From dcb168b10932b1b72396d5ac30ccd9a2394d97ae Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 5 Jun 2022 18:55:27 +0100
Subject: [PATCH] dieharder: add -fcommon workaround

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

    ld: include/dieharder/parse.h:21: multiple definition of `splitbuf';
      include/dieharder/parse.h:21: first defined here
---
 pkgs/tools/security/dieharder/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/security/dieharder/default.nix b/pkgs/tools/security/dieharder/default.nix
index 6e368c21c36..aa363a24a77 100644
--- a/pkgs/tools/security/dieharder/default.nix
+++ b/pkgs/tools/security/dieharder/default.nix
@@ -15,6 +15,11 @@ stdenv.mkDerivation rec {
     ./stdint.patch
   ];
 
+  # Workaround build failure on -fno-common toolchains:
+  #   ld: include/dieharder/parse.h:21: multiple definition of `splitbuf';
+  #     include/dieharder/parse.h:21: first defined here
+  NIX_CFLAGS_COMPILE = "-fcommon";
+
   buildInputs = [ gsl ];
 
   passthru = {