CompCert (compcert.inria.fr) is a C compiler. coreutils test whether some types (e.g. time_t) that it thinks should be integer types (as opposed to floats) using compile-time tricks: To test whether T is an integer type, it does (T) 1.5 == 1, and uses the result in the computation of the width of a bitfield, such that if the test is false the width is illegal and produces a compile-time error (this is an old fashioned way of doing a static assert).
Unfortunately, under CompCert, floating-point values are not simplified at compile time (due to concerns that this simplification may differ from the operations on the target platform). Thus the test always fails. Possible fix: diff -u -r coreutils-8.30-orig/lib/intprops.h coreutils-8.30/lib/intprops.h --- coreutils-8.30-orig/lib/intprops.h 2018-05-14 06:22:34.000000000 +0200 +++ coreutils-8.30/lib/intprops.h 2019-01-24 14:55:24.567674345 +0100 @@ -34,7 +34,11 @@ /* True if the arithmetic type T is an integer type. bool counts as an integer. */ +#ifdef __COMPCERT__ +#define TYPE_IS_INTEGER(t) 1 +#else #define TYPE_IS_INTEGER(t) ((t) 1.5 == 1) +#endif /* True if the real type T is signed. */ #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) Directeur de recherche au CNRS, laboratoire VERIMAG, équipe PACSS http://www-verimag.imag.fr/~monniaux/