From 1b6b36735453f3a38bb6765b60a033cf10637dbd Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 29 May 2022 07:11:33 +0100
Subject: [PATCH] shallot: add -fcommon workaround

Workaround build failure on -fno-common toolchains like upstream
gcc-10. Otherwise build fails as:

    ld: src/shallot.o:(.bss+0x8): multiple definition of `lucky_thread'; src/error.o:(.bss+0x8): first defined here
---
 pkgs/tools/misc/shallot/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/misc/shallot/default.nix b/pkgs/tools/misc/shallot/default.nix
index c3c88a6baf0..93f67bd2def 100644
--- a/pkgs/tools/misc/shallot/default.nix
+++ b/pkgs/tools/misc/shallot/default.nix
@@ -30,6 +30,11 @@ stdenv.mkDerivation rec {
     })
   ];
 
+  # Workaround build failure on -fno-common toolchains like upstream
+  # gcc-10. Otherwise build fails as:
+  #   ld: src/shallot.o:(.bss+0x8): multiple definition of `lucky_thread'; src/error.o:(.bss+0x8): first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   installPhase = ''
     mkdir -p $out/bin
     cp ./shallot $out/bin/