From 63a1a2ac63451fc47a5992f8e04e42843f019ecd Mon Sep 17 00:00:00 2001
From: David McFarland <corngood@gmail.com>
Date: Tue, 20 Jun 2017 15:04:24 -0300
Subject: [PATCH] stdenv: disable -fPIC on cygwin

It's always on, and you get a warning if you specify it
---
 pkgs/build-support/cc-wrapper/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index 0c624a1454a..e955313e7bd 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -359,7 +359,13 @@ stdenv.mkDerivation {
       if [[ "$($ldPath/${prefix}ld -z relro 2>&1 || true)" =~ un(recognized|known)\ option ]]; then
         hardening_unsupported_flags+=" relro"
       fi
+    ''
 
+    + optionalString hostPlatform.isCygwin ''
+      hardening_unsupported_flags+=" pic"
+    ''
+
+    + ''
       substituteAll ${preWrap ./add-flags.sh} $out/nix-support/add-flags.sh
       substituteAll ${preWrap ./add-hardening.sh} $out/nix-support/add-hardening.sh
       cp -p ${preWrap ./utils.sh} $out/nix-support/utils.sh