From: "Mattias Engdegård" <mattiase@acm.org>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: emacs-devel <emacs-devel@gnu.org>
Subject: __builtin_assume warnings
Date: Wed, 12 Aug 2020 11:38:21 +0200 [thread overview]
Message-ID: <B7293869-E00B-45C3-ACBE-3324CB168B9D@acm.org> (raw)
Building on macOS with Apple clang version 11.0.0 (clang-1100.0.33.17) now gives a stream of warnings about:
In file included from ../../emacs/src/dispnew.c:27:
../../emacs/src/lisp.h:1812:12: warning: the argument to '__builtin_assume' has
side effects that will be discarded [-Wassume]
eassume (0 <= i && i < bool_vector_size (a));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../emacs/src/lisp.h:182:32: note: expanded from macro 'eassume'
# define eassume(cond) assume (cond)
^~~~
../../emacs/lib/verify.h:305:38: note: expanded from macro 'assume'
# define assume(R) __builtin_assume (R)
^
We could build with -Wno-assume, or alter the definition of 'assume' to
# define assume(R) _Pragma("clang diagnostic push") \
_Pragma("clang diagnostic ignored \"-Wassume\"") \
__builtin_assume (R) \
_Pragma("clang diagnostic pop")
but neither seems entirely satisfactory.
next reply other threads:[~2020-08-12 9:38 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-12 9:38 Mattias Engdegård [this message]
2020-08-15 2:32 ` __builtin_assume warnings Paul Eggert
2020-08-16 8:23 ` Mattias Engdegård
2020-08-17 14:05 ` Mattias Engdegård
2020-08-17 22:11 ` Paul Eggert
2020-08-18 7:11 ` Mattias Engdegård
2020-08-18 22:53 ` Paul Eggert
2020-08-19 8:01 ` Mattias Engdegård
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