Compile C, C++, Objective-C, Ada, Fortran, Java, Or Treelang - Red Hat ENTERPRISE LINUX 3 - USING GCC Using Instructions

Chapter 2.
Compile C, C++, Objective-C, Ada, Fortran,
Java, or treelang
Several versions of the compiler (C, C++, Objective-C, Ada, Fortran, Java and treelang) are integrated;
this is why we use the name "GNU Compiler Collection". GCC can compile programs written in any
of these languages. The Ada, Fortran, Java and treelang compilers are described in separate manuals.
"GCC" is a common shorthand term for the GNU Compiler Collection. This is both the most general
name for the compiler, and the name used when the emphasis is on compiling C programs (as the
abbreviation formerly stood for "GNU C Compiler").
When referring to C++ compilation, it is usual to call the compiler "G++". Since there is only one
compiler, it is also accurate to call it "GCC" no matter what the language context; however, the term
"G++" is more useful when the emphasis is on compiling C++ programs.
Similarly, when we talk about Ada compilation, we usually call the compiler "GNAT", for the same
reasons.
We use the name "GCC" to refer to the compilation system as a whole, and more specifically to
the language-independent part of the compiler. For example, we refer to the optimization options as
affecting the behavior of "GCC" or sometimes just "the compiler".
Front ends for other languages, such as Mercury and Pascal exist but have not yet been integrated into
GCC. These front ends, like that for C++, are built in subdirectories of GCC and link to it. The result
is an integrated compiler that can compile programs written in C, C++, Objective-C, or any of the
languages for which you have installed front ends.
In this manual, we only discuss the options for the C, Objective-C, and C++ compilers and those of the
GCC core. Consult the documentation of the other front ends for the options to use when compiling
programs written in other languages.
G++ is a compiler, not merely a preprocessor. G++ builds object code directly from your C++ pro-
gram source. There is no intermediate C version of the program. (By contrast, for example, some
other implementations use a program that generates a C program from your C++ source.) Avoiding
an intermediate C representation of the program means that you get better object code, and better
debugging information. The GNU debugger, GDB, works with this information in the object code to
give you comprehensive C++ source-level editing capabilities ().