/usr/include/clc/geometric/cross.h is in libclc-dev 0~git20140101-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | _CLC_OVERLOAD _CLC_DECL float3 cross(float3 p0, float3 p1);
_CLC_OVERLOAD _CLC_DECL float4 cross(float4 p0, float4 p1);
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