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-rw-r--r--src/corelib/tools/qsimd.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp
index 971d0c0cec..137988ce39 100644
--- a/src/corelib/tools/qsimd.cpp
+++ b/src/corelib/tools/qsimd.cpp
@@ -640,6 +640,10 @@ int ffsll(quint64 i)
# define ffsll __builtin_ffsll
#endif
+#if defined(Q_OS_NACL_NEWLIB) || defined(Q_OS_NACL_EMSCRIPTEN)
+# define ffsll __builtin_ffsll
+#endif
+
#ifdef Q_ATOMIC_INT64_IS_SUPPORTED
Q_CORE_EXPORT QBasicAtomicInteger<quint64> qt_cpu_features[1] = { Q_BASIC_ATOMIC_INITIALIZER(0) };
#else