llvmc(1) The LLVM Compiler Driver (WIP)


llvmc [options] filenames...


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 gcc tool, it is very similar. Please note that llvmc is considered an experimental tool.


Built-in Options

LLVMC has some built-in options that can't be overridden in the configuration libraries.
-o filename
Output file name.
-x language
Specify the language of the following input files until the next -x option.
-load plugin_name
Load the specified plugin DLL. Example: -load $LLVM_DIR/Release/lib/LLVMCSimple.so.
-v or --verbose
Enable verbose mode, i.e. print out all executed commands.
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.
Show a graphical representation of the compilation graph and exit. Requires that you have dot and gv programs installed. Hidden option, useful for debugging LLVMC plugins.
Write a compilation-graph.dot file in the current directory with the compilation graph description in Graphviz format (identical to the file used by the --view-graph option). The -o option can be used to set the output file name. Hidden option, useful for debugging LLVMC plugins.
Write temporary files to the current directory and do not delete them on exit. This option can also take an argument: the --save-temps=obj switch will write files into the directory specified with the -o option. The --save-temps=cwd and --save-temps switches are both synonyms for the default behaviour.
--temp-dir directory
Store temporary files in the given directory. This directory is deleted on exit unless --save-temps is specified. If --save-temps=obj is also specified, --temp-dir is given the precedence.
Print a summary of command-line options and exit.
Print a summary of command-line options and exit. Print help even for options intended for developers.
Print version information and exit.
Read command-line options from file. The options read are inserted in place of the original @file option. If file does not exist, or cannot be read, then the option will be treated literally, and not removed.

Options in 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 @file options; any such options will be processed recursively.

Control Options

By default, LLVMC is built with some standard configuration libraries that define the following options:
Use Clang instead of llvm-gcc.
Enable optimization passes with opt. To pass options to the opt program use the -Wo, option.
-I directory
Add a directory to the header file search path. This option can be repeated.
-L directory
Add directory to the library search path. This option can be repeated.
Link in the library libname.[bc | a | so]. This library should be a bitcode library.
Make the output be LLVM bitcode (with -c) or assembly (with -S) instead of native object (or assembly). If -emit-llvm is given without either -c or -S it has no effect.
Pass options to assembler.
Pass options to linker.
Pass options to opt.


If 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 llvmc will return the same result code as the failing compilation tool.


Maintained by the LLVM Team (<http://llvm.org>).