From 6868bb9ceb91799a700b0386dea3df17f99d68e1 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 5 Jun 2022 10:01:43 +0100
Subject: [PATCH] darwin.top: add -fcommon workaround

Workaround build failure on -fno-common toolchains like upstream
clang-11. Otherwise build fails as:

    duplicate symbol '_tsamp' in: main.o top.o
---
 pkgs/os-specific/darwin/apple-source-releases/top/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/os-specific/darwin/apple-source-releases/top/default.nix b/pkgs/os-specific/darwin/apple-source-releases/top/default.nix
index a2f912ca5782..ef766f7bd7f1 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/top/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/top/default.nix
@@ -3,6 +3,9 @@
 appleDerivation {
   nativeBuildInputs = [ xcbuildHook ];
   buildInputs = [ apple_sdk.frameworks.IOKit ncurses libutil ];
+  # Workaround build failure on -fno-common toolchains:
+  #   duplicate symbol '_tsamp' in: main.o top.o
+  NIX_CFLAGS_COMPILE = "-fcommon";
   NIX_LDFLAGS = "-lutil";
   installPhase = ''
     install -D Products/Release/libtop.a $out/lib/libtop.a