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The commands of process of compiling a c++ file

(1)

vim ex14-7.c

(2)

#include <iostream>

#include <stdio.h>

using namespace std;

class myclass{

public:

static int a;

int b;

};

int myclass::a = 5;

int main() {

myclass obj1, *ptr;

ptr = &obj1;

cout << "\nmyclass::a = " << a = " << obj1.a << "ptr->a = " << ptr->a;

myclass::a = myclass::a + 1;

cout << "\nmyclass::a = " << a = " << obj1.a << "ptr->a = " << ptr->a;

obj1.a = obj1.a + 1;

cout << "\nmyclass::a = " << a = " << obj1.a << "ptr->a = " << ptr->a;

ptr->a = ptr->a + 1;

cout << "\nmyclass::a = " << a = " << obj1.a << "ptr->a = " << ptr->a;

getchar();

}

(3)

g++ ex14-7.c -o ex14-7

(4)

./ex14-7

For Ubuntu 9.10 (karmic), you may encounter this error in the linking of otcl:

-------------------------------------------------------------------------
otcl.o: In function `OTclDispatch':
/home/ns/ns-allinone-2.34/otcl/otcl.c:495: undefined reference to `__stack_chk_fail_local'
otcl.o: In function `Otcl_Init':
/home/ns/ns-allinone-2.34/otcl/otcl.c:2284: undefined reference to `__stack_chk_fail_local'
ld: libotcl.so: hidden symbol `__stack_chk_fail_local' isn't defined
ld: final link failed: Nonrepresentable section on output
make: *** [libotcl.so] Error 1
-------------------------------------------------------------------------


This error is because the linker being used is "ld -shared" instead of "gcc -shared". If you edit one line in otcl-1.13/configure, and rerun install, it should work:

--------------------------------------------------------------------------
--- configure.orig 2009-11-02 12:14:52.556167945 -0800
+++ configure 2009-11-02 12:17:28.966706099 -0800
@@ -6301,7 +6301,7 @@
;;
Linux*)
SHLIB_CFLAGS="-fpic"
- SHLIB_LD="ld -shared"
+ SHLIB_LD="gcc -shared"
SHLIB_SUFFIX=".so"
DL_LIBS="-ldl"
SHLD_FLAGS=""
-------------------------------------------------------------------------

reference:http://nsnam.isi.edu/nsnam/index.php/User_Information