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study/Ref-docs/manual gcc2.95.3/gcc_1.html
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study/Ref-docs/manual gcc2.95.3/gcc_1.html
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<HTML>
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Created on March, 17 2001 by texi2html 1.64 -->
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<!--
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Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
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Karl Berry <karl@freefriends.org>
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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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and many others.
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Maintained by: Olaf Bachmann <obachman@mathematik.uni-kl.de>
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Send bugs and suggestions to <texi2html@mathematik.uni-kl.de>
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-->
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<HEAD>
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<TITLE>Using and Porting the GNU Compiler Collection (GCC): G++ and GCC</TITLE>
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<META NAME="description" CONTENT="Using and Porting the GNU Compiler Collection (GCC): G++ and GCC">
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<META NAME="keywords" CONTENT="Using and Porting the GNU Compiler Collection (GCC): G++ and GCC">
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<BODY LANG="" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#800080" ALINK="#FF0000">
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<A NAME="SEC1"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc.html#SEC_Top" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc.html#SEC_Top"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_2.html#SEC2" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_2.html#SEC2"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc.html#SEC_Top" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc.html#SEC_Top"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_2.html#SEC2" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_2.html#SEC2"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc.html#SEC_Top" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_toc.html#SEC_Contents" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_24.html#SEC261" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_24.html#SEC261">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_abt.html#SEC_About" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<A NAME="G++ and GCC"></A>
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<H1> 1. Compile C, C++, Objective C, or Fortran </H1>
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<!--docid::SEC1::-->
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<P>
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<A NAME="IDX2"></A>
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The C, C++, and Objective C, and Fortran versions of the compiler are
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integrated; this is why we use the name "GNU Compiler Collection".
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GCC can compile programs written in C, C++, Objective C, or Fortran.
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The Fortran compiler is described in a separate manual.
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</P><P>
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<A NAME="IDX3"></A>
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"GCC" is a common shorthand term for the GNU Compiler Collection. This is both
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the most general name for the compiler, and the name used when the
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emphasis is on compiling C programs (as the abbreviation formerly
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stood for "GNU C Compiler").
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</P><P>
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<A NAME="IDX4"></A>
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<A NAME="IDX5"></A>
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When referring to C++ compilation, it is usual to call the compiler
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"G++". Since there is only one compiler, it is also accurate to call
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it "GCC" no matter what the language context; however, the term
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"G++" is more useful when the emphasis is on compiling C++ programs.
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</P><P>
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We use the name "GCC" to refer to the compilation system as a
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whole, and more specifically to the language-independent part of the
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compiler. For example, we refer to the optimization options as
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affecting the behavior of "GCC" or sometimes just "the compiler".
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</P><P>
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Front ends for other languages, such as Ada 9X, Fortran, Modula-3, and
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Pascal, are under development. These front-ends, like that for C++, are
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built in subdirectories of GCC and link to it. The result is an
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integrated compiler that can compile programs written in C, C++,
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Objective C, or any of the languages for which you have installed front
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ends.
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</P><P>
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In this manual, we only discuss the options for the C, Objective-C, and
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C++ compilers and those of the GCC core. Consult the documentation
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of the other front ends for the options to use when compiling programs
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written in other languages.
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</P><P>
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<A NAME="IDX6"></A>
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<A NAME="IDX7"></A>
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<A NAME="IDX8"></A>
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G++ is a <EM>compiler</EM>, not merely a preprocessor. G++ builds object
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code directly from your C++ program source. There is no intermediate C
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version of the program. (By contrast, for example, some other
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implementations use a program that generates a C program from your C++
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source.) Avoiding an intermediate C representation of the program means
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that you get better object code, and better debugging information. The
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GNU debugger, GDB, works with this information in the object code to
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give you comprehensive C++ source-level editing capabilities
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(see section `C and C++' in <CITE>Debugging with GDB</CITE>).
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</P><P>
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<A NAME="Invoking GCC"></A>
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<HR SIZE="6">
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[ << ]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_2.html#SEC2" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_2.html#SEC2"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc.html#SEC_Top" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc.html#SEC_Top">Top</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_toc.html#SEC_Contents" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_24.html#SEC261" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_24.html#SEC261">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gcc_abt.html#SEC_About" tppabs="http://gcc.gnu.org/onlinedocs/gcc-2.95.3/gcc_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<BR>
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<FONT SIZE="-1">
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This document was generated
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by <I>GCC Administrator</I> on <I>March, 17 2001</I>
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using <A HREF="tppmsgs/msgs0.htm#1" tppabs="http://www.mathematik.uni-kl.de/~obachman/Texi2html"><I>texi2html</I></A>
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