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Latest compilers are able to figure out that whole code can be optmized away when CFLAGS has -O2 or more agressive optimizations. In order to ensure the test is doing the right thing, make the variables global so compiler is not able to optimize it away. This fixes build on x86 especially when using clang compiler (From OE-Core rev: e9c4017982a5556580d24e72e74c4d5a879ff11c) Signed-off-by: Khem Raj <raj.khem@gmail.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>