Vendor import of llvm release_30 branch r142614:

http://llvm.org/svn/llvm-project/llvm/branches/release_30@142614

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-=pod
-
-=head1 NAME
-
-llvmc - The LLVM Compiler Driver (WIP)
-
-=head1 SYNOPSIS
-
-B<llvmc> [I<options>] I<filenames...>
-
-=head1 DESCRIPTION
-
-B<llvmc> is a configurable driver for invoking other LLVM (and non-LLVM) tools
-in order to compile, optimize and link software for multiple languages. For
-those familiar with FSF's B<gcc> tool, it is very similar.  Please note that
-B<llvmc> is considered an experimental tool.
-
-=head1 OPTIONS
-
-=head2 Built-in Options
-
-LLVMC has some built-in options that can't be overridden in the
-configuration libraries.
-
-=over
-
-=item B<-o> I<filename>
-
-Output file name.
-
-=item B<-x> I<language>
-
-Specify the language of the following input files until the next B<-x>
-option.
-
-=item B<-load> I<plugin_name>
-
-Load the specified plugin DLL. Example:
-S<-load $LLVM_DIR/Release/lib/LLVMCSimple.so>.
-
-=item B<-v> or B<--verbose>
-
-Enable verbose mode, i.e. print out all executed commands.
-
-=item B<--check-graph>
-
-Check the compilation for common errors like mismatched output/input language
-names, multiple default edges and cycles. Because of plugins, these checks can't
-be performed at compile-time. Exit with code zero if no errors were found, and
-return the number of found errors otherwise. Hidden option, useful for debugging
-LLVMC plugins.
-
-=item B<--view-graph>
-
-Show a graphical representation of the compilation graph and exit. Requires that
-you have I<dot> and I<gv> programs installed. Hidden option, useful for
-debugging LLVMC plugins.
-
-=item B<--write-graph>
-
-Write a I<compilation-graph.dot> file in the current directory with the
-compilation graph description in Graphviz format (identical to the file used by
-the B<--view-graph> option). The B<-o> option can be used to set the output file
-name. Hidden option, useful for debugging LLVMC plugins.
-
-=item B<--save-temps>
-
-Write temporary files to the current directory and do not delete them on
-exit. This option can also take an argument: the I<--save-temps=obj> switch will
-write files into the directory specified with the I<-o> option. The
-I<--save-temps=cwd> and I<--save-temps> switches are both synonyms for the
-default behaviour.
-
-=item B<--temp-dir> I<directory>
-
-Store temporary files in the given directory. This directory is deleted on exit
-unless I<--save-temps> is specified. If I<--save-temps=obj> is also specified,
-I<--temp-dir> is given the precedence.
-
-=item B<-help>
-
-Print a summary of command-line options and exit.
-
-=item B<-help-hidden>
-
-Print a summary of command-line options and exit. Print help even for
-options intended for developers.
-
-=item B<--version>
-
-Print version information and exit.
-
-=item B<@>I<file>
-
-Read command-line options from I<file>. The options read are inserted
-in place of the original @I<file> option. If I<file> does not exist, or
-cannot be read, then the option will be treated literally, and not
-removed.
-
-Options in I<file> are separated by whitespace. A whitespace character
-may be included in an option by surrounding the entire option in
-either single or double quotes. Any character (including a backslash)
-may be included by prefixing the character to be included with a
-backslash. The file may itself contain additional @I<file> options;
-any such options will be processed recursively.
-
-
-=back
-
-
-=head2 Control Options
-
-By default, LLVMC is built with some standard configuration libraries
-that define the following options:
-
-=over
-
-=item B<-clang>
-
-Use Clang instead of llvm-gcc.
-
-=item B<-opt>
-
-Enable optimization passes with B<opt>. To pass options to the B<opt> program
-use the B<-Wo,> option.
-
-=item B<-I> I<directory>
-
-Add a directory to the header file search path.
-
-=item B<-L> I<directory>
-
-Add I<directory> to the library search path.
-
-=item B<-F> I<directory>
-
-Add I<directory> to the framework search path.
-
-=item B<-l>I<name>
-
-Link in the library libI<name>.[bc | a | so].  This library should
-be a bitcode library.
-
-=item B<-framework> I<name>
-
-Link in the library libI<name>.[bc | a | so].  This library should
-be a bitcode library.
-
-=item B<-emit-llvm>
-
-Output LLVM bitcode (with B<-c>) or assembly (with B<-S>) instead of native
-object (or assembly).  If B<-emit-llvm> is given without either B<-c> or B<-S>
-it has no effect.
-
-=item B<-Wa>
-
-Pass options to assembler.
-
-=item B<-Wl>
-
-Pass options to linker.
-
-=item B<-Wo>
-
-Pass options to opt.
-
-=item B<-Wllc>
-
-Pass options to llc (code generator).
-
-=back
-
-=head1 EXIT STATUS
-
-If B<llvmc> succeeds, it will exit with code 0.  Otherwise, if an
-error occurs, it will exit with a non-zero value. If one of the
-compilation tools returns a non-zero status, pending actions will be
-discarded and B<llvmc> will return the same result code as the failing
-compilation tool.
-
-=head1 SEE ALSO
-
-L<llvm-gcc|llvmgcc>, L<llvm-g++|llvmgxx>, L<llvm-as|llvm-as>,
-L<llvm-dis|llvm-dis>, L<llc|llc>, L<llvm-link|llvm-link>
-
-=head1 AUTHORS
-
-Maintained by the LLVM Team (L<http://llvm.org/>).
-
-=cut