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Fix preprocessor macro existence check in bignum.c
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@ -741,14 +741,19 @@ static mbedtls_mpi_uint mpi_uint_bigendian_to_host( mbedtls_mpi_uint x )
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#if ( __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ )
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/* For GCC and Clang, have builtins for byte swapping. */
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#if( defined(__GNUC__) && defined(__GNUC_PREREQ) && __GNUC_PREREQ(4,3) )
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#if defined(__GNUC__) && defined(__GNUC_PREREQ)
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#if __GNUC_PREREQ(4,3)
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#define have_bswap
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#elif defined(__clang__) && \
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defined(__has_builtin) && \
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__has_builtin(__builtin_bswap32) && \
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#endif
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#endif
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#if defined(__clang__) && defined(__has_builtin)
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#if __has_builtin(__builtin_bswap32) && \
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__has_builtin(__builtin_bswap64)
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#define have_bswap
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#endif
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#endif
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#if defined(have_bswap)
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/* The compiler is hopefully able to statically evaluate this! */
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switch( sizeof(mbedtls_mpi_uint) )
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