The first thing you would want to do after you write a program is to check and see if it has any errors. There is a very effective and user friendly compiler called GNU C/C++ compiler/linker gcc. This utility is very helpful in finding out where your program has errors (especially when you have a coredump due to segmentation faults).
Generally, a large software system will consist of multiple programs, each of which uses multiple source files (MODULES) plus user and standard libraries. For example, a user's program may consist of n modules x1.c,x2.c, ..., xn.c.
To create an object from a C module x1.c (for c++ files use g++), use the command
gcc -c x1.c
If this command is successful then gcc will create and object file x1.o. (An object file is a file that contains linkable code plus symbol table information.)
If one of the n modules x1.c, ...., xn.c contains the ``main'' function, then we can create an executable from the object files as follows. (Here I assume that n=4.)
gcc x1.o x2.o x3.o x4.o
This will create the executable a.out. To create an executable named x, use the command
gcc -o x x1.o x2.o x3.o x4.o
More useful command-line options
Include debugging information into the object/executable. (Note that this must be done at both the object creation and linking stage.)
Generate all warning messages.
Perform more optimizations.
Perform even more optimizations.
Difference Between g++ and gcc:
G++ links to the necessary libraries to support C++ programs, while gcc is for straight C programs
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