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@@ -0,0 +1,127 @@
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+From 3bfcb171026c4fd5c7caf807f79184a81c8af5b2 Mon Sep 17 00:00:00 2001
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+From: =?UTF-8?q?J=C3=B6rg=20Krause?= <joerg.krause@embedded.rocks>
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+Date: Sun, 11 Sep 2016 21:09:22 +0200
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+Subject: [PATCH] Check for std::future
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+MIME-Version: 1.0
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+Content-Type: text/plain; charset=UTF-8
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+Content-Transfer-Encoding: 8bit
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+
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+std::future is not available for all architectures, e.g. it is missing
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+for ARMv5 (soft-float).
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+
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+The problem is that libstdc++ only enables `std::future` if
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+`ATOMIC_INT_LOCK_FREE > 1` which is not true for the ARMv5 target.
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+
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+As the future functionality is not used for much we just ifdef out the
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+parts from `std::future`.
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+
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+Upstream-status: https://github.com/medoc92/libupnpp/issues/8
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+
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+This patch is squashed from two upstream commits:
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+1/ d3e3cada667cca5b70693b351e5865231275dd82
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+2/ 90407dcc206987c8e58d61c64db539489f0717d2
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+
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+Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
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+---
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+ configure.ac | 17 +++++++++++++++++
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+ libupnpp/config.h.in | 3 +++
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+ libupnpp/workqueue.h | 14 +++++++++++++-
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+ 3 files changed, 33 insertions(+), 1 deletion(-)
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+
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+diff --git a/configure.ac b/configure.ac
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+index 877a773..9ff2058 100644
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+--- a/configure.ac
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++++ b/configure.ac
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+@@ -47,6 +47,23 @@ AC_DEFINE([_FILE_OFFSET_BITS], [64], [File Offset size])
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+ AC_CHECK_LIB([rt], [clock_gettime], [], [])
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+ AC_CHECK_LIB([pthread], [pthread_create], [], [])
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+
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++# Check that std::future is available.
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++AC_LANG_PUSH([C++])
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++CXXFLAGS="-std=c++11 $CXXFLAGS"
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++AC_MSG_CHECKING([whether std::future is available])
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++AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <future>]],
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++ [[std::future<int> f;]])],
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++ [ AC_DEFINE([HAVE_STD_FUTURE], [1],
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++ [Define to 1 if you have the `std::future`.])
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++ have_std_future=yes
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++ ],
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++ [
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++ have_std_future=no
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++ ]
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++)
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++AC_MSG_RESULT([$have_std_future])
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++AC_LANG_POP
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++
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+ # The 2 following checks for libthreadutil and libixml are normally
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+ # unnecessary and even problematic. libupnpp does not use them directly,
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+ # and they should be used automatically because libupnpp is linked with them.
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+diff --git a/libupnpp/config.h.in b/libupnpp/config.h.in
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+index 39fa410..4471855 100644
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+--- a/libupnpp/config.h.in
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++++ b/libupnpp/config.h.in
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+@@ -36,6 +36,9 @@
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+ /* Define to 1 if you have the <stdlib.h> header file. */
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+ #undef HAVE_STDLIB_H
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+
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++/* Define to 1 if you have the `std::future`. */
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++#undef HAVE_STD_FUTURE
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++
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+ /* Define to 1 if you have the <strings.h> header file. */
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+ #undef HAVE_STRINGS_H
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+
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+diff --git a/libupnpp/workqueue.h b/libupnpp/workqueue.h
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+index 52a6138..9c0ec02 100644
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+--- a/libupnpp/workqueue.h
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++++ b/libupnpp/workqueue.h
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+@@ -18,7 +18,9 @@
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+ #define _WORKQUEUE_H_INCLUDED_
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+
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+ #include <thread>
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++#if HAVE_STD_FUTURE
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+ #include <future>
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++#endif
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+ #include <string>
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+ #include <queue>
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+ #include <list>
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+@@ -76,10 +78,14 @@ public:
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+ bool start(int nworkers, void *(workproc)(void *), void *arg) {
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+ std::unique_lock<std::mutex> lock(m_mutex);
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+ for (int i = 0; i < nworkers; i++) {
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+- std::packaged_task<void *(void *)> task(workproc);
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+ Worker w;
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++#if HAVE_STD_FUTURE
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++ std::packaged_task<void *(void *)> task(workproc);
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+ w.res = task.get_future();
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+ w.thr = std::thread(std::move(task), arg);
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++#else
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++ w.thr = std::thread(workproc, arg);
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++#endif
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+ m_worker_threads.push_back(std::move(w));
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+ }
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+ return true;
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+@@ -189,7 +195,11 @@ public:
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+ // Workers return (void*)1 if ok
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+ void *statusall = (void*)1;
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+ while (!m_worker_threads.empty()) {
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++#if HAVE_STD_FUTURE
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+ void *status = m_worker_threads.front().res.get();
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++#else
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++ void *status = (void*) 1;
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++#endif
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+ m_worker_threads.front().thr.join();
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+ if (status == (void *)0) {
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+ statusall = status;
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+@@ -305,7 +315,9 @@ private:
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+
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+ struct Worker {
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+ std::thread thr;
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++#if HAVE_STD_FUTURE
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+ std::future<void *> res;
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++#endif
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+ };
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+
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+ // Configuration
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+--
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+2.9.3
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+
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Jörg Krause