may help you . In elems_[ptr] = data[ptr++], it is undefined whether elems_[ptr] is evaluated first or data[ptr++] is evaluated first. This is so, because = does not introduce a sequence point. Depending on the order, elems_[ptr] = data[ptr++] yields different results. Hence the warning.
"undefined variable" warning, yet variable is defined in all processes
like below fixes the issue The increment is undefined because once i reaches std::numeric_limits::max() (231 - 1 on a 32-bit, LP64 or LLP64 platform), incrementing it will overflow, which is undefined behavior for signed integral types. gcc is warning on iteration 4294967296ul (232) rather than iteration 2147483646u (231) as you might expect, because it doesn't know the initial value of i; some other code might have run before main to set i to something other than 0. But once main is entered, no other code can run to alter i, and so once 232 iterations have completed it will have at some point reached 231 - 1 and overflowed.
Ansible deprecation warning for undefined variable despite "when" clause
wish of those help In sbcl, I know I can muffle the anticipated messages when using both &optional and &key in defun, but that doesn't seem to work in defmacro. (I should just redesign/rewrite, I know, but this is legacy code.) , You need to run
$ sbcl --non-interactive --eval '(declaim (sb-ext:muffle-conditions style-warning))' --eval '(compile-file "5")'
This is SBCL 1.4.0, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.
SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses. See the CREDITS and COPYING files in the
distribution for more information.
; compiling file "/Users/sds/lisp/5.lisp" (written 09 OCT 2017 09:51:51 PM):
; compiling (DEFUN WILMA ...)
; compiling (DEFMACRO BETTY ...)
; /Users/sds/lisp/5.fasl written
; compilation finished in 0:00:00.010