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Re: Warning in LLVM Clang

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On 1/8/20 5:41 PM, David Brown wrote:
> On 08/01/2020 14:05, Mehdi Amini wrote:
>> On 1/7/20 6:03 PM, Ben Bacarisse wrote:
>>> Mehdi Amini <atorrses@gmail.com> writes:
>>>
>>>> On 1/6/20 7:28 PM, Ben Bacarisse wrote:
>>

[...]

> It does not matter how big the source is.  What you have to do is figure
> out a minimal, stand-alone, compilable snippet of code that demonstrates
> the problem.  It does not have to be an extraction from the original
> code - usually it is better to write a new test "foo" function that has
> the same effect.  This process has at least three major benefits:
> 
> 1. It means other people can help you, because they can see a short bit
> of code.  No one is going to wade through dozens of long source files on
> github (or whatever) to help, but many are happy to read through a dozen
> lines of code in a Usenet post.
> 
> 2. During the process of making such a sample, there is a good chance
> that you will figure it out yourself, and learn something in the
> process.  This happens often.
> 
> 3. You can paste the code into <https://godbolt.org> and test it out
> with different compilers, different versions, different warning settings
> and flag options.  This can be a big help for you in finding out what is
> going on.
> 
> 
> 
>> On compiler versions:
>>
>> :~$ clang --version
>> clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
>> Target: x86_64-pc-linux-gnu
>> Thread model: posix
>> InstalledDir: /usr/bin
>>
>> :~$ gcc --version
>> gcc (Ubuntu 7.4.0-1ubuntu1~18.04.1) 7.4.0
>> Copyright (C) 2017 Free Software Foundation, Inc.
>> This is free software; see the source for copying conditions.  There is
>> NO
>> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
>> PURPOSE.
>>

OK , here is my try on this link:

https://www.tutorialspoint.com/compile_c_online.php

Code:
// pragma problem
#include <stdlib.h>

#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wall" // -Weverything
int main(void)
{
     //exit(1);
     return 0;
}
#pragma clang diagnostic pop

Result:
$gcc -o main *.c -Wall -Wno-parentheses
main.c:4:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
  #pragma clang diagnostic push

main.c:5:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
  #pragma clang diagnostic warning "-Wall" // -Weverything

main.c:11:0: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
  #pragma clang diagnostic pop

$main


-- 
www.my-c-codes.com/

Farewell.

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Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-06 17:57 +0330
  Warning in LLVM Clang chad <cdalten@gmail.com> - 2020-01-06 07:47 -0800
  Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-06 15:58 +0000
    Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-07 15:32 +0330
      Which compiler is it, anyway??? (Was: Warning in LLVM Clang) gazelle@shell.xmission.com (Kenny McCormack) - 2020-01-07 12:58 +0000
      Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-07 14:33 +0000
        Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-08 16:35 +0330
          Re: Warning in LLVM Clang David Brown <david.brown@hesbynett.no> - 2020-01-08 15:11 +0100
            Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-09 16:15 +0330
              Re: Warning in LLVM Clang David Brown <david.brown@hesbynett.no> - 2020-01-09 14:34 +0100
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-09 17:49 +0330
                Re: Warning in LLVM Clang Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-09 19:35 +0000
                Re: Warning in LLVM Clang David Brown <david.brown@hesbynett.no> - 2020-01-10 10:28 +0100
                Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 12:39 +0000
                Re: Warning in LLVM Clang Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-10 12:57 +0000
                Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 13:23 +0000
                Re: Warning in LLVM Clang David Brown <david.brown@hesbynett.no> - 2020-01-10 14:09 +0100
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-10 16:45 +0330
                Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 13:20 +0000
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-10 17:20 +0330
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-10 17:24 +0330
                Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 23:52 +0000
                Re: Warning in LLVM Clang scott@slp53.sl.home (Scott Lurndal) - 2020-01-10 15:29 +0000
                Re: Warning in LLVM Clang Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 23:28 +0000
                Re: Warning in LLVM Clang Jorgen Grahn <grahn+nntp@snipabacken.se> - 2020-01-11 14:21 +0000
              Re: Warning in LLVM Clang James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-09 22:08 -0500
                Not exactly an "alias", but that's just being a CLC pedant... (Was: Warning in LLVM Clang) gazelle@shell.xmission.com (Kenny McCormack) - 2020-01-10 09:52 +0000
                Re: Not exactly an "alias", but that's just being a CLC pedant... (Was: Warning in LLVM Clang) David Brown <david.brown@hesbynett.no> - 2020-01-10 11:26 +0100
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-10 16:48 +0330
                Re: Warning in LLVM Clang Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-01-10 09:34 -0800
                Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-11 14:41 +0330
  Re: Warning in LLVM Clang Guillaume <message@bottle.org> - 2020-01-06 17:23 +0100
    Re: Warning in LLVM Clang Mehdi Amini <atorrses@gmail.com> - 2020-01-07 15:39 +0330

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