kzhuravl added inline comments.

================
Comment at: test/SemaOpenCL/extensions.cl:47
 
+#ifndef _OPENCL_H_
 int isnan(float x) {
----------------
Anastasia wrote:
> Why do you need this?
`isnan` and `isfinite` are declared in opencl-c.h, so without guards I am 
getting redeclation diagnostics. Alternatively we can add overloadable 
attribute to `isnan` and `isfinite` in the test to avoid those diagnostic 
messages?


https://reviews.llvm.org/D28257



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