-------- Forwarded Message --------
Subject: bug#34220: failure to building with CompCert, patch proposed
Resent-Date: Sun, 27 Jan 2019 16:58:02 +0000
Resent-From: DAVID MONNIAUX <david.monni...@univ-grenoble-alpes.fr>
Resent-CC: bug-coreut...@gnu.org
Date: Sun, 27 Jan 2019 16:53:27 +0100 (CET)
From: DAVID MONNIAUX <david.monni...@univ-grenoble-alpes.fr>
To: 34...@debbugs.gnu.org
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/
