From dc5810ada6eebd048c091e6ba1bd36d628748db1 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Mon, 11 Oct 2021 09:46:38 +0100
Subject: [PATCH] strongswan: fix build against -fno-common toolchain

Example toolchain is clang-12:

    $ nix-build -E 'with import ./. {}; strongswan.override { stdenv = clang12Stdenv; }'
    ...
    ld: commands/load_authorities.o:/build/source/src/swanctl/./swanctl.h:33:
      multiple definition of `swanctl_dir';
        commands/load_all.o:/build/source/src/swanctl/./swanctl.h:33: first defined here

Pull upstream fix.
---
 pkgs/tools/networking/strongswan/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pkgs/tools/networking/strongswan/default.nix b/pkgs/tools/networking/strongswan/default.nix
index ff69dbc75445..601446abb95c 100644
--- a/pkgs/tools/networking/strongswan/default.nix
+++ b/pkgs/tools/networking/strongswan/default.nix
@@ -46,6 +46,13 @@ stdenv.mkDerivation rec {
       url = "https://patch-diff.githubusercontent.com/raw/strongswan/strongswan/pull/150.patch";
       sha256 = "1irfxb99blb8v3hs0kmlhzkkwbmds1p0gq319z8lmacz36cgyj2c";
     })
+
+    # fix build with -fno-common tollchain
+    (fetchpatch {
+      name = "fno-common.patch";
+      url = "https://git.strongswan.org/?p=strongswan.git;a=patch;h=91c6387e69c09beaa9b9ca1e28471751a834fc24";
+      sha256 = "0jp9walxwffp5cl7q0hb80h3s2gdj1nn3n8bvnbmwgh2s6pi148f";
+    })
   ];
 
   postPatch = optionalString stdenv.isLinux ''