Bug#833931: marked as done (c++: Fail to build when <stdnoreturn.h> and the noreturn keyword is used)
Your message dated Thu, 7 Feb 2019 10:37:16 +0100
with message-id <[🔎] 081ceef8-afd3-c797-3072-b62905cd500b@debian.org>
and subject line Re: Bug#833931: c++: Fail to build when <stdnoreturn.h> and the noreturn keyword is used
has caused the Debian Bug report #833931,
regarding c++: Fail to build when <stdnoreturn.h> and the noreturn keyword is used
to be marked as done.
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833931: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=833931
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--- Begin Message ---
- To: submit@bugs.debian.org
- Subject: c++: Fail to build when <stdnoreturn.h> and the noreturn keyword is used
- From: Petter Reinholdtsen <pere@hungry.com>
- Date: Wed, 10 Aug 2016 16:23:42 +0200
- Message-id: <2flk2fou2hd.fsf@diskless.uio.no>
Package: g++-6
Version: 6.1.1-11
I ran into this issue while trying to prepare the coz profiler for
Debian.
The <stdnoreturn.h> header file seem to be inefficient when using cc and
clang, be ignored causing an build error when using c++.
I found this example code on
<URL: http://en.cppreference.com/w/c/language/_Noreturn >, and it fail
to build with c++, but build with both cc and clang:
% cat > y.c
#include <stdlib.h>
#include <stdio.h>
#include <stdnoreturn.h>
// causes undefined behavior if i <= 0
// exits if i > 0
noreturn void stop_now(int i) // or _Noreturn void stop_now(int i)
{
if (i > 0) exit(i);
}
int main(void)
{
puts("Preparing to stop...");
stop_now(2);
puts("This code is never executed.");
}
% gcc y.c
y.c: In function 'stop_now':
y.c:10:1: warning: 'noreturn' function does return
}
^
% ./a.out
Preparing to stop...
% c++ y.c
y.c:7:1: error: 'noreturn' does not name a type
noreturn void stop_now(int i) // or _Noreturn void stop_now(int i)
^~~~~~~~
y.c: In function 'int main()':
y.c:15:13: error: 'stop_now' was not declared in this scope
stop_now(2);
^
% clang y.c
y.c:10:1: warning: function declared 'noreturn' should not return [-Winvalid-noreturn]
}
^
1 warning generated.
%
Perhaps something that should be fixed?
--
Happy hacking
Petter Reinholdtsen
--- End Message ---
--- Begin Message ---
On 07.02.19 08:07, Petter Reinholdtsen wrote:
> Control: forwarded -1 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89232
>
> I registered the issue upstream.
closed as invalid.
--- End Message ---
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