636 lines
18 KiB
Groff
636 lines
18 KiB
Groff
|
.\" Copyright (c) 1991, 1992 Free Software Foundation -*-Text-*-
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.\" See section COPYING for conditions for redistribution
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.\" FIXME: no info here on predefines. Should there be? extra for C++...
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.TH G++ 1 "30apr1993" "GNU Tools" "GNU Tools"
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.de BP
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.sp
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.ti \-.2i
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\(**
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..
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.SH NAME
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g++ \- GNU project C++ Compiler (v2.4)
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.SH SYNOPSIS
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.RB g++ " [" \c
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.IR option " | " filename " ].\|.\|.
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.SH DESCRIPTION
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The C and C++ compilers are integrated;
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.B g++
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is a script to call
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.B gcc with options to recognize C++.
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.B gcc
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processes input files
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through one or more of four stages: preprocessing, compilation,
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assembly, and linking. This man page contains full descriptions for
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.I only
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C++ specific aspects of the compiler, though it also contains
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summaries of some general-purpose options. For a fuller explanation
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of the compiler, see
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.BR gcc ( 1 ).
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C++ source files use one of the suffixes `\|\c
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.B .C\c
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\&\|', `\|\c
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.B .cc\c
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\&\|', or `\|\c
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.B .cxx\c
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\&\|'; preprocessed C++ files use the suffix `\|\c
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.B .ii\c
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\&\|'.
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.SH OPTIONS
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There are many command-line options, including options to control
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details of optimization, warnings, and code generation, which are
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common to both
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.B gcc
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and
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.B g++\c
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\&. For full information on all options, see
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.BR gcc ( 1 ).
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Options must be separate: `\|\c
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.B \-dr\c
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\&\|' is quite different from `\|\c
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.B \-d \-r
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\&\|'.
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Most `\|\c
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.B \-f\c
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\&\|' and `\|\c
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.B \-W\c
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\&\|' options have two contrary forms:
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.BI \-f name
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and
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.BI \-fno\- name\c
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\& (or
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.BI \-W name
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and
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.BI \-Wno\- name\c
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\&). Only the non-default forms are shown here.
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.TP
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.B \-c
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Compile or assemble the source files, but do not link. The compiler
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output is an object file corresponding to each source file.
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.TP
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.BI \-D macro
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Define macro \c
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.I macro\c
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\& with the string `\|\c
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.B 1\c
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\&\|' as its definition.
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.TP
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.BI \-D macro = defn
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Define macro \c
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.I macro\c
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\& as \c
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.I defn\c
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\&.
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.TP
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.B \-E
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Stop after the preprocessing stage; do not run the compiler proper. The
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output is preprocessed source code, which is sent to the
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standard output.
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.TP
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.B \-fall\-virtual
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Treat all possible member functions as virtual, implicitly. All
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member functions (except for constructor functions and
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.B new
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or
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.B delete
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member operators) are treated as virtual functions of the class where
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they appear.
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This does not mean that all calls to these member functions will be
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made through the internal table of virtual functions. Under some
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circumstances, the compiler can determine that a call to a given
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virtual function can be made directly; in these cases the calls are
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direct in any case.
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.TP
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.B \-fdollars\-in\-identifiers
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Permit the use of `\|\c
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.B $\c
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\&\|' in identifiers.
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Traditional C allowed the character `\|\c
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.B $\c
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\&\|' to form part of identifiers; by default, GNU C also
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allows this. However, ANSI C forbids `\|\c
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.B $\c
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\&\|' in identifiers, and GNU C++ also forbids it by default on most
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platforms (though on some platforms it's enabled by default for GNU
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C++ as well).
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.TP
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.B \-felide\-constructors
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Use this option to instruct the compiler to be smarter about when it can
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elide constructors. Without this flag, GNU C++ and cfront both
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generate effectively the same code for:
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.sp
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.br
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A\ foo\ ();
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.br
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A\ x\ (foo\ ());\ \ \ //\ x\ initialized\ by\ `foo\ ()',\ no\ ctor\ called
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.br
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A\ y\ =\ foo\ ();\ \ \ //\ call\ to\ `foo\ ()'\ heads\ to\ temporary,
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.br
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\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ //\ y\ is\ initialized\ from\ the\ temporary.
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.br
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.sp
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Note the difference! With this flag, GNU C++ initializes `\|\c
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.B y\c
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\&\|' directly
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from the call to
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.B foo ()
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without going through a temporary.
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.TP
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.B \-fenum\-int\-equiv
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Normally GNU C++ allows conversion of
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.B enum
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to
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.B int\c
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\&, but not the other way around. Use this option if you want GNU C++
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to allow conversion of
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.B int
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to
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.B enum
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as well.
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.TP
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.B \-fno\-gnu\-linker
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Do not output global initializations (such as C++ constructors and
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destructors) in the form used by the GNU linker (on systems where the GNU
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linker is the standard method of handling them). Use this option when
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you want to use a non-GNU linker, which also requires using the
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.B collect2
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program to make sure the system linker includes
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constructors and destructors. (\c
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.B collect2
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is included in the GNU CC distribution.) For systems which
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.I must
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use
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.B collect2\c
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\&, the compiler driver
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.B gcc
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is configured to do this automatically.
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.TP
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.B \-fmemoize\-lookups
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.TP
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.B \-fsave\-memoized
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These flags are used to get the compiler to compile programs faster
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using heuristics. They are not on by default since they are only effective
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about half the time. The other half of the time programs compile more
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slowly (and take more memory).
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The first time the compiler must build a call to a member function (or
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reference to a data member), it must (1) determine whether the class
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implements member functions of that name; (2) resolve which member
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function to call (which involves figuring out what sorts of type
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conversions need to be made); and (3) check the visibility of the member
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function to the caller. All of this adds up to slower compilation.
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Normally, the second time a call is made to that member function (or
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reference to that data member), it must go through the same lengthy
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process again. This means that code like this
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.sp
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.br
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\ \ cout\ <<\ "This\ "\ <<\ p\ <<\ "\ has\ "\ <<\ n\ <<\ "\ legs.\en";
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.br
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.sp
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makes six passes through all three steps. By using a software cache,
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a ``hit'' significantly reduces this cost. Unfortunately, using the
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cache introduces another layer of mechanisms which must be implemented,
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and so incurs its own overhead. `\|\c
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.B \-fmemoize\-lookups\c
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\&\|' enables
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the software cache.
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Because access privileges (visibility) to members and member functions
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may differ from one function context to the next,
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.B g++
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may need to flush the cache. With the `\|\c
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.B \-fmemoize\-lookups\c
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\&\|' flag, the cache is flushed after every
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function that is compiled. The `\|\c
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\-fsave\-memoized\c
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\&\|' flag enables the same software cache, but when the compiler
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determines that the context of the last function compiled would yield
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the same access privileges of the next function to compile, it
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preserves the cache.
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This is most helpful when defining many member functions for the same
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class: with the exception of member functions which are friends of
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other classes, each member function has exactly the same access
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privileges as every other, and the cache need not be flushed.
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.TP
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.B \-fno\-default\-inline
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Do not make member functions inline by default merely because they are
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defined inside the class scope. Otherwise, when you specify
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.B \-O\c
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\&, member functions defined inside class scope are compiled
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inline by default; i.e., you don't need to add `\|\c
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.B inline\c
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\&\|' in front of
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the member function name.
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.TP
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.B \-fno\-strict\-prototype
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Consider the declaration \c
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.B int foo ();\c
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\&. In C++, this means that the
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function \c
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.B foo\c
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\& takes no arguments. In ANSI C, this is declared
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.B int foo(void);\c
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\&. With the flag `\|\c
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.B \-fno\-strict\-prototype\c
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\&\|',
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declaring functions with no arguments is equivalent to declaring its
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argument list to be untyped, i.e., \c
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.B int foo ();\c
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\& is equivalent to
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saying \c
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.B int foo (...);\c
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\&.
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.TP
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.B \-fnonnull\-objects
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Normally, GNU C++ makes conservative assumptions about objects reached
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through references. For example, the compiler must check that `\|\c
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.B a\c
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\&\|' is not null in code like the following:
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.br
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\ \ \ \ obj\ &a\ =\ g\ ();
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.br
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\ \ \ \ a.f\ (2);
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.br
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Checking that references of this sort have non-null values requires
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extra code, however, and it is unnecessary for many programs. You can
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use `\|\c
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.B \-fnonnull\-objects\c
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\&\|' to omit the checks for null, if your program doesn't require the
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default checking.
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.TP
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.B \-fthis\-is\-variable
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The incorporation of user-defined free store management into C++ has
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made assignment to \c
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.B this\c
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\& an anachronism. Therefore, by default GNU
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C++ treats the type of \c
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.B this\c
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\& in a member function of \c
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.B class X\c
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\&
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to be \c
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.B X *const\c
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\&. In other words, it is illegal to assign to
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\c
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.B this\c
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\& within a class member function. However, for backwards
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compatibility, you can invoke the old behavior by using
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\&`\|\c
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.B \-fthis\-is\-variable\c
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\&\|'.
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.TP
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.B \-g
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Produce debugging information in the operating system's native format
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(for DBX or SDB or DWARF). GDB also can work with this debugging
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information. On most systems that use DBX format, `\|\c
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.B \-g\c
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\&\|' enables use
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of extra debugging information that only GDB can use.
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Unlike most other C compilers, GNU CC allows you to use `\|\c
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.B \-g\c
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\&\|' with
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`\|\c
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.B \-O\c
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\&\|'. The shortcuts taken by optimized code may occasionally
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produce surprising results: some variables you declared may not exist
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at all; flow of control may briefly move where you did not expect it;
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some statements may not be executed because they compute constant
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results or their values were already at hand; some statements may
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execute in different places because they were moved out of loops.
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Nevertheless it proves possible to debug optimized output. This makes
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it reasonable to use the optimizer for programs that might have bugs.
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.TP
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.BI "\-I" "dir"\c
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\&
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Append directory \c
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.I dir\c
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\& to the list of directories searched for include files.
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.TP
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.BI "\-L" "dir"\c
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\&
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Add directory \c
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.I dir\c
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\& to the list of directories to be searched
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for `\|\c
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.B \-l\c
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\&\|'.
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.TP
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.BI \-l library\c
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\&
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Use the library named \c
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.I library\c
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\& when linking. (C++ programs often require `\|\c
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\-lg++\c
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\&\|' for successful linking.)
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.TP
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|
.B \-nostdinc
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Do not search the standard system directories for header files. Only
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the directories you have specified with
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.B \-I
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options (and the current directory, if appropriate) are searched.
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.TP
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.B \-nostdinc++
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Do not search for header files in the standard directories specific to
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C++, but do still search the other standard directories. (This option
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is used when building libg++.)
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.TP
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.B \-O
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Optimize. Optimizing compilation takes somewhat more time, and a lot
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more memory for a large function.
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.TP
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.BI "\-o " file\c
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\&
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Place output in file \c
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.I file\c
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\&.
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.TP
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.B \-S
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Stop after the stage of compilation proper; do not assemble. The output
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is an assembler code file for each non-assembler input
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file specified.
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.TP
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.B \-traditional
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Attempt to support some aspects of traditional C compilers.
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Specifically, for both C and C++ programs:
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.TP
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|
\ \ \ \(bu
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|
In the preprocessor, comments convert to nothing at all, rather than
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to a space. This allows traditional token concatenation.
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|
.TP
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|
\ \ \ \(bu
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|
In the preprocessor, macro arguments are recognized within string
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|
constants in a macro definition (and their values are stringified,
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though without additional quote marks, when they appear in such a
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context). The preprocessor always considers a string constant to end
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at a newline.
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.TP
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|
\ \ \ \(bu
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|
The preprocessor does not predefine the macro \c
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.B __STDC__\c
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|
\& when you use
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`\|\c
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|
.B \-traditional\c
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|
\&\|', but still predefines\c
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|
.B __GNUC__\c
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|
\& (since the GNU extensions indicated by
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.B __GNUC__\c
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\& are not affected by
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`\|\c
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.B \-traditional\c
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|
\&\|'). If you need to write header files that work
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|
differently depending on whether `\|\c
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.B \-traditional\c
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|
\&\|' is in use, by
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|
testing both of these predefined macros you can distinguish four
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situations: GNU C, traditional GNU C, other ANSI C compilers, and
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|
other old C compilers.
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|
.TP
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|
\ \ \ \(bu
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|
In the preprocessor, comments convert to nothing at all, rather than
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to a space. This allows traditional token concatenation.
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|
.TP
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|
\ \ \ \(bu
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|
In the preprocessor, macro arguments are recognized within string
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|
constants in a macro definition (and their values are stringified,
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|
though without additional quote marks, when they appear in such a
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|
context). The preprocessor always considers a string constant to end
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|
at a newline.
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|
.TP
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|
\ \ \ \(bu
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|
The preprocessor does not predefine the macro \c
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.B __STDC__\c
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|
\& when you use
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`\|\c
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.B \-traditional\c
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\&\|', but still predefines\c
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.B __GNUC__\c
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|
\& (since the GNU extensions indicated by
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.B __GNUC__\c
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\& are not affected by
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`\|\c
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|
.B \-traditional\c
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|
\&\|'). If you need to write header files that work
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differently depending on whether `\|\c
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.B \-traditional\c
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|
\&\|' is in use, by
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testing both of these predefined macros you can distinguish four
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situations: GNU C, traditional GNU C, other ANSI C compilers, and
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other old C compilers.
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|
.PP
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.TP
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\ \ \ \(bu
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String ``constants'' are not necessarily constant; they are stored in
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writable space, and identical looking constants are allocated
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separately.
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For C++ programs only (not C), `\|\c
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.B \-traditional\c
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\&\|' has one additional effect: assignment to
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.B this
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is permitted. This is the same as the effect of `\|\c
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|
.B \-fthis\-is\-variable\c
|
||
|
\&\|'.
|
||
|
.TP
|
||
|
.BI \-U macro
|
||
|
Undefine macro \c
|
||
|
.I macro\c
|
||
|
\&.
|
||
|
.TP
|
||
|
.B \-Wall
|
||
|
Issue warnings for conditions which pertain to usage that we recommend
|
||
|
avoiding and that we believe is easy to avoid, even in conjunction
|
||
|
with macros.
|
||
|
.TP
|
||
|
.B \-Wenum\-clash
|
||
|
Warn when converting between different enumeration types.
|
||
|
.TP
|
||
|
.B \-Woverloaded\-virtual
|
||
|
In a derived class, the definitions of virtual functions must match
|
||
|
the type signature of a virtual function declared in the base class.
|
||
|
Use this option to request warnings when a derived class declares a
|
||
|
function that may be an erroneous attempt to define a virtual
|
||
|
function: that is, warn when a function with the same name as a
|
||
|
virtual function in the base class, but with a type signature that
|
||
|
doesn't match any virtual functions from the base class.
|
||
|
.TP
|
||
|
.B \-Wtemplate\-debugging
|
||
|
When using templates in a C++ program, warn if debugging is not yet
|
||
|
fully available.
|
||
|
.TP
|
||
|
.B \-w
|
||
|
Inhibit all warning messages.
|
||
|
.TP
|
||
|
.BI +e N
|
||
|
Control how virtual function definitions are used, in a fashion
|
||
|
compatible with
|
||
|
.B cfront
|
||
|
1.x.
|
||
|
.PP
|
||
|
|
||
|
.SH PRAGMAS
|
||
|
Two `\|\c
|
||
|
.B #pragma\c
|
||
|
\&\|' directives are supported for GNU C++, to permit using the same
|
||
|
header file for two purposes: as a definition of interfaces to a given
|
||
|
object class, and as the full definition of the contents of that object class.
|
||
|
.TP
|
||
|
.B #pragma interface
|
||
|
Use this directive in header files that define object classes, to save
|
||
|
space in most of the object files that use those classes. Normally,
|
||
|
local copies of certain information (backup copies of inline member
|
||
|
functions, debugging information, and the internal tables that
|
||
|
implement virtual functions) must be kept in each object file that
|
||
|
includes class definitions. You can use this pragma to avoid such
|
||
|
duplication. When a header file containing `\|\c
|
||
|
.B #pragma interface\c
|
||
|
\&\|' is included in a compilation, this auxiliary information
|
||
|
will not be generated (unless the main input source file itself uses
|
||
|
`\|\c
|
||
|
.B #pragma implementation\c
|
||
|
\&\|'). Instead, the object files will contain references to be
|
||
|
resolved at link time.
|
||
|
.tr !"
|
||
|
.TP
|
||
|
.B #pragma implementation
|
||
|
.TP
|
||
|
.BI "#pragma implementation !" objects .h!
|
||
|
Use this pragma in a main input file, when you want full output from
|
||
|
included header files to be generated (and made globally visible).
|
||
|
The included header file, in turn, should use `\|\c
|
||
|
.B #pragma interface\c
|
||
|
\&\|'.
|
||
|
Backup copies of inline member functions, debugging information, and
|
||
|
the internal tables used to implement virtual functions are all
|
||
|
generated in implementation files.
|
||
|
|
||
|
If you use `\|\c
|
||
|
.B #pragma implementation\c
|
||
|
\&\|' with no argument, it applies to an include file with the same
|
||
|
basename as your source file; for example, in `\|\c
|
||
|
.B allclass.cc\c
|
||
|
\&\|', `\|\c
|
||
|
.B #pragma implementation\c
|
||
|
\&\|' by itself is equivalent to `\|\c
|
||
|
.B
|
||
|
#pragma implementation "allclass.h"\c
|
||
|
\&\|'. Use the string argument if you want a single implementation
|
||
|
file to include code from multiple header files.
|
||
|
|
||
|
There is no way to split up the contents of a single header file into
|
||
|
multiple implementation files.
|
||
|
.SH FILES
|
||
|
.ta \w'LIBDIR/g++\-include 'u
|
||
|
file.h C header (preprocessor) file
|
||
|
.br
|
||
|
file.i preprocessed C source file
|
||
|
.br
|
||
|
file.C C++ source file
|
||
|
.br
|
||
|
file.cc C++ source file
|
||
|
.br
|
||
|
file.cxx C++ source file
|
||
|
.br
|
||
|
file.s assembly language file
|
||
|
.br
|
||
|
file.o object file
|
||
|
.br
|
||
|
a.out link edited output
|
||
|
.br
|
||
|
\fITMPDIR\fR/cc\(** temporary files
|
||
|
.br
|
||
|
\fILIBDIR\fR/cpp preprocessor
|
||
|
.br
|
||
|
\fILIBDIR\fR/cc1plus compiler
|
||
|
.br
|
||
|
\fILIBDIR\fR/collect linker front end needed on some machines
|
||
|
.br
|
||
|
\fILIBDIR\fR/libgcc.a GCC subroutine library
|
||
|
.br
|
||
|
/lib/crt[01n].o start-up routine
|
||
|
.br
|
||
|
\fILIBDIR\fR/ccrt0 additional start-up routine for C++
|
||
|
.br
|
||
|
/lib/libc.a standard C library, see
|
||
|
.IR intro (3)
|
||
|
.br
|
||
|
/usr/include standard directory for
|
||
|
.B #include
|
||
|
files
|
||
|
.br
|
||
|
\fILIBDIR\fR/include standard gcc directory for
|
||
|
.B #include
|
||
|
files
|
||
|
.br
|
||
|
\fILIBDIR\fR/g++\-include additional g++ directory for
|
||
|
.B #include
|
||
|
.sp
|
||
|
.I LIBDIR
|
||
|
is usually
|
||
|
.B /usr/local/lib/\c
|
||
|
.IR machine / version .
|
||
|
.br
|
||
|
.I TMPDIR
|
||
|
comes from the environment variable
|
||
|
.B TMPDIR
|
||
|
(default
|
||
|
.B /usr/tmp
|
||
|
if available, else
|
||
|
.B /tmp\c
|
||
|
\&).
|
||
|
.SH "SEE ALSO"
|
||
|
gcc(1), cpp(1), as(1), ld(1), gdb(1), adb(1), dbx(1), sdb(1).
|
||
|
.br
|
||
|
.RB "`\|" gcc "\|', `\|" cpp \|',
|
||
|
.RB `\| as \|', `\| ld \|',
|
||
|
and
|
||
|
.RB `\| gdb \|'
|
||
|
entries in
|
||
|
.B info\c
|
||
|
\&.
|
||
|
.br
|
||
|
.I
|
||
|
Using and Porting GNU CC (for version 2.0)\c
|
||
|
, Richard M. Stallman;
|
||
|
.I
|
||
|
The C Preprocessor\c
|
||
|
, Richard M. Stallman;
|
||
|
.I
|
||
|
Debugging with GDB: the GNU Source-Level Debugger\c
|
||
|
, Richard M. Stallman and Roland H. Pesch;
|
||
|
.I
|
||
|
Using as: the GNU Assembler\c
|
||
|
, Dean Elsner, Jay Fenlason & friends;
|
||
|
.I
|
||
|
gld: the GNU linker\c
|
||
|
, Steve Chamberlain and Roland Pesch.
|
||
|
|
||
|
.SH BUGS
|
||
|
For instructions on how to report bugs, see the GCC manual.
|
||
|
|
||
|
.SH COPYING
|
||
|
Copyright (c) 1991, 1992, 1993 Free Software Foundation, Inc.
|
||
|
.PP
|
||
|
Permission is granted to make and distribute verbatim copies of
|
||
|
this manual provided the copyright notice and this permission notice
|
||
|
are preserved on all copies.
|
||
|
.PP
|
||
|
Permission is granted to copy and distribute modified versions of this
|
||
|
manual under the conditions for verbatim copying, provided that the
|
||
|
entire resulting derived work is distributed under the terms of a
|
||
|
permission notice identical to this one.
|
||
|
.PP
|
||
|
Permission is granted to copy and distribute translations of this
|
||
|
manual into another language, under the above conditions for modified
|
||
|
versions, except that this permission notice may be included in
|
||
|
translations approved by the Free Software Foundation instead of in
|
||
|
the original English.
|
||
|
.SH AUTHORS
|
||
|
See the GNU CC Manual for the contributors to GNU CC.
|