From b1b3ca79073ba82b551906fd11cc0ca086f81894 Mon Sep 17 00:00:00 2001
From: luc65r <lucas@ransan.tk>
Date: Mon, 8 Jun 2020 12:12:21 +0200
Subject: [PATCH] gcc: make -fcommon default on gcc10

---
 pkgs/development/compilers/gcc/common/configure-flags.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/development/compilers/gcc/common/configure-flags.nix b/pkgs/development/compilers/gcc/common/configure-flags.nix
index 7e0d691412b3..e6f3da0fd03c 100644
--- a/pkgs/development/compilers/gcc/common/configure-flags.nix
+++ b/pkgs/development/compilers/gcc/common/configure-flags.nix
@@ -194,6 +194,9 @@ let
     ++ lib.optionals (langD) [
       "--with-target-system-zlib=yes"
     ]
+    # Make -fcommon default on gcc10
+    # TODO: fix all packages (probably 100+) and remove that
+    ++ lib.optional (version >= "10.1.0") "--with-specs=%{!fno-common:%{!fcommon:-fcommon}}"
   ;
 
 in configureFlags