crypto/sha256: Use pragmas to enforce necessary intrinsics for GCC and Clang #102
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…d Clang This avoids problems when the user specifies CXXFLAGS explicitly disabling the relevant optimisations.
…or GCC and Clang if possible
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CMake port of bitcoin#13789
Instead of disabling optimised crypto, bypass the user-provided CXXFLAGS (which still instruct the compiler how to handle unconditional code) when possible and check at runtime.