Steps in compiling a c++ program in LINUX

Posted on 2000-02-23
Last Modified: 2010-04-22
My Context:
I have learned ANSI C++ in the Codewarrior IDE on windows.
I run a Mandrake LINUX but am thinking of going to Slackware
(its been mentioned as a good learning source)

My Question:
How do I get from a source/header files to an executable?

(how do I run the compiler, is it always present
 Is there a directory I need to be in, where will my files end up
 Is there an IDE for LINUX, and anything else I need to code . . . )

Question by:rhik
  • 2

Accepted Solution

mattrope earned 50 total points
ID: 2553124
Linux generally comes with g++, which is the Gnu C++ compiler.  To compile a program with just a couple of files, you could do this:

g++ -o desired_final_executable_name file1.C file2.C . . .

For large programs, it is better to compile the .C files separately into object (.o) files and then link the object files together.  This can be done as follows:

g++ -c file1.C          (creates file1.o)
g++ -c file2.C          (creates file2.o)

g++ -o final_executable_name file1.o file2.o . . .

Obviously typing each of these commands each time you want to compile and test your program would be very tedious, so it is possible to create a file called a "Makefile" which contains all the dependency information for your project and specifies exactly what files are needed to build the final executable.  The syntax of makefiles is too complex to post here, but you can find lots of info on the Internet.  Basically having a makefile allows you to type "make" and your computer will figure out which source files have changed, only recompile the ones necessary, and build the final executable.

Hope this is what you were looking for...

Author Comment

ID: 2560127
#include <iostream>
#include <string.h>
void main()
      cout <<"hello world";

the above  gives me an error.
" Parse error before '}' "

Expert Comment

ID: 2681322
The standard library is defined in a namespace called standard. So, your code should read either:

#include <iostream>
#include <string.h>
void main()
std::cout <<"hello world";

or (better)

#include <iostream>
#include <string>
using namespace std;

void main()
cout <<"hello world";

(Stroustrup, C++ Programming Language, Special Edition, pg. 46,47)

I don't see why you should include string or string.h in the above.

Note that it's supposed to be:
int main()
but I don't think this will cause your compiler to report an error. Still, stick to int and return a value to the system (zero if everything goes fine).

Author Comment

ID: 2790388
Thankyou and good answer.

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