is STL usable with gcc 3.0?

is STL usable with gcc 3.0?

[Brent Phillips]

Hi,

Sorry to send so much email to this list, but I've been having a really 
horrible with gcc 3.0...the latest is problems getting STL to work with gcc 
3.0. On my system (RedHat Linux, RedHat Linux 2.2.18), a basic "hello 
world" that uses STL crashes in a variety of ways. Take your basic "hello 
world" program...

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <vector>
int main(int argc, char** argv) {
   printf("hello world!\n");  exit(0);
}

compiled with default options ("gcc hello.cpp")...

1) adding the line

std::vector<int> myvector;

yields the error

/tmp/cctISmpm.o: In function `__FRAME_BEGIN__':
/tmp/cctISmpm.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

2) adding the line

vector<int> myvector;

yields the error

hello.cpp:7: 'vector' is used as a type, but is not defined as a type.

3) adding the lines

typedef std::vector<int> mytype_t;

mytype_t myvector;

yields the error

/tmp/cc2HrKVq.o: In function `__FRAME_BEGIN__':
/tmp/cc2HrKVq.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

Please advise...this is driving me insane!

thanks so much

Brent

Re: is STL usable with gcc 3.0?

[lange92]

Isn't the STL for C++??

On Thu, 16 Aug 2001, Brent Phillips wrote:

> ...the latest is problems getting STL to work with gcc
> 3.0. On my system (RedHat Linux, RedHat Linux 2.2.18), a basic "hello
> world" that uses STL crashes in a variety of ways. Take your basic "hello
> world" program...

<snip "neuter" code which cannot be distinguished between C and C++>

> yields the error
> /tmp/cctISmpm.o: In function `__FRAME_BEGIN__':
> /tmp/cctISmpm.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
> collect2: ld returned 1 exit status

"gxx" everywhere I've seen it referred to (makefiles, mostly) is talking
about C++.

further, the extension .cpp would suggest it's C++. Try "g++ hello.cpp".

Re: is STL usable with gcc 3.0?

[Alexandre Oliva]

On Aug 16, 2001, Brent Phillips <brent@lyrastudios.com> wrote:

> compiled with default options ("gcc hello.cpp")...

> 1) adding the line

> std::vector<int> myvector;

> yields the error

> /tmp/cctISmpm.o: In function `__FRAME_BEGIN__':
> /tmp/cctISmpm.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
> collect2: ld returned 1 exit status

Use g++ to link C++ code, so that libstdc++ is implicitly linked in.
Some C++-specific symbols that used to be in libgcc were moved to
libstdc++ in GCC 3.0.

> 2) adding the line

> vector<int> myvector;

> yields the error

> hello.cpp:7: 'vector' is used as a type, but is not defined as a type.

std:: is significant in GCC 3.0, and <vector> declares only
std::vector, unlike <vector.h>, that brings std::vector into the
global namespace.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

Re: is STL usable with gcc 3.0?

[bley]

| Hi,
| Sorry to send so much email to this list, but I've been having a really 
| horrible with gcc 3.0...the latest is problems getting STL to work with gcc 
| 3.0. On my system (RedHat Linux, RedHat Linux 2.2.18), a basic "hello 
| world" that uses STL crashes in a variety of ways. Take your basic "hello 
| world" program...
| 
| #include <stdio.h>
| #include <stdlib.h>
| #include <unistd.h>
| #include <vector>
| int main(int argc, char** argv) {
|    printf("hello world!\n");  exit(0);
| }
| 
| compiled with default options ("gcc hello.cpp")...
|
| 1) adding the line
| 
| std::vector<int> myvector;
| 
| yields the error
| 
| /tmp/cctISmpm.o: In function `__FRAME_BEGIN__':
| /tmp/cctISmpm.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
| collect2: ld returned 1 exit status
 
As a rule of thumb if you intend to compile C++ code, just use the g++
wrapper to compile your code since it is actually necessary to link
code utilizing containers/algorithms etc. of the STL because it links
in the standard C++ library and generally speaking just takes care of
passing the appropriate options to the compiler and linker. If you're
just using 'gcc hello.cpp' at least '-lstdc++' is missing from the
linker options. (`__gxx_personality_v0' is defined in libstdc++)

Next, if you're writing C++ code, it is encouraged to use a special
naming scheme when including headers:

If you're including C headers use '#include <cX>' instead of '#include <X.h>', 
if you're including C++ headers just use '#include <X>'.

This way you will avoid annoying warning messages.

| 2) adding the line
| 
| vector<int> myvector;
| 
| yields the error
| 
| hello.cpp:7: 'vector' is used as a type, but is not defined as a type.

'vector' is declared in the namespace 'std' and you have to specify
the namespace, otherwise it won't work...

| 3) adding the lines
| 
| typedef std::vector<int> mytype_t;
| 
| mytype_t myvector;
| 
| yields the error
| 
| /tmp/cc2HrKVq.o: In function `__FRAME_BEGIN__':
| /tmp/cc2HrKVq.o(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
| collect2: ld returned 1 exit status
| 
| Please advise...this is driving me insane!
| 
| thanks so much
| 
| Brent

Claudio