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#ifdef __clang__
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// clang already includes the condition in the error message and emits
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// an additional warning here if we use the variant without message
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#define compiletimeassert(cond) _Static_assert(cond,"")
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#elif __STDC_VERSION__ >= 201710L
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#define compiletimeassert(cond) _Static_assert(cond,#cond)
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#elif __STDC_VERSION__ >= 201112L
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#define compiletimeassert(cond) _Static_assert(cond,#cond)
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#else
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#define __X(x, y) x ## y
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#define __Y(x, y) __X(x, y)
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#define compiletimeassert(cond) struct __Y(foo,__LINE__) { char __temp[1 - (!(cond))*2]; };
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#endif
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