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=pod
=head1 NAME
extract - extract a function from an LLVM module
=head1 SYNOPSIS
B<extract> [I<options>] B<--func> I<function-name> [I<filename>]
=head1 DESCRIPTION
The B<extract> command takes the name of a function and extracts it from
the specified LLVM bytecode file. It is primarily used as a debugging tool to
reduce test cases from larger programs that are triggering a bug.
In addition to extracting the bytecode of the specified function,
B<extract> will also remove unreachable global variables, prototypes, and
unused types.
The B<extract> command reads its input from standard input if filename is
omitted or if filename is -. The output is always written to standard output,
unless the B<-o> option is specified (see below).
=head1 OPTIONS
=over
=item B<-f>
Force overwrite. Normally, B<extract> will refuse to overwrite an
output file that already exists. With this option, B<extract>
will overwrite the output file and replace it with new bytecode.
=item B<--func> I<function-name>
Extract the function named I<function-name> from the LLVM bytecode.
=item B<--help>
Print a summary of command line options.
=item B<-o> I<filename>
Specify the output filename. If filename is "-" (the default), then
B<extract> sends its output to standard output.
=item B<--stats>
Print statistics.
=item B<--time-passes>
Record the amount of time needed for each pass and print it to standard
error.
=back
=head1 EXIT STATUS
If B<extract> succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
=head1 SEE ALSO
L<bugpoint|bugpoint>
=head1 AUTHORS
Maintained by the LLVM Team (L<http://llvm.cs.uiuc.edu>).
=cut
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