is -pedantic bad flag?

**Richard Heathfield** · Jun 27 '08, 07:42 PM

Re: is -pedantic bad flag?

new to c said:

Hi!
>
I write this code cos.c
>
#include <math.h>
#include <stdio.h>
>
int main(void)
{
double c;
c = cos(0);
printf("cos(0): %f\n", c);
return 0;
}
>
I compile normal and it work.

The code is fine.

I compile with -pedantic and it not work.
>
Is -pedantic bad flag?

Not in gcc, it isn't. The only diagnostic message I can persuade gcc to
emit for the above code is "warning: passing arg 1 of `cos' as floating
rather than integer due to prototype", and it does have a point, but it's
pretty clear that this isn't a showstopper.

Is code bug?

No, the code is fine.

>
I use lcc -pedantic cos.c and he warn
>
Error cos.c: c:\lcc\include\ math.h: 36 Syntax error; missing semicolon
before `_cosl'

Then you have a broken compiler. I suggest you switch to something that
works, such as gcc.

Is better not use -pedantic? People say -pedantic is good.

In gcc, it's fine. But then, gcc (when invoked with appropriate flags, of
which -pedantic is one) is a C compiler, which is always a good thing to
start with if you want to compile C programs.

--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999

**Martin Ambuhl** · Jun 27 '08, 07:42 PM

Re: is -pedantic bad flag?

new to c wrote:

Hi!
>
I write this code cos.c
>
#include <math.h>
#include <stdio.h>
>
int main(void)
{
double c;
c = cos(0);
printf("cos(0): %f\n", c);
return 0;
}
>
I compile normal and it work.
>
I compile with -pedantic and it not work.
>
Is -pedantic bad flag?

With a working compiler and a clean library using -pedantic (or its
equivalent) is a good thing. -pedantic with gcc will cause a problem
with the above.

>
Is code bug?

No.

>
I use lcc -pedantic cos.c and he warn

It seems that there is something wrong with the lcc implementation, then.

Error cos.c: c:\lcc\include\ math.h: 36 Syntax error; missing semicolon before `_cosl'

And this (and similar messages I have not quoted) suggests that the
error is either with the provided <math.hor with the compiler.

Is better not use -pedantic? People say -pedantic is good.

Normally, -pedantic is a good thing to use. It appears that using your
copy of lcc is a bad idea. It is possible that the current versions, or
even yours installed correctly, will not have this problem. Check the
lcc (or lcc-win32, if you're using Jacob's port) to make sure that you
have the latest copy and have installed it correctly. It those these
are true, then stop using lcc.

**Keith Thompson** · Jun 27 '08, 07:42 PM

Re: is -pedantic bad flag?

new to c <non@spam.inval idwrites:

I write this code cos.c
>
#include <math.h>
#include <stdio.h>
>
int main(void)
{
double c;
c = cos(0);
printf("cos(0): %f\n", c);
return 0;
}
>
I compile normal and it work.
>
I compile with -pedantic and it not work.
>
Is -pedantic bad flag?
>
Is code bug?
>
I use lcc -pedantic cos.c and he warn

[snip]

This is not a C language issue. You have a problem with lcc, or with
your installation of it.

The lcc compiler has its own newsgroup, comp.compilers. lcc. You
should post your question there. Please specify whether you're using
lcc or lcc-win (the latter is also known as lcc-win32), and which
version.

--
Keith Thompson (The_Other_Keit h) kst-u@mib.org <http://www.ghoti.net/~kst>
Nokia
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"

**Bartc** · Jun 27 '08, 07:42 PM

Re: is -pedantic bad flag?

"new to c" <non@spam.inval idwrote in message
news:1483075.id cC6GMIco@news.a ioe.org...

Hi!
>
I write this code cos.c
>
#include <math.h>
#include <stdio.h>
>
int main(void)
{
double c;
c = cos(0);
printf("cos(0): %f\n", c);
return 0;
}
>
I compile normal and it work.
>
I compile with -pedantic and it not work.
>
Is -pedantic bad flag?
>
Is code bug?
>
I use lcc -pedantic cos.c and he warn
>
Error cos.c: c:\lcc\include\ math.h: 36 Syntax error; missing semicolon
before `_cosl'

Notice all the errors are for the header file?

If you look at the math.h file, it uses special extensions like // comments
and _stdcall.

I would say there is a bug in this compiler because perhaps the -pedantic
flag should be ignored when compiling it's own system headers (when you port
your code elsewhere, you will use a different set of headers).

Either forget -pedantic when using math.h (or whatever else), or ignore the
warnings for this header, or switch compilers.

--
Bartc

**vippstar@gmail.com** · Jun 27 '08, 07:42 PM

Re: is -pedantic bad flag?

On Jun 21, 11:15 am, "Bartc" <b...@freeuk.co mwrote:

"new to c" <n...@spam.inva lidwrote in messagenews:148 3075.idcC6GMIco @news.aioe.org. ..
>
>
>

Hi!

>

I write this code cos.c

>

#include <math.h>
#include <stdio.h>

>

int main(void)
{
double c;
c = cos(0);
printf("cos(0): %f\n", c);
return 0;
}

>