From b3bcb59bd5fddc3c0f74bbe120de561bbea29878 Mon Sep 17 00:00:00 2001
From: Michael Raskin <7c6f434c@mail.ru>
Date: Thu, 23 Jun 2016 11:01:21 +0200
Subject: tcsh: import an Arch patch (merging the two patches into a single
 one) for fixing gcc5 optimisation

---
 .../tcsh/avoid-gcc5-wrong-optimisation.patch       | 28 ++++++++++++++++++++++
 pkgs/shells/tcsh/default.nix                       |  9 +++++--
 2 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 pkgs/shells/tcsh/avoid-gcc5-wrong-optimisation.patch

diff --git a/pkgs/shells/tcsh/avoid-gcc5-wrong-optimisation.patch b/pkgs/shells/tcsh/avoid-gcc5-wrong-optimisation.patch
new file mode 100644
index 00000000000..b35d29680af
--- /dev/null
+++ b/pkgs/shells/tcsh/avoid-gcc5-wrong-optimisation.patch
@@ -0,0 +1,28 @@
+From: christos <christos>
+Date: Thu, 28 May 2015 11:47:03 +0000
+Subject: [PATCH] avoid gcc-5 optimization malloc + memset = calloc (Fridolin
+Pokorny)
+
+---
+tc.alloc.c | 5 ++++-
+1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/tc.alloc.c b/tc.alloc.c
+index b9aec63..c1cb330 100644
+--- a/tc.alloc.c
++++ b/tc.alloc.c
+@@ -348,10 +348,13 @@ calloc(size_t i, size_t j)
+ {
+ #ifndef lint
+     char *cp;
++    volatile size_t k;
+ 
+     i *= j;
+     cp = xmalloc(i);
+-    memset(cp, 0, i);
++    /* Stop gcc 5.x from optimizing malloc+memset = calloc */
++    k = i;
++    memset(cp, 0, k);
+ 
+     return ((memalign_t) cp);
+ #else
diff --git a/pkgs/shells/tcsh/default.nix b/pkgs/shells/tcsh/default.nix
index 52e6299c60c..419acd8d61d 100644
--- a/pkgs/shells/tcsh/default.nix
+++ b/pkgs/shells/tcsh/default.nix
@@ -6,10 +6,15 @@ stdenv.mkDerivation rec {
   version = "6.19.00";
   
   src = fetchurl {
-    urls = [ "ftp://ftp.funet.fi/pub/unix/shells/tcsh/${name}.tar.gz"
-             "http://ftp.funet.fi/pub/mirrors/ftp.astron.com/pub/tcsh/${name}.tar.gz" ];
+    urls = [ 
+             "http://ftp.funet.fi/pub/mirrors/ftp.astron.com/pub/tcsh/${name}.tar.gz" 
+             "ftp://ftp.astron.com/pub/tcsh/${name}.tar.gz" 
+             "ftp://ftp.funet.fi/pub/unix/shells/tcsh/${name}.tar.gz"
+             ];
     sha256 = "0jaw51382pqyb6d1kgfg8ir0wd3p5qr2bmg8svcmjhlyp3h73qhj";
   };
+
+  patches = [ ./avoid-gcc5-wrong-optimisation.patch ];
   
   buildInputs = [ ncurses ];
 
-- 
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