[RFC PATCH v1 3/3] configure: Introduce `--cpp-thread` option

[Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>]

Allow user to force use C++ thread instead of pthread on Linux. It
also allows us to debug the C++ implementation on Linux.

Signed-off-by: Alviro Iskandar Setiawan <alviro.iskandar@gnuweeb.org>
---
 configure           | 8 ++++++++
 core/thread.cc      | 2 +-
 include/gw/thread.h | 2 +-
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 887b0b2..2f93056 100755
--- a/configure
+++ b/configure
@@ -40,6 +40,9 @@ for opt do
 	--sanitize)
 		use_sanitize="yes";
 	;;
+	--cpp-thread)
+		use_cpp_thread="yes";
+	;;
 	*)
 		echo "ERROR: unknown option $opt";
 		echo "Try '$0 --help' for more information";
@@ -60,6 +63,7 @@ Options: [defaults in brackets after descriptions]
   --cxx=CMD                Use CMD as the C++ compiler
   --debug                  Build with debug enabled
   --sanitize               Build with sanitize enabled
+  --cpp-thread             Force to use C++ thread implementation
 EOF
 exit 0;
 fi
@@ -308,6 +312,10 @@ if test "${use_sanitize}" = "yes"; then
 	LDFLAGS="${LDFLAGS} -fsanitize=address -fsanitize=undefined";
 fi;
 
+if test "${use_cpp_thread}" = "yes"; then
+	add_config "CONFIG_CPP_THREAD";
+fi;
+
 add_config "CONFIG_MODULE_PING";
 
 add_make_var "CC" "${cc}";
diff --git a/core/thread.cc b/core/thread.cc
index 54e06e7..50cc8ed 100644
--- a/core/thread.cc
+++ b/core/thread.cc
@@ -15,7 +15,7 @@
 extern "C" {
 #endif
 
-#if defined(__linux__)
+#if !defined(CONFIG_CPP_THREAD)
 
 int thread_create(thread_t *ts_p, void *(*func)(void *), void *arg)
 {
diff --git a/include/gw/thread.h b/include/gw/thread.h
index 68a0ee7..f383bd2 100644
--- a/include/gw/thread.h
+++ b/include/gw/thread.h
@@ -10,7 +10,7 @@
 extern "C" {
 #endif
 
-#if defined(__linux__)
+#if !defined(CONFIG_CPP_THREAD)
 #include <pthread.h>
 typedef pthread_t thread_t;
 typedef pthread_mutex_t mutex_t;
-- 
Alviro Iskandar Setiawan