From 275fe38f56cf07eb3e3c46e41d18402a94e66a5e Mon Sep 17 00:00:00 2001
From: Ryan Boland <bolandryanm@gmail.com>
Date: Mar 04 2020 13:11:47 +0000
Subject: Merge pull request #166 from michaelglass/patch-1


disable lto flag for darwin + nix
---

diff --git a/ext/extconf.rb b/ext/extconf.rb
index 259bdcf..36652f3 100644
--- a/ext/extconf.rb
+++ b/ext/extconf.rb
@@ -24,7 +24,12 @@ if enable_config('march-tune-native', false)
   $CXXFLAGS << ' -march=native -mtune=native'
 end
 
-if enable_config('lto', true)
+# darwin nix clang doesn't support lto
+# disable -lto flag for darwin + nix
+# see: https://github.com/sass/sassc-ruby/issues/148
+enable_lto_by_default = (Gem::Platform.local.os == "darwin" && !ENV['NIX_CC'].nil?)
+
+if enable_config('lto', enable_lto_by_default)
   $CFLAGS << ' -flto'
   $CXXFLAGS << ' -flto'
   $LDFLAGS << ' -flto'