NAME¶

llvmc - The LLVM Compiler Driver (WIP)

SYNOPSIS¶

llvmc [options] filenames...

DESCRIPTION¶

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.

OPTIONS¶

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-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.

--view-graph

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-graph

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.

--save-temps

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.

-help

Print a summary of command-line options and exit.

-help-hidden

Print a summary of command-line options and exit. Print help even for options intended for developers.

--version

Print version information and exit.

@file

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:

-clang

Use Clang instead of llvm-gcc.

-opt

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.

-L directory

Add directory to the library search path.

-F directory

Add directory to the framework search path.

-lname

Link in the library libname.[bc | a | so]. This library should be a bitcode library.

-framework name

Link in the library libname.[bc | a | so]. This library should be a bitcode library.

-emit-llvm

Output 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.

-Wa

Pass options to assembler.

-Wl

Pass options to linker.

-Wo

Pass options to opt.

-Wllc

Pass options to llc (code generator).

EXIT STATUS¶

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.

SEE ALSO¶

llvm-gcc, llvm-g++, llvm-as, llvm-dis, llc, llvm-link

AUTHORS¶

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