From 7384e2a575dde2809784d9f182fd1d247064c8a2 Mon Sep 17 00:00:00 2001
From: Kristian Fiskerstrand <kf@sumptuouscapital.com>
Date: Thu, 11 Aug 2016 14:44:37 +0200
Subject: [PATCH] Qt: Append -std=c++11 if building against Qt 5.7

 * m4/qt.m4: Append -std=c++11 to CFLAGS if building against Qt 5.7

--
Qt 5.7 enables C++11 for Qt modules, and any app relying on it require to be
compiled with at least this standard.

This patch adds detection for Qt 5.7 and make sure -std=c++11 is passed if
building against Qt 5.7 or higher.
---
 m4/qt.m4 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/m4/qt.m4 b/m4/qt.m4
index 093f428..90c4a6e 100644
--- a/m4/qt.m4
+++ b/m4/qt.m4
@@ -35,6 +35,7 @@ AC_DEFUN([FIND_QT],
                 enable_pinentry_qt5="try")
 
   have_qt5_libs="no";
+  require_qt_cpp11="no";
 
   if test "$enable_pinentry_qt5" != "no"; then
     PKG_CHECK_MODULES(PINENTRY_QT,
@@ -47,6 +48,15 @@ AC_DEFUN([FIND_QT],
     fi
   fi
   if test "$have_qt5_libs" = "yes"; then
+    PKG_CHECK_MODULES(PINENTRY_QT_REQUIRE_CPP11,
+                      Qt5Core >= 5.7.0,
+                      [require_qt_cpp11="yes"],
+                      [require_qt_cpp11="no"])
+
+    if test "${require_qt_cpp11}" = "yes"; then
+      PINENTRY_QT_CFLAGS="$PINENTRY_QT_CFLAGS -std=c++11"
+    fi
+
     AC_CHECK_TOOL(MOC, moc)
     AC_MSG_CHECKING([moc version])
     mocversion=`$MOC -v 2>&1`
-- 
2.7.3