Re: [bug-gawk] Gawk compile error Mingw32

[Vincent Belaïche]

Answers below.

Le 22/12/2016 à 18:46, Eli Zaretskii a écrit :
>> From: address@hidden (Vincent Belaïche)
>> Cc: Vincent Belaïche <address@hidden> ,address@hidden, address@hidden
>> Date: Wed, 21 Dec 2016 17:13:45 +0100
>>
>>  $ c:/Users/Vincent/Downloads/gawk-4.1.4-w32-bin/bin/gawk.exe 
>> 'END{exit(-1);}' dummy_file.txt; echo $?
>> -| 0
>>  $ c:/Users/Vincent/Downloads/gawk-4.1.4-w32-bin/bin/gawk.exe 
>> 'END{exit(1);}' dummy_file.txt; echo $?
>> -| 1
>>  $ /bin/gawk-3.1.7.exe 'END{exit(-1);}' dummy_file.txt; echo $?
>> -| 255
>>  $ /bin/gawk-3.1.7.exe 'END{exit(1);}' dummy_file.txt; echo $?
>> -| 1
>> --8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----
>>
>> Eli's port gawk.exe version 4.1.4 give exit status 0 when meeting
>>
>> --8<----8<----8<----8<----8<-- begin -->8---->8---->8---->8---->8----
>> END{ exit(-1); }
>> --8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----
>>
>> while MSYS gawk version 3.1.7 gives 255 in that case.
>
> I cannot reproduce this:
>
>   D:\gnu\gawk-4.1.4>gawk "END {exit(-1);}" empty_file
>
>   D:\gnu\gawk-4.1.4>echo %ERRORLEVEL%
>   -1
>
> Are you running this from some Bash?  If so, it's the problem with the
> shell you use: it tries to interpret the -1 value in the Unixy way of
> taking just the high 8 bits or somesuch.
>

You are fully right. I did the same trial under an MSDOS console, and
there was not any such issue. I couldn't have ever imagine that the
shell was the one to blame.

> The code in Gawk where we end up when processing the 'exit' statement
> is very simple:
>
>   void
>   final_exit(int status)
>   {
>         /* run any extension exit handlers */
>         run_ext_exit_handlers(status);
>
>         /* we could close_io() here */
>         close_extensions();
>
>         exit(status);
>   }

I did the following even simpler experiment:

--8<----8<----8<----8<----8<-- begin -->8---->8---->8---->8---->8----
// doexit.cpp
#include <cstdio>
#include <cstdlib>

int main(int ac,char const*av[]){
  if(ac != 2){
    fprintf(stderr,"doexit Expects 1 argument !\n");
    return -1;
  }
  int exit_status = atoi(av[1]);
  return exit_status;
}

// Local Variables:
// compile-command: "gcc doexit.cpp -o doexit.exe"
// End:
--8<----8<----8<----8<----8<--  end  -->8---->8---->8---->8---->8----

I get the same thing as with gawk.exe when I do

  doexit -1; echo $?

I get 0 under bash and when I do

  doexit -1
  echo %ERRORLEVEL%

then I get -1 under MSDOS console.

>
> and there's nothing on MSDN about any funky interpretation of negative
> return values by the MS runtime.

Sorry for the disturbance. Bye.

  Vincent.

---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel 
antivirus Avast.
https://www.avast.com/antivirus