl;
   propagatedBuildInputs = [ m4 ];
 
+  patches = lib.optional stdenv.isDarwin ./darwin-vasnprintf.patch;
+
   doCheck = true;
   # M4 = "${m4}/bin/m4";
 
diff --git a/pkgs/development/tools/parsing/bison/darwin-vasnprintf.patch b/pkgs/development/tools/parsing/bison/darwin-vasnprintf.patch
new file mode 100644
index 000000000000..84b0e6d39d87
--- /dev/null
+++ b/pkgs/development/tools/parsing/bison/darwin-vasnprintf.patch
@@ -0,0 +1,12 @@
+diff -ur bison-2.7-pristine/lib/vasnprintf.c bison-2.7/lib/vasnprintf.c
+--- bison-2.7-pristine/lib/vasnprintf.c	2012-11-30 20:48:23.000000000 +0900
++++ bison-2.7/lib/vasnprintf.c	2018-06-28 16:55:31.000000000 +0900
+@@ -4870,7 +4870,7 @@
+ #endif
+                   *fbp = dp->conversion;
+ #if USE_SNPRINTF
+-# if !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__))
++# if !(((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) && !defined __UCLIBC__) || ((defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__) || (defined __APPLE__ && defined __MACH__))
+                 fbp[1] = '%';
+                 fbp[2] = 'n';
+                 fbp[3] = '\0';