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Use volatile instead of benchmark::DoNotOptimize as GCC optimizes awa…#2111

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SaiCharanMarrivada:gcc-optimizes-away-the-write
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Use volatile instead of benchmark::DoNotOptimize as GCC optimizes awa…#2111
SaiCharanMarrivada wants to merge 2 commits into
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SaiCharanMarrivada:gcc-optimizes-away-the-write

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@SaiCharanMarrivada

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GCC optimizes away the write when we use benchmark::DoNotOptimize in stacktrace_benchmark.cc file. Using volatile for the array pointer fixes this. Compiler explorer link: https://godbolt.org/z/jzbKK3M1n

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