From: Philipp Stephani <p.stephani2@gmail.com>
To: 23261@debbugs.gnu.org
Subject: bug#23261: 25.0.92; Undefined behavior in lib/stdint.h
Date: Sun, 10 Apr 2016 15:51:31 +0200 [thread overview]
Message-ID: <m2oa9h4lng.fsf@gmail.com> (raw)
Clang finds the following undefined behavior in lib/stdint.h:
./lisp.h:3705:3: warning: shifting a negative signed value is undefined [-Wshift-negative-value]
XSETPVECTYPE (XVECTOR (v), PVEC_SUB_CHAR_TABLE);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./lisp.h:1124:24: note: expanded from macro 'XSETPVECTYPE'
((v)->header.size |= PSEUDOVECTOR_FLAG | ((code) << PSEUDOVECTOR_AREA_BITS))
^~~~~~~~~~~~~~~~~
./lisp.h:763:43: note: expanded from macro 'PSEUDOVECTOR_FLAG'
# define PSEUDOVECTOR_FLAG (PTRDIFF_MAX - PTRDIFF_MAX / 2)
^~~~~~~~~~~
../lib/stdint.h:520:5: note: expanded from macro 'PTRDIFF_MAX'
_STDINT_MAX (1, 64, 0l)
^~~~~~~~~~~~~~~~~~~~~~~
../lib/stdint.h:126:8: note: expanded from macro '_STDINT_MAX'
? ~ _STDINT_MIN (signed, bits, zero) \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../lib/stdint.h:122:31: note: expanded from macro '_STDINT_MIN'
((signed) ? (- ((zero) + 1) << ((bits) ? (bits) - 1 : 0)) : (zero))
~~~~~~~~~~~~~~ ^
Could we maybe just remove stdint.h completely? It should always be
provided by the standard C library.
In GNU Emacs 25.0.92.3 (x86_64-apple-darwin15.4.0, NS appkit-1404.46 Version 10.11.4 (Build 15E65))
of 2016-04-10 built on p
Repository revision: c8b868b1e2532aa07dbf4959798dbdc52ea9b5d5
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next reply other threads:[~2016-04-10 13:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-10 13:51 Philipp Stephani [this message]
2016-04-10 15:05 ` bug#23261: 25.0.92; Undefined behavior in lib/stdint.h Eli Zaretskii
2016-04-11 7:23 ` Paul Eggert
2016-04-11 16:17 ` Paul Eggert
2016-04-17 13:48 ` Philipp Stephani
2016-04-18 4:30 ` Paul Eggert
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