From dd22a28160cb4a9f563a9af728cc645f2ab35e31 Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 2 Mar 2017 13:17:48 +0100
Subject: [PATCH] C++11 compilation for OSX 10.8

---
 xs/Build.PL | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/xs/Build.PL b/xs/Build.PL
index 557a5fd451..c6648d9285 100644
--- a/xs/Build.PL
+++ b/xs/Build.PL
@@ -23,8 +23,17 @@ if ($cpp_guess->is_gcc)	{
 	push @cflags, qw(-U__STRICT_ANSI__);
 }
 my @ldflags = ();
-if ($^O eq 'darwin') {
-    push @ldflags, qw(-framework IOKit -framework CoreFoundation);
+if ($^O eq 'darwin' && `sw_vers -productVersion` =~ /\b10\.8\./) {
+    push @cflags, qw(-stdlib=libc++);
+    push @ldflags, qw(-framework IOKit -framework CoreFoundation -lc++);
+    
+    # Due to a bug/misconfiguration/stupidity, boost 1.52 and libc++ don't like each
+    # other much: a compilation error "Constexpr function never produces a constant
+    # expression" pops up when trying to compile anything that uses
+    # boost/chrono/duration.hpp (namely boost/thread for us). This is a workaround
+    # that prevents this from happening, not needed with newer Boost versions.
+    # See here for more details: https://svn.boost.org/trac/boost/ticket/7671
+    push @cflags, qw(-DBOOST_THREAD_DONT_USE_CHRONO -DBOOST_NO_CXX11_RVALUE_REFERENCES -DBOOST_THREAD_USES_MOVE);
 }
 if ($mswin) {
     # In case windows.h is included, we don't want the min / max macros to be active.