Using gcc

Using gcc

[charles scott]

Hello,

I am new to GNU CC and I have version gcc 3.0.1 running on Solaris 8. 
 The package seemed to install okay and I added the  /usr/local/bin 
directory to my path however, when I compile my c++ program it returns 
the following message:

                    `main' must return `int'  

Here is the code.

#include <iostream.h>

void main()
{
       long   number = 0;
       cout <<  "This is a test. "  <<  number   <<   endl;
}

Is there a place where I get some sample c++ code that will compile to 
test my install?

Thanks for your assistance.

Re: Using gcc

[Claudio Bley]

>>>>> " " == charles scott <cpscott@nsu.edu> writes:

     > Hello, I am new to GNU CC and I have version gcc 3.0.1 running on
     > Solaris 8.  The package seemed to install okay and I added the
     > /usr/local/bin directory to my path however, when I compile my c++
     > program it returns the following message:

     >                     `main' must return `int'

     > Here is the code.

     > #include <iostream.h>

     > void main() 
     > { 
     >      long number = 0; 
     >      cout << "This is a test. "  << number << endl;
     > }

     > Is there a place where I get some sample c++ code that will compile
     > to test my install?

     > Thanks for your assistance.

Just do what the compiler suggests/dictates!

#include <iostream>           /* include C++ header files without .h */

int main ()                   /* `main' must return `int' !! */
{
    using namespace std;      /* cout is declared in namespace std */

    long number = 0;
    cout << "This is a test. "  << number << endl;

    return 0;
}


Claudio

Re: Using gcc

[홍근식]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 821 bytes --]

is ansi C
> Hello,
> 
> I am new to GNU CC and I have version gcc 3.0.1 running on Solaris 8. 
>  The package seemed to install okay and I added the  /usr/local/bin 
> directory to my path however, when I compile my c++ program it returns 
> the following message:
> 
>                     `main' must return `int'  
> 
> Here is the code.
> 
> #include <iostream.h>
> 
> void main()
> {
>        long   number = 0;
>        cout <<  "This is a test. "  <<  number   <<   endl;
> }
> 
> Is there a place where I get some sample c++ code that will compile to 
> test my install?
> 
> Thanks for your assistance.


-- 
°­ÇÏ°í ¾Æ¸§´Ù¿î ¸®´ª½º 
<a href=" http://darkstar.kslp.org" ;> http://darkstar.kslp.org </a>
<a href=" http://kslp.org" ;> http://kslp.org </a>

Using gcc

[Francisco Mendez]

Hi:
I'm totaly new to c programming, I'm using Red Hat 7.2. Recently I got 
the book "Practical C Programming" by Steve Oualline (O'Reilly). In Ch-2 
a simple Hello World program is described,
[File: hello/hello.c]
#include <stdio.h>
int main()
{
   printf("Hello World\n");
   return(0);
}

The file is saved as hello.c

, following are the instructions for compiling from the command line:
   gcc -g -Wall -ohello hello.c

The sample fails to compile, unstead I get the following Messages:
hello.c:1: parse error before '['
In file included from usr/include/bits/types.h:143,
                         from usr/include/stdio.h:36,
                         from hello.c:2:
usr/include/bits/pthreadtypes.h:48: parse error before 'size_t'
usr/include/bits/pthreadtypes.h:48: warning: no semicolon at end  of 
structure union
usr/include/bits/pthreadtypes.h:51: parse error before '__stacksize'
usr/include/bits/pthreadtypes.h:51: warning: data definition has no type 
or storage class
usr/include/bits/pthreadtypes.h:52: warning: data definition has no type 
or storage class
In file included from usr/include/_G_config.h:44;
                         from usr/include/libio.h:32,
                         from usr/include/stdio.h:65,
                         from hello.c:2:
usr/include/gconv.h:72: parse error before 'size_t'
usr/include/gconv.h:85: parse error before 'size_t'
usr/include/gconv.h:94: parse error before 'size_t'
usr/include/gconv.h:170: parse error before 'size_t'
usr/include/gconv.h:170: warning: no semicolon at end of struct or union
usr/include/gconv.h:173: parse error before '}'
usr/include/gconv.h:173: warning: data definition has no type or storage 
class
In file included from usr/include/libio.h:32,
                         from usr/include/libio.h:65,
                         from hello.c:2:
usr/include/_G_config.h:47: field '__cd' has incomplete type
usr/include/_G_config.h:50: field '__cd' has incomplete type
usr/include/_G_config.h:53: confused by earlier errors, bailing out

So it seems impossible to compile this simple programm. Whatis wrong?

Any help in this respect will be appreciated. Thanks in advance.

Francisco Mendez.

RE: Using gcc

[Mariappan, MaharajanX]

a simple Hello World program is described,
[File: hello/hello.c]

Is the above line is a part of ur fil? if so remove it or put as the inline
comment like below,
/* [File: hello/hello.c] */


- Maharajan

RE: Using gcc

[Thai Dang Vu]

Have you tried 

gcc -g -Wall -o hello hello.c

yet?
Attention: there's a space between -o and hello.

-----Original Message-----
From: Francisco Mendez [mailto:iframe@prodigy.net.mx]
Sent: Friday, March 29, 2002 11:29 AM
To: gcc-help@gcc.gnu.org
Subject: Using gcc


Hi:
I'm totaly new to c programming, I'm using Red Hat 7.2. Recently I got 
the book "Practical C Programming" by Steve Oualline (O'Reilly). In Ch-2

a simple Hello World program is described,
[File: hello/hello.c]
#include <stdio.h>
int main()
{
   printf("Hello World\n");
   return(0);
}

The file is saved as hello.c

, following are the instructions for compiling from the command line:
   gcc -g -Wall -ohello hello.c

The sample fails to compile, unstead I get the following Messages:
hello.c:1: parse error before '['
In file included from usr/include/bits/types.h:143,
                         from usr/include/stdio.h:36,
                         from hello.c:2:
usr/include/bits/pthreadtypes.h:48: parse error before 'size_t'
usr/include/bits/pthreadtypes.h:48: warning: no semicolon at end  of 
structure union
usr/include/bits/pthreadtypes.h:51: parse error before '__stacksize'
usr/include/bits/pthreadtypes.h:51: warning: data definition has no type

or storage class
usr/include/bits/pthreadtypes.h:52: warning: data definition has no type

or storage class
In file included from usr/include/_G_config.h:44;
                         from usr/include/libio.h:32,
                         from usr/include/stdio.h:65,
                         from hello.c:2:
usr/include/gconv.h:72: parse error before 'size_t'
usr/include/gconv.h:85: parse error before 'size_t'
usr/include/gconv.h:94: parse error before 'size_t'
usr/include/gconv.h:170: parse error before 'size_t'
usr/include/gconv.h:170: warning: no semicolon at end of struct or union
usr/include/gconv.h:173: parse error before '}'
usr/include/gconv.h:173: warning: data definition has no type or storage

class
In file included from usr/include/libio.h:32,
                         from usr/include/libio.h:65,
                         from hello.c:2:
usr/include/_G_config.h:47: field '__cd' has incomplete type
usr/include/_G_config.h:50: field '__cd' has incomplete type
usr/include/_G_config.h:53: confused by earlier errors, bailing out

So it seems impossible to compile this simple programm. Whatis wrong?

Any help in this respect will be appreciated. Thanks in advance.

Francisco Mendez.

Using gcc

[jjwdeck]

	It has been a long time since I compiled anything on Linux.  When I attempted to compile the following program with gcc (ver 3.3.4-13 on a Debian’s Sarge).  It resulted in the error below.  

Program:
// test compile
#include	<stdio.h>

int	main(void) {
	printf("Hello World\n") ;
} 

Compiler/Linker error:
/tmp/cc0Ke0PP.o(.eh_frame+0x11): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

	Checking the documentation for a version of gcc close to this one gave me now clue as to how to resolve the linker error.  I ended up searching  /usr/lib for __gxx_personality_v0 to find libstdc++.a which so happened to define the reference.  Where do I find documentation that will tell me how to get started doing a compile in this situation?  Also what is this 'personality' type of name the linker needs?  

	Sincerely,
	jjwdeck



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Re: Using gcc

[Brian Dessent]

"jjwdeck@juno.com" wrote:

>         Checking the documentation for a version of gcc close to this one gave me now clue as to how to resolve the linker error.  I ended up searching  /usr/lib for __gxx_personality_v0 to find libstdc++.a which so happened to define the reference.  Where do I find documentation that will tell me how to get started doing a compile in this situation?  Also what is this 'personality' type of name the linker needs?

You shouldn't have to specify any of that kind of junk.  It should just
work.  But you didn't include the exact command(s) you used to compile
and link and without that info it's pretty hard to assist you.

The kind of error that you're seeing is often caused by trying to link
by calling 'ld' directly instead of using the 'gcc' command, or trying
to link C++ code by calling 'gcc' instead of 'g++'.  You should always
link with 'gcc', unless you have any C++ code in which case you should
compile and link with 'g++'.  By doing this the necessary internal
library bits will always be added automatically.

Brian