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-rw-r--r--clang/lib/Headers/opencl-c.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/clang/lib/Headers/opencl-c.h b/clang/lib/Headers/opencl-c.h
index e1349cbe199..0a36a84deb8 100644
--- a/clang/lib/Headers/opencl-c.h
+++ b/clang/lib/Headers/opencl-c.h
@@ -14469,7 +14469,7 @@ half16 __ovld __cnfn shuffle2(half16 x, half16 y, ushort16 mask);
#if __OPENCL_C_VERSION__ >= CL_VERSION_1_2
// OpenCL v1.2 s6.12.13, v2.0 s6.13.13 - printf
-int printf(__constant const char* st, ...);
+int printf(__constant const char* st, ...) __attribute__((format(printf, 1, 2)));
#endif
// OpenCL v1.1 s6.11.3, v1.2 s6.12.14, v2.0 s6.13.14 - Image Read and Write Functions
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