llvm-6502/docs/CommandGuide/llvmgcc.html

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LLVM: llvmgcc tool
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<h1>LLVM: <tt>llvmgcc</tt> tool</h1>
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<h3>NAME</h3>
<tt>llvmgcc</tt>
<h3>
SYNOPSIS
</h3>
<tt>llvmgcc [options] filename</tt>
<h3>
DESCRIPTION
</h3>
The <tt>llvmgcc</tt> command is the LLVM C front end. It is a modified version
of the <a href="http://gcc.gnu.org">GNU Compiler Collection</a> (GCC) that takes
C programs and compiles them into LLVM bytecode or assembly language, depending
upon the options.
<p>
Unless the <tt>-S</tt> option is specified, <tt>llvmgcc</tt> will use the
<a href="gccas.html"><tt>gccas</tt></a> program to perform some optimizations
and create an LLVM bytecode file. Unless the <tt>-c</tt> option is specified,
<tt>llvmgcc</tt> will also use the <a href="gccld.html"><tt>gccld</tt></a>
program to perform further optimizations and link the resulting bytecode
file(s) with support libraries to create an executable program.
<p>
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.
<p>
Below you will find several commonly used options:
<h3>
OPTIONS
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<ul>
<li> -S
<br>
Do not generate an LLVM bytecode file. Rather, compile the source file
into an LLVM assembly language file.
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<li> -c
<br>
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.
<p>
<li> -o <i>filename</i>
<br>
Specify the output file to be <i>filename</i>.
<p>
<li> -I <i>directory</i>
<br>
Add a directory to the header file search path. This option can be
repeated.
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<li> -L <i>directory</i>
<br>
Add <i>directory</i> to the library search path. This option can be
repeated.
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<li> -l<i>name</i>
<br>
Link in the library lib<i>name</i>.[bc | a | so]. This library should
be a bytecode library.
<p>
<li>-Wl,<i>option</i>
<br>
Pass <i>option</i> to the linker program, <a
href="gccld.html"><tt>gccld</tt></a>.
<p>
</ul>
<h3>
EXIT STATUS
</h3>
If <tt>llvmgcc</tt> succeeds, it will exit with 0. Otherwise, if an error
occurs, it will exit with a non-zero value.
<h3>
SEE ALSO
</h3>
<A HREF="llvmgxx.html"><tt>llvmg++</tt></A>,
<A HREF="gccas.html"><tt>gccas</tt></A>,
<A HREF="gccld.html"><tt>gccld</tt></A>,
and the Info documentation for <tt>gcc</tt>.
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Maintained by the <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>.
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