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