In debug builds, the Intel compiler produces warnings about conversions from larger types to smaller types perhaps losing significant bits, even when using an explicit cast.  The -WX flag in W_CFLAGS causes the compilation to then fail.  So in debug builds, force the W_CFLAGS variable to be empty.  We'll get the warnings, but compilation can continue.
In debug builds, the Intel compiler produces warnings about
conversions from larger types to smaller types perhaps losing
significant bits, even when using an explicit cast.  The -WX flag in
W_CFLAGS causes the compilation to then fail.  So in debug builds,
force the W_CFLAGS variable to be empty.  We'll get the warnings, but
compilation can continue.

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