From 386207e312c64926cd522dd2ad790ec3bb6330b7 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sat, 4 Jun 2022 17:40:13 +0100
Subject: [PATCH] mmixware: add -fcommon workaround

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

    ld: mmix-config.o:(.bss+0x600): multiple definition of `buffer'; /build/ccDuGrwH.o:(.bss+0x20): first defined here
---
 pkgs/development/tools/mmixware/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/development/tools/mmixware/default.nix b/pkgs/development/tools/mmixware/default.nix
index 4f0515eec2f5..2b14bf09ddbd 100644
--- a/pkgs/development/tools/mmixware/default.nix
+++ b/pkgs/development/tools/mmixware/default.nix
@@ -18,6 +18,10 @@ stdenv.mkDerivation {
     substituteInPlace Makefile --replace 'rm abstime.h' ""
   '';
 
+  # Workaround build failure on -fno-common toolchains:
+  #   ld: mmix-config.o:(.bss+0x600): multiple definition of `buffer'; /build/ccDuGrwH.o:(.bss+0x20): first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   nativeBuildInputs = [ tetex ];
   enableParallelBuilding = true;