\chapter{The \Coq~commands}\label{Addoc-coqc}
\ttindex{coqtop}
\ttindex{coqc}

There are two \Coq~commands: 
\begin{itemize}
\item {\tt coqtop}: The \Coq\ toplevel (interactive mode) ; 
\item {\tt coqc} : The \Coq\ compiler (batch compilation).
\end{itemize}
The options are (basically) the same for the two commands, and
roughly described below. You can also look at the \verb!man! pages of
\verb!coqtop! and \verb!coqc! for more details.


\section{Interactive use ({\tt coqtop})}

In the interactive mode, also known as the \Coq~toplevel, the user can
develop his theories and proofs step by step.  The \Coq~toplevel is
run by the command {\tt coqtop}. 

\index{byte-code}
\index{native code}
\label{binary-images}
They are two different binary images of \Coq: the byte-code one and
the native-code one (if Objective Caml provides a native-code compiler
for your platform, which is supposed in the following).  When invoking
\verb!coqtop! or \verb!coqc!, the native-code version of the system is
used.  The command-line options \verb!-byte! and \verb!-opt! explicitly
select the byte-code and the native-code versions, respectively.

The byte-code toplevel is based on a Caml
toplevel (to allow the dynamic link of tactics).  You can switch to
the Caml toplevel with the command \verb!Drop.!, and come back to the
\Coq~toplevel with the command \verb!Toplevel.loop();;!.

% The command \verb!coqtop -searchisos! runs the search tool {\sf
%   Coq\_SearchIsos} (see section~\ref{coqsearchisos},
% page~\pageref{coqsearchisos}) and, as the \Coq~system, can be combined
% with the option \verb!-opt!.

\section{Batch compilation ({\tt coqc})}
The {\tt coqc} command takes a name {\em file} as argument.  Then it
looks for a vernacular file named {\em file}{\tt .v}, and tries to
compile it into a {\em file}{\tt .vo} file (See ~\ref{compiled}).

\Warning The name {\em file} must be a regular {\Coq} identifier, as
defined in the section \ref{lexical}. It
must only contain letters, digits or underscores
(\_). Thus it can be \verb+/bar/foo/toto.v+ but cannot be
\verb+/bar/foo/to-to.v+ . 

Notice that the \verb!-byte! and \verb!-opt! options are still
available with \verb!coqc!  and allow you to select the byte-code or
native-code versions of the system.


\section{Resource file}
\index{Resource file}

When \Coq\ is launched, with either {\tt coqtop} or {\tt coqc}, the
resource file \verb:$HOME/.coqrc.7.0: is loaded, where \verb:$HOME: is
the home directory of the user.  If this file is not found, then the
file \verb:$HOME/.coqrc: is searched. You can also specify an
arbitrary name for the resource file (see option \verb:-init-file:
below), or the name of another user to load the resource file of
someone else (see option \verb:-user:).

This file may contain, for instance, \verb:Add LoadPath: commands to add
directories to the load path of \Coq.
It is possible to skip the loading of the resource file with the
option \verb:-q:.

\section{Environment variables}
\label{EnvVariables}
\index{Environment variables}

There are three environment variables used by the \Coq\ system.
\verb:$COQBIN: for the directory where the binaries are,
\verb:$COQLIB: for the directory whrer the standard library is, and 
\verb:$COQTOP: for the directory of the sources. The latter is useful
only for developers that are writing their own tactics and are using
\texttt{coq\_makefile} (see \ref{Makefile}). If \verb:$COQBIN: or
\verb:$COQLIB: are not defined, \Coq\ will use the default values
(defined at installation time). So these variables are useful only if
you move the \Coq\ binaries and library after installation.

\section{Options}
\index{Options of the command line}

The following command-line options are recognized by the commands {\tt
  coqc} and {\tt coqtop}:

\begin{description}
\item[{\tt -byte}]\ 

  Run the byte-code version of \Coq{}.

\item[{\tt -opt}]\ 

  Run the native-code version of \Coq{}.

\item[{\tt -I} {\em directory}, {\tt -include} {\em directory}]\ 

  Add {\em directory} to the searched directories when looking for a
  file.

\item[{\tt -R} {\em directory} {\dirpath}]\ 

  This maps the subdirectory structure of physical {\em directory} to
  logical {\dirpath} and adds {\em directory} and its subdirectories
  to the searched directories when looking for a file.

\item[{\tt -is} {\em file}, {\tt -inputstate} {\em file}]\ 

  Cause \Coq~to use the state put in the file {\em file} as its input
  state. The default state is {\em initial.coq}.
  Mainly useful to build the standard input state.

\item[{\tt -nois}]\ 

  Cause \Coq~to begin with an empty state. Mainly useful to build the
  standard input state.

\item[{\tt -notactics}]\ 

  Forbid the dynamic loading of tactics.

\item[{\tt -init-file} {\em file}]\ 

  Take {\em file} as the resource file.

\item[{\tt -q}]\ 

  Cause \Coq~not to load the resource file.

\item[{\tt -user} {\em username}]\ 

  Take resource file of user {\em username} (that is 
  \verb+~+{\em username}{\tt /.coqrc.7.0}) instead of yours.

\item[{\tt -load-ml-source} {\em file}]\ 

  Load the Caml source file {\em file}.

\item[{\tt -load-ml-object} {\em file}]\ 

  Load the Caml object file {\em file}.

\item[{\tt -load-vernac-source} {\em file}]\ 

  Load \Coq~file {\em file}{\tt .v}

\item[{\tt -load-vernac-object} {\em file}]\ 

  Load \Coq~compiled file {\em file}{\tt .vo}

%\item[{\tt -preload} {\em file}]\ \\
%Add {\em file}{\tt .vo} to the files to be loaded and opened
%before making the initial state.
%
\item[{\tt -require} {\em file}]\ 

  Load \Coq~compiled file {\em file}{\tt .vo} and import it ({\tt
    Require} {\em file}).

\item[{\tt -compile} {\em file}]\ 

  This compiles file {\em file}{\tt .v} into {\em file}{\tt .vo}.
  This option implies options {\tt -batch} and {\tt -silent}. It is
  only available for {\tt coqtop}.

%\item[{\tt -compile-verbose} {\em file}]\ 

%  This compiles file {\em file}{\tt .v} into {\em file}{\tt .vo} with
%  a copy of the contents of the file on standard input.
%  This option implies options {\tt -batch} and {\tt -silent}. It is
%  only available for {\tt coqtop}.

\item[{\tt -batch}]\ 

  Batch mode : exit just after arguments parsing. This option is only
  used by {\tt coqc}.

\item[{\tt -debug}]\ 

  Switch on the debug flag.

\item[{\tt -xml}]\ 

  This option is for use with {\tt coqc}. It tells \Coq\ to export on
  the standard output the content of the compiled file into XML format.

\item[{\tt -emacs}]\ 

  Tells \Coq\ it is executed under Emacs.

\item[{\tt -db}]\ 

  Launch \Coq\ under the Objective Caml debugger (provided that \Coq\
  has been compiled for debugging; see next chapter).

\item[{\tt -impredicative-set}]\ 

  Change the logical theory of {\Coq} by declaring the sort {\tt Set}
  impredicative; warning: this is known to be inconsistent with
  some standard axioms of classical mathematics such as the functional
  axiom of choice or the principle of description

\item[{\tt -dont-load-proofs}]\ 

  This avoids loading in memory the proofs of opaque theorems
  resulting in a smaller memory requirement and faster compilation;
  warning: this invalidates some features such as the extraction tool.

\item[{\tt -image} {\em file}]\ 

  This option sets the binary image to be used to be {\em file}
  instead of the standard one. Not of general use.

\item[{\tt -bindir} {\em directory}]\ 

  Set the directory containing \Coq\ binaries.
  It is equivalent to do \texttt{export COQBIN=}{\em directory}
  before lauching \Coq.

\item[{\tt -libdir} {\em file}]\ 

  Set the directory containing \Coq\ libraries.
  It is equivalent to do \texttt{export COQLIB=}{\em directory}
  before lauching \Coq.

\item[{\tt -where}]\ 

  Print the \Coq's standard library location and exit.

\item[{\tt -v}]\ 

  Print the \Coq's version and exit.

\item[{\tt -h}, {\tt --help}]\ 

  Print a short usage and exit.

\end{description}

% {\tt coqtop} owns an additional option:

% \begin{description}
% \item[{\tt -searchisos}]\ \\
%   Launch the {\sf Coq\_SearchIsos} toplevel
%   (see section~\ref{coqsearchisos}, page~\pageref{coqsearchisos}).
% \end{description}

% $Id$ 

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