Introduce centralized means of checking for asyncify

The new function has an advantage of not requring EM_JS.

Change-Id: Ib9ad0e6b59cfe2e6864697a14b5cfdb39f62af2d
Reviewed-by: David Skoland <david.skoland@qt.io>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

2 files changed, 8 insertions, 0 deletions

diff --git a/src/corelib/platform/wasm/qstdweb.cpp b/src/corelib/platform/wasm/qstdweb.cpp
index 3a3cf4ada6..bead64f97d 100644
--- a/src/corelib/platform/wasm/qstdweb.cpp
+++ b/src/corelib/platform/wasm/qstdweb.cpp
@@ -667,6 +667,12 @@ namespace Promise {
     }
 }
 
+bool haveAsyncify()
+{
+    static bool HaveAsyncify = !emscripten::val::global("Asyncify").isUndefined();
+    return HaveAsyncify;
+}
+
 } // namespace qstdweb
 
 QT_END_NAMESPACE
diff --git a/src/corelib/platform/wasm/qstdweb_p.h b/src/corelib/platform/wasm/qstdweb_p.h
index e3c60b7188..badca5d402 100644
--- a/src/corelib/platform/wasm/qstdweb_p.h
+++ b/src/corelib/platform/wasm/qstdweb_p.h
@@ -189,6 +189,8 @@ namespace qstdweb {
         static emscripten::val savedWindow = emscripten::val::global("window");
         return savedWindow;
     }
+
+    bool haveAsyncify();
 }
 
 QT_END_NAMESPACE