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Warnings when trying to compile in C++

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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Tue 12 Dec 2006 09:09 PM (UTC)  [ quote  ]
Message
I got this warning.

changes.c: In function `char * current_date()':
changes.c:81: warning: `%x' yields only last 2 digits of year in some locales


the line is this...

 strftime( buf, 128, "%x", datetime );


Not all to familiar with this, but I'm just trying to clean it up, and dont know whats wrong?
Everything turns around in the end
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Posted by Zeno   USA  (2,867 posts)  [Biography] bio   Moderator
Date Reply #1 on Tue 12 Dec 2006 10:11 PM (UTC)  [ quote  ]
Message
Just a warning. It's saying that in certain locales, the last 2 digits of the year will be displayed instead of 4.
Zeno McDohl,
Owner of Bleached InuYasha Galaxy
http://www.biyg.org
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #2 on Tue 12 Dec 2006 10:28 PM (UTC)  [ quote  ]
Message
right but using smaugfuss 1.7 all warnings are treated as errors. And I'd like to get this cleaned up.
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Posted by David Haley   USA  (3,881 posts)  [Biography] bio   Moderator
Date Reply #3 on Tue 12 Dec 2006 10:31 PM (UTC)  [ quote  ]
Message
See man strftime section BUGS. That might help you, although it's for %c, not %x.
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone

http://david.the-haleys.org
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #4 on Tue 12 Dec 2006 10:32 PM (UTC)  [ quote  ]

Amended on Tue 12 Dec 2006 10:34 PM (UTC) by Metsuro

Message
I didn't actually write that part, I just use it heh.
char * current_date( )
{
    static char buf [ 128 ];
    struct tm * datetime;

    datetime = localtime( &current_time );
    strftime( buf, 128, "%x", datetime );
    return buf;
}

It just is suppose to get the current date, not the time, so It can be used to display in the change.
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Posted by Zeno   USA  (2,867 posts)  [Biography] bio   Moderator
Date Reply #5 on Tue 12 Dec 2006 11:09 PM (UTC)  [ quote  ]
Message
You should be able to change it so that warnings will still compile. Check the Makefile.
Zeno McDohl,
Owner of Bleached InuYasha Galaxy
http://www.biyg.org
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Posted by David Haley   USA  (3,881 posts)  [Biography] bio   Moderator
Date Reply #6 on Tue 12 Dec 2006 11:21 PM (UTC)  [ quote  ]
Message
Did you try the workaround proposed in man strftime?
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone

http://david.the-haleys.org
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #7 on Tue 12 Dec 2006 11:52 PM (UTC)  [ quote  ]
Message
I didn't see an bug section in the man. all I saw was all the options and such. And I'd rather not just leave it, I like trying to be neat as possible.
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Posted by Zeno   USA  (2,867 posts)  [Biography] bio   Moderator
Date Reply #8 on Wed 13 Dec 2006 12:13 AM (UTC)  [ quote  ]
Message
A little odd. Here's what I have:
char * current_date( ) 
{ 
    static char buf [ 128 ];
    struct tm * datetime;

    datetime = localtime( &current_time );
    strftime( buf, sizeof( buf ), "%x", datetime );
    return buf;
}


Yet I don't get a compile warning.


Here's the bug section from the man page:
Quote:
BUGS
Some buggy versions of gcc complain about the use of %c: warning: '%c' yields only last 2 digits of year in
some locales. Of course programmers are encouraged to use %c, it gives the preferred date and time representa-
tion. One meets all kinds of strange obfuscations to circumvent this gcc problem. A relatively clean one is to
add an intermediate function
size_t my_strftime(char *s, size_t max, const char *fmt, const struct tm *tm) {
return strftime(s, max, fmt, tm);
}
Zeno McDohl,
Owner of Bleached InuYasha Galaxy
http://www.biyg.org
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #9 on Wed 13 Dec 2006 12:34 AM (UTC)  [ quote  ]
Message
Well I got around that problem it seems that my_strftime was already put in... but was never really ever used... but now I have this further on.

hometowns.c:326: initialization to `char *' from `const char *' discards qualifiers
I had a few more of these and I added const and it fixed it.
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #10 on Wed 13 Dec 2006 12:57 AM (UTC)  [ quote  ]
Message
OK nevermind I fixed that... but now.. I get this interesting mess...

o/track.o(.bss+0x0): In function `valid_edge(exit_data *)':
/usr/users/mud/aesdyn/Current/src/track.c:46: multiple definition of `hometown_list'
o/imc.o(.bss+0x131a0):/usr/users/mud/aesdyn/Current/src/imc.c:6819: first defined here
o/track.o(.bss+0x40): In function `bfs_enqueue(room_index_data *, char)':
/usr/users/mud/aesdyn/Current/src/track.c:61: multiple definition of `nation_list'
o/imc.o(.bss+0x131e0):/usr/users/mud/aesdyn/Current/src/imc.c:6823: first defined here
o/update.o(.bss+0x20): In function `neighbor_data type_info function':
/usr/users/mud/aesdyn/Current/src/update.c: multiple definition of `hometown_list'
o/imc.o(.bss+0x131a0):/usr/users/mud/aesdyn/Current/src/imc.c:6819: first defined here
o/update.o(.bss+0x60): In function `neighbor_data type_info function':
/usr/users/mud/aesdyn/Current/src/update.c: multiple definition of `nation_list'
o/imc.o(.bss+0x131e0):/usr/users/mud/aesdyn/Current/src/imc.c:6823: first defined here
collect2: ld returned 1 exit status


this is the end of the list, but... I have no idea what this all means.
Everything turns around in the end
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Posted by David Haley   USA  (3,881 posts)  [Biography] bio   Moderator
Date Reply #11 on Wed 13 Dec 2006 01:35 AM (UTC)  [ quote  ]
Message
You are probably defining those in a .h file, without externing them. If you put, say, int foo; into a .h file and include it in several .c files, you will get that error. The solution is to put extern int foo; in the .h, and int foo; in one and only one C file.
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone

http://david.the-haleys.org
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #12 on Wed 13 Dec 2006 02:33 AM (UTC)  [ quote  ]
Message
Well that cut the list down to like... half...
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #13 on Wed 13 Dec 2006 02:35 AM (UTC)  [ quote  ]
Message
Uh, nevermind... I got it... thanks!
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Posted by Metsuro   USA  (389 posts)  [Biography] bio
Date Reply #14 on Wed 13 Dec 2006 07:59 AM (UTC)  [ quote  ]
Message
Not... exactly the same problem but I still dont know what exactly this means... or how to fix it.

act_info.c:5498: warning: 'lcost' might be used uninitialized in this function

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