Fix some packages that referred to gets()

Glibc no longer defines gets() if _GNU_SOURCE is defined.

pkgs/development/libraries/gettext/default.nix

@@ -8,6 +8,8 @@ stdenv.mkDerivation (rec {
     sha256 = "1sa3ch12qxa4h3ya6hkz119yclcccmincl9j20dhrdx5mykp3b4k";
   };
 
+  patches = [ ./no-gets.patch ];
+
   configureFlags = [ "--disable-csharp" ]
      ++ (stdenv.lib.optionals stdenv.isCygwin
           [ # We have a static libiconv, so we can only build the static lib.

pkgs/development/libraries/gettext/no-gets.patch

@@ -0,0 +1,42 @@
+hack until gzip pulls a newer gnulib version
+
+From 66712c23388e93e5c518ebc8515140fa0c807348 Mon Sep 17 00:00:00 2001
+From: Eric Blake <eblake@redhat.com>
+Date: Thu, 29 Mar 2012 13:30:41 -0600
+Subject: [PATCH] stdio: don't assume gets any more
+
+Gnulib intentionally does not have a gets module, and now that C11
+and glibc have dropped it, we should be more proactive about warning
+any user on a platform that still has a declaration of this dangerous
+interface.
+
+--- a/gettext-tools/libgettextpo/stdio.in.h
++++ b/gettext-tools/libgettextpo/stdio.in.h
+@@ -125,7 +125,6 @@
+    so any use of gets warrants an unconditional warning.  Assume it is
+    always declared, since it is required by C89.  */
+ #undef gets
+-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ 
+ #if @GNULIB_FOPEN@
+ # if @REPLACE_FOPEN@
+--- a/gettext-tools/gnulib-lib/stdio.in.h
++++ b/gettext-tools/gnulib-lib/stdio.in.h
+@@ -125,7 +125,6 @@
+    so any use of gets warrants an unconditional warning.  Assume it is
+    always declared, since it is required by C89.  */
+ #undef gets
+-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ 
+ #if @GNULIB_FOPEN@
+ # if @REPLACE_FOPEN@
+--- a/gettext-runtime/gnulib-lib/stdio.in.h
++++ b/gettext-runtime/gnulib-lib/stdio.in.h
+@@ -125,7 +125,6 @@
+    so any use of gets warrants an unconditional warning.  Assume it is
+    always declared, since it is required by C89.  */
+ #undef gets
+-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ 
+ #if @GNULIB_FOPEN@
+ # if @REPLACE_FOPEN@

pkgs/development/tools/misc/gnum4/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation {
     && !stdenv.isSunOS;                    # XXX: `test-setlocale2.sh' fails
 
   # Upstream is aware of it; it may be in the next release.
-  patches = [ ./s_isdir.patch ./readlink-EINVAL.patch ];
+  patches = [ ./s_isdir.patch ./readlink-EINVAL.patch ./no-gets.patch ];
 
   meta = {
     homepage = http://www.gnu.org/software/m4/;

pkgs/development/tools/misc/gnum4/no-gets.patch

@@ -0,0 +1,26 @@
+http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/sys-devel/m4/files/m4-1.4.16-no-gets.patch?revision=1.1
+
+https://bugs.gentoo.org/424978
+
+hack until m4 pulls a newer gnulib version
+
+From 66712c23388e93e5c518ebc8515140fa0c807348 Mon Sep 17 00:00:00 2001
+From: Eric Blake <eblake@redhat.com>
+Date: Thu, 29 Mar 2012 13:30:41 -0600
+Subject: [PATCH] stdio: don't assume gets any more
+
+Gnulib intentionally does not have a gets module, and now that C11
+and glibc have dropped it, we should be more proactive about warning
+any user on a platform that still has a declaration of this dangerous
+interface.
+
+--- a/lib/stdio.in.h
++++ b/lib/stdio.in.h
+@@ -125,7 +125,6 @@
+    so any use of gets warrants an unconditional warning.  Assume it is
+    always declared, since it is required by C89.  */
+ #undef gets
+-_GL_WARN_ON_USE (gets, "gets is a security hole - use fgets instead");
+ 
+ #if @GNULIB_FOPEN@
+ # if @REPLACE_FOPEN@