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https://issues.apache.org/jira/browse/STDCXX-487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513391
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Martin Sebor commented on STDCXX-487:
-------------------------------------
Here's an enhanced test case showing that some warnings can be silenced by
casting the expression to bool:
$ cat t.cpp && icc -V t.cpp
int main ()
{
("") ? (void)0 : (void)1;
((bool)"") ? (void)0 : (void)1;
(bool ("")) ? (void)0 : (void)1;
(static_cast<bool>("")) ? (void)0 : (void)1;
}
Intel(R) C Compiler for applications running on Intel(R) 64, Version 10.0
Build 20070613 Package ID: l_cc_c_10.0.025
Copyright (C) 1985-2007 Intel Corporation. All rights reserved.
Edison Design Group C/C++ Front End, version 3.8 (Jun 13 2007 18:48:37)
Copyright 1988-2006 Edison Design Group, Inc.
t.cpp(3): warning #279: controlling expression is constant
("") ? (void)0 : (void)1;
^
GNU ld version 2.15.92.0.2 20040927
> [Intel C++/Linux] bogus/inconsistent warning #279 on !"..."
> -----------------------------------------------------------
>
> Key: STDCXX-487
> URL: https://issues.apache.org/jira/browse/STDCXX-487
> Project: C++ Standard Library
> Issue Type: Bug
> Components: External
> Environment: Intel C++ 9 and 10/Linux
> Reporter: Martin Sebor
>
> From https://premier.intel.com/premier/IssueDetail.aspx?IssueID=431380:
> The warning below is not justified and should not be issued. It produces
> noise for the common idiom: assert(!"...") used, for example, in case and
> switch statements to indicate unhandled cases. (I believe more recent
> versions of the EDG front end than the one used by icc 9 do not issue the
> warning anymore.)
> $ cat t.cpp && icc -V t.cpp
> int main (int argc, char**)
> {
> (!1 == argc) ? (void)0 : (void)0;
> (!"" == argc) ? (void)0 : (void)0;
> }
> Intel(R) C Compiler for Intel(R) EM64T-based applications, Version 9.1 Build
> 20070320 Package ID: l_cc_c_9.1.049
> Copyright (C) 1985-2007 Intel Corporation. All rights reserved.
> Edison Design Group C/C++ Front End, version 3.6 (Mar 22 2007 02:18:08)
> Copyright 1988-2005 Edison Design Group, Inc.
> t.cpp(4): warning #279: controlling expression is constant
> (!"" == argc) ? (void)0 : (void)0;
> ^
> GNU ld version 2.15.92.0.2 20040927
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