LLVM: `llvmgcc` tool

NAME

llvmgcc

SYNOPSIS

llvmgcc [options] filename

DESCRIPTION

The llvmgcc command is the LLVM C front end. It is a modified version of the GNU Compiler Collection (GCC) that takes C programs and compiles them into LLVM bytecode or assembly language, depending upon the options.

Unless the -S option is specified, llvmgcc will use the gccas program to perform some optimizations and create an LLVM bytecode file. Unless the -c option is specified, llvmgcc will also use the gccld program to perform further optimizations and link the resulting bytecode file(s) with support libraries to create an executable program.

Being derived from GCC, llvmgcc has many of GCC's features and accepts most of GCC's options. It handles a number of GCC's extensions to the C programming language.

Below you will find several commonly used options:

OPTIONS

-S
Do not generate an LLVM bytecode file. Rather, compile the source file into an LLVM assembly language file.
-c
Do not generate a linked bytecode executable. Rather, compile the source file into an LLVM bytecode file. This bytecode file can then be linked with other bytecode files later to generate a full LLVM executable.
-o filename
Specify the output file to be filename.
-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.
-lname
Link in the library libname.[bc | a | so]. This library should be a bytecode library.
-Wl,option
Pass option to the linker program, gccld.

EXIT STATUS

If llvmgcc succeeds, it will exit with 0. Otherwise, if an error occurs, it will exit with a non-zero value.