mirror of
https://github.com/RPCS3/llvm-mirror.git
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Performed a major update for the pre-release.
Attempted to better structure and order the document. Added more information about autoconf, the build system, and how to build LLVM. Added directions on how to build the C front end. Added a section on common problems and their solutions. llvm-svn: 7096
This commit is contained in:
John Criswell
parent
a4df9efb1a
commit
856aa7e828
@ -18,26 +18,27 @@
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<ul>
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<li><a href="#overview">Overview</a>
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<li><a href="#starting">Getting started with LLVM</a>
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<ol>
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<ol>
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<li><a href="#requirements">Requirements</a>
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<ol>
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<li><a href="#hardware">Hardware</a>
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<li><a href="#software">Software</a>
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</ol>
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</ol>
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<li><a href="#starting">Getting started with LLVM</a>
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<ol>
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<li><a href="#quickstart">Getting started quickly (a summary)</a>
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<li><a href="#checkout">Checkout LLVM from CVS</a>
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<li><a href="#terminology">Terminology and Notation</tt></a>
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<li><a href="#objfiles">The location for object files</tt></a>
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<li><a href="#config">Local Configuration Options</tt></a>
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<li><a href="#environment">Setting up your environment</a>
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<li><a href="#compile">Compiling the source code</a>
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<li><a href="#checkout">Checkout LLVM from CVS</a>
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<li><a href="#config">Local LLVM Configuration</tt></a>
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<li><a href="#compile">Compiling the LLVM Suite Source Code</a>
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<li><a href="#build">Building the LLVM C Front End</a>
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<li><a href="#objfiles">The location for object files</tt></a>
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</ol>
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<li><a href="#layout">Program layout</a>
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<ol>
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<li><a href="#cvsdir">CVS directories</a>
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<li><a href="#dd"><tt>Depend</tt>, <tt>Debug</tt>, &
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<tt>Release</tt> directories</a></li>
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<li><a href="#include"><tt>llvm/include</tt></a>
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<li><a href="#lib"><tt>llvm/lib</tt></a>
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<li><a href="#test"><tt>llvm/test</tt></a>
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@ -54,7 +55,111 @@
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</center>
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<!--=====================================================================-->
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<p>The <a href"starting">next section</a> of this guide is meant to get
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Welcome to LLVM! In order to get started, you first need to know some
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basic information.
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<p>
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First, LLVM comes in two pieces. The first piece is the LLVM suite. This
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contains all of the tools, libraries, and header files needed to use the
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low level virtual machine. It also contains a test suite that can be used
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to test the LLVM tools and the GCC front end.
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<p>
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The second piece is the GCC front end. This component provides a version
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of GCC that compiles C code into LLVM bytecode. Currently, the C front end
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is a modified version of GCC 3.4 (we track the GCC 3.4 development).
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Once compiled into LLVM bytecode, a program can be manipulated with the
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LLVM tools.
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<!--=====================================================================-->
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<h3><a name="requirements"><b>Requirements</b></a></h3>
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<!--=====================================================================-->
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Before you begin to use the LLVM system, review the requirements given
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below. This may save you some trouble by knowing ahead of time what
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hardware and software you will need.
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<!--=====================================================================-->
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<h4><a name="hardware"><b>Hardware</b></a></h4>
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<!--=====================================================================-->
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LLVM is known to work on the following platforms:
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<ul>
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<li> Linux on x86
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<ul>
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<li> Approximately 700 MB of Free Disk Space
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<ul>
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<li>Source code: 30 MB
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<li>Object code: 670 MB
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</ul>
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</ul>
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<li> Solaris on SparcV9 (Ultrasparc)
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<ul>
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<li> Approximately 1.03 GB of Free Disk Space
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<ul>
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<li>Source code: 30 MB
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<li>Object code: 1000 MB
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</ul>
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</ul>
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</ul>
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LLVM <i>may</i> compile on other platforms. The LLVM utilities should work
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on other platforms, so it should be possible to generate and produce LLVM
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bytecode on unsupported platforms (although bytecode generated on one
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platform may not work on another platform). However, the code generators
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and Just In Time Compilers (JIT's) only generate SparcV9 or x86 machine
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code.
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<!--=====================================================================-->
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<h4><a name="software"><b>Software</b></a></h4>
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<!--=====================================================================-->
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<p>
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Compiling LLVM requires that you have several different software packages
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installed:
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<dl compact>
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<dt> GCC
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<dd>
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The GNU Compiler Collection must be installed with C and C++ language
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support. GCC 3.2.x works, and GCC 3.x is generally supported.
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<p>
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Note that we currently do not support any other C++ compiler.
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</p>
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<dt> GNU Make
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<dd>
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The LLVM build system relies upon GNU Make extensions. Therefore, you
|
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will need GNU Make (sometimes known as gmake) to build LLVM.
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<p>
|
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|
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<dt> Flex and Bison
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<dd>
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The LLVM source code is built using flex and bison. You will not be
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able to configure and compile LLVM without them.
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<p>
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<dt> GNU M4
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<dd>
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If you are installing Bison on your machine for the first time, you
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will need GNU M4 (version 1.4 or higher).
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</dl>
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<p>
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There are some additional tools that you may want to have when working with
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LLVM:
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</p>
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<ul>
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<li>GNU Autoconf
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<li>GNU M4
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<p>
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If you want to make changes to the configure scripts, you will need
|
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GNU autoconf (2.53 or higher), and consequently, GNU M4 (version 1.4
|
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or higher).
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</p>
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</ul>
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<p>The <a href="starting">next section</a> of this guide is meant to get
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you up and running with LLVM and to give you some basic information about
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the LLVM environment. The <a href"#quickstart">first subsection</a> gives
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a short summary for those who are already familiar with the system and
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@ -72,107 +177,42 @@
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</center>
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<!--=====================================================================-->
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<!--=====================================================================-->
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<h3><a name="requirements"><b>Requirements</b></a></h3>
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<!--=====================================================================-->
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<!--=====================================================================-->
|
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<h4><a name="hardware"><b>Hardware</b></a></h4>
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<!--=====================================================================-->
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LLVM is known to work on the following platforms:
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<ul>
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<li> Linux on x86
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<ul>
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<li> Approximately 700 MB of Free Disk Space
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<ul>
|
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<li>Source code: 30 MB
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<li>Object code: 670 MB
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</ul>
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</ul>
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<li> Solaris on Sparc
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<ul>
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<li> Approximately 1.03 GB of Free Disk Space
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<ul>
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<li>Source code: 30 MB
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<li>Object code: 1000 MB
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</ul>
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</ul>
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</ul>
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LLVM may compile on other platforms. While the LLVM utilities should work,
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they will only generate Sparc or x86 machine code.
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<!--=====================================================================-->
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<h4><a name="software"><b>Software</b></a></h4>
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<!--=====================================================================-->
|
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<p>
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Compiling LLVM requires that you have several different software packages
|
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installed:
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||||
|
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<ul>
|
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<li> GCC
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<p>
|
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The GNU Compiler Collection must be installed with C and C++ language
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support. GCC 3.x is supported, although some effort has been made to
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support GCC 2.96.
|
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</p>
|
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|
||||
<p>
|
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Note that we currently do not support any other C++ compiler.
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</p>
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<li> GNU Make
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<p>
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The LLVM build system relies upon GNU Make extensions. Therefore, you
|
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will need GNU Make (sometimes known as gmake) to build LLVM.
|
||||
</p>
|
||||
|
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<li> Flex and Bison
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<p>
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The LLVM source code is built using flex and bison. You will not be
|
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able to configure and compile LLVM without them.
|
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</p>
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||||
</ul>
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|
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<p>
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There are some additional tools that you may want to have when working with
|
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LLVM:
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</p>
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|
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<ul>
|
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<li> GNU Autoconf and GNU M4
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<p>
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If you want to make changes to the autoconf scripts which configure LLVM
|
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for compilation, you will need GNU autoconf, and consequently, GNU M4.
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LLVM was built with autoconf 2.53, so that release and any later
|
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release should work.
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</p>
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</ul>
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<!--=====================================================================-->
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<h3><a name="quickstart"><b>Getting Started Quickly (A Summary)</b></a></h3>
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<!--=====================================================================-->
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Here's the short story for getting up and running quickly with LLVM:
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<ol>
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<li>Find the path to the CVS repository containing LLVM (we'll call this <i>CVSROOTDIR</i>).
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<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
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<li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt>
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<li><tt>cd llvm</tt>
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<li>Run <tt>configure</tt> to configure the Makefiles and header files.
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Useful options include:
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<ul>
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<li><tt>--with-objroot=<i>directory</i></tt>
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<br>
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Specifiy where object files should be placed during the build.
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<li>Build the LLVM suite
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<ol>
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<li>Find the path to the CVS repository containing LLVM (we'll call this <i>CVSROOTDIR</i>).
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<li><tt>cd <i>where-you-want-llvm-to-live</i></tt>
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<li><tt>cvs -d <i>CVSROOTDIR</i> checkout llvm</tt>
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<li><tt>cd llvm</tt>
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<li>Run <tt>configure</tt> to configure the Makefiles and header files.
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Useful options include:
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<ul>
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<li><tt>--with-objroot=<i>directory</i></tt>
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<br>
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Specify where object files should be placed during the build.
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<li><tt>--with-llvmgccdir=<i>directory</i></tt>
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<br>
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Specifiy where the LLVM C frontend has been installed.
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</ul>
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<li>Set your LLVM_LIB_SEARCH_PATH environment variable.
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<li><tt>gmake -k |& tee gnumake.out
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# this is csh or tcsh syntax</tt>
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<li><tt>--with-llvmgccdir=<i>directory</i></tt>
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<br>
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Specify where the LLVM C frontend is going to be installed.
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</ul>
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<li>Set your LLVM_LIB_SEARCH_PATH environment variable.
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<li><tt>gmake -k |& tee gnumake.out
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# this is csh or tcsh syntax</tt>
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</ol>
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<p>
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<li>Build the LLVM C Front End
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<ol>
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<li>Create a directory for the object files to live.
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<li><tt>cd <i>object file directory</i></tt>
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<li>Run <tt><i>Pathname-to-where-the-source-code-lives</i>/configure --prefix=<i>LLVMGCCDIR</i></tt> to configure GCC.
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<li><tt>make bootstrap</tt>
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<li><tt>make install</tt>
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</ol>
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</ol>
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<p>See <a href="#environment">Setting up your environment</a> on tips to
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@ -191,18 +231,94 @@
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of this document below</i>. In any of the examples below, simply replace
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each of these names with the appropriate pathname on your local system.
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All these paths are absolute:</p>
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<ul>
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</ul>
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<dl compact>
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<dt>CVSROOTDIR
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<dd>
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This is the path for the CVS repository containing the LLVM source
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code. Ask the person responsible for your local LLVM installation to
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give you this path.
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<p>
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<dt>OBJ_ROOT
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<dd>
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This is the top level directory for where the LLVM suite object files
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will be placed during the build.
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<p>
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<dt>LLVMGCCDIR
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<dd>
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This is the pathname to the location where the LLVM C Front End will
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be installed. Note that the C front end does not need to be installed
|
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during the LLVM suite build; you will just need to know where it will
|
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go for configuring the build system and running the test suite later.
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<p>
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<dt>GCCSRC
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<dd>
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This is the pathname of the directory where the LLVM C front end source
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code can be found.
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<p>
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<dt>GCCOBJ
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<dd>
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This is the pathname of the directory where the LLVM C front end object
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code will be placed during the build. It can be safely removed once
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the build is complete.
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</dl>
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<!------------------------------------------------------------------------->
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<h3><a name="environment">Setting up your environment</a></h3>
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<!------------------------------------------------------------------------->
|
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|
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<p>
|
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In order to compile and use LLVM, you will need to set some environment
|
||||
variables. There are also some shell aliases which you may find useful.
|
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You can set these on the command line, or better yet, set them in your
|
||||
<tt>.cshrc</tt> or <tt>.profile</tt>.
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<dl compact>
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<dt><tt>LLVM_LIB_SEARCH_PATH</tt>=<tt><i>LLVMGCCDIR</i>/llvm-gcc/bytecode-libs</tt>
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<dd>
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This environment variable helps the LLVM C front end find bytecode
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libraries that it will need for compilation.
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<p>
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<dt><tt>PATH</tt>=<tt>${PATH}:<i>OBJ_ROOT</i>/llvm/tools/Debug</tt>
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<dd>
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Adding this directory to the end of your path will allow the
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compilation of the C front end to find the LLVM tools. The LLVM tools
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are needed for the C front end compile.
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<p>
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<dt><tt>CC</tt>=<i>Pathname to your GCC compiler</i>
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<dd>
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The GCC compiler that you want to use must be the first C compiler in
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your <tt>PATH</tt>. Otherwise, set this variable so that
|
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<tt>configure</tt> will use the GCC compiler that you want to use.
|
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<p>
|
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<dt><tt>CXX</tt>=<i>Pathname to your GCC C++ compiler</i>
|
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<dd>
|
||||
The GCC compiler that you want to use must be the first C++ compiler in
|
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your <tt>PATH</tt>. Otherwise, set this variable so that
|
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<tt>configure</tt> will use the GCC compiler that you want to use.
|
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<p>
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|
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<dt><tt>CVSROOT</tt>=<i>CVSROOT</i>
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<dd>
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This environment variable tells CVS where to find the CVS repository.
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<p>
|
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<dt>alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt>
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<dd>
|
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This alias allows you to use the LLVM C front end without putting it in
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your <tt>PATH</tt> or typing in its complete pathname.
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||||
</dl>
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||||
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||||
<!------------------------------------------------------------------------->
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<h3><a name="checkout">Checkout LLVM from CVS</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
<p>Before checking out the source code, you will need to know the path to
|
||||
the CVS repository containing the LLVM source code (we'll call this
|
||||
<i>CVSROOTDIR</i> below). Ask the person responsible for your local LLVM
|
||||
installation to give you this path.
|
||||
|
||||
<p>To get a fresh copy of the entire source code, all you
|
||||
need to do is check it out from CVS as follows:
|
||||
<ul>
|
||||
@ -214,13 +330,19 @@
|
||||
directory and fully populate it with the LLVM source code, Makefiles,
|
||||
test directories, and local copies of documentation files.</p>
|
||||
|
||||
<p>
|
||||
Note that the C front end is not included in the CVS repository. You
|
||||
should have either downloaded the source, or better yet, downloaded the
|
||||
binary distribution for your platform.
|
||||
</p>
|
||||
|
||||
<!------------------------------------------------------------------------->
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||||
<h3><a name="config">Local Configuration Options</a></h3>
|
||||
<h3><a name="config">Local LLVM Configuration</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
<p>Once checked out from the CVS repository, options and pathnames specific
|
||||
to an installation of LLVM can be set via the <tt>configure</tt> script.
|
||||
This script sets variables in <tt>llvm/Makefile.config</tt> and
|
||||
<p>Once checked out from the CVS repository, the LLVM suite source code
|
||||
must be configured via the <tt>configure</tt> script. This script sets
|
||||
variables in <tt>llvm/Makefile.config</tt> and
|
||||
<tt>llvm/include/Config/config.h</tt>.
|
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||||
<p>
|
||||
@ -229,102 +351,250 @@
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</p>
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||||
|
||||
<ul>
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||||
<p><li><i>CXX</i> = Pathname of the C++ compiler to use.
|
||||
<p><li><i>CC</i> = Pathname of the C compiler to use.
|
||||
<p><li><i>CXX</i> = Pathname of the C++ compiler to use.
|
||||
<p><li><i>CC</i> = Pathname of the C compiler to use.
|
||||
</ul>
|
||||
|
||||
The following options can be used to set or enable LLVM specific options:
|
||||
|
||||
<ul>
|
||||
<p><li><i>--with-objroot=LLVM_OBJ_ROOT</i> =
|
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<dl compact>
|
||||
<dt><i>--with-objroot=OBJ_ROOT</i>
|
||||
<dd>
|
||||
Path to the directory where
|
||||
object files, libraries, and executables should be placed.
|
||||
If this is set to <tt>.</tt>, then the object files will be placed
|
||||
within the source code tree. If left unspecified, the default value is
|
||||
<tt>.</tt>.
|
||||
(See the Section on <a href=#objfiles>
|
||||
The location for LLVM object files</a>
|
||||
for more information.)
|
||||
<p><li><i>--with-llvmgccdir=LLVMGCCDIR</i> =
|
||||
Path to the location of the LLVM front-end
|
||||
binaries and associated libraries.
|
||||
<p><li><i>--enable-optimized</i> =
|
||||
<p>
|
||||
<dt><i>--with-llvmgccdir=LLVMGCCDIR</i>
|
||||
<dd>
|
||||
Path to the location where the LLVM C front end binaries and
|
||||
associated libraries will be installed.
|
||||
<p>
|
||||
<dt><i>--enable-optimized</i>
|
||||
<dd>
|
||||
Enables optimized compilation (debugging symbols are removed and GCC
|
||||
optimization flags are enabled).
|
||||
<p><li><i>--enable-jit</i> =
|
||||
optimization flags are enabled). The default is to use an unoptimized
|
||||
build (also known as a debug build).
|
||||
<p>
|
||||
<dt><i>--enable-jit</i>
|
||||
<dd>
|
||||
Compile the Just In Time (JIT) functionality. This is not available
|
||||
on all platforms.
|
||||
</ul>
|
||||
on all platforms. The default is dependent on platform, so it is best
|
||||
to explicitly enable it if you want it.
|
||||
</dl>
|
||||
|
||||
In addition to running <tt>configure</tt>, you must set the
|
||||
<tt>LLVM_LIB_SEARCH_PATH</tt> environment variable in your startup scripts.
|
||||
This environment variable is used to locate "system" libraries like
|
||||
"<tt>-lc</tt>" and "<tt>-lm</tt>" when linking. This variable should be set
|
||||
to the absolute path for the bytecode-libs subdirectory of the C front-end
|
||||
install. For example, one might set <tt>LLVM_LIB_SEARCH_PATH</tt> to
|
||||
install, or LLVMGCCDIR/llvm-gcc/bytecode-libs. For example, one might
|
||||
set <tt>LLVM_LIB_SEARCH_PATH</tt> to
|
||||
<tt>/home/vadve/lattner/local/x86/llvm-gcc/bytecode-libs</tt> for the X86
|
||||
version of the C front-end on our research machines.<p>
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="compile">Compiling the LLVM Suite Source Code</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
Once you have configured LLVM, you can build it. There are three types of
|
||||
builds:
|
||||
|
||||
<dl compact>
|
||||
<dt>Debug Builds
|
||||
<dd>
|
||||
These builds are the default. They compile the tools and libraries
|
||||
with debugging information.
|
||||
<p>
|
||||
|
||||
<dt>Release (Optimized) Builds
|
||||
<dd>
|
||||
These builds are enabled with the <tt>--enable-optimized</tt> option to
|
||||
<tt>configure</tt>. They compile the tools and libraries with GCC
|
||||
optimizer flags on and strip debugging information from the libraries
|
||||
and executables it generates.
|
||||
<p>
|
||||
|
||||
<dt>Profile Builds
|
||||
<dd>
|
||||
These builds are for use with profiling. They compile profiling
|
||||
information into the code for use with programs like <tt>gprof</tt>.
|
||||
Profile builds must be started by setting variables on the
|
||||
<tt>make</tt> command line.
|
||||
</dl>
|
||||
|
||||
Once you have LLVM configured, you can build it by entering the top level
|
||||
<tt>llvm</tt> directory and issuing the following command:
|
||||
<p>
|
||||
<tt>make</tt>
|
||||
|
||||
<p>
|
||||
If you have multiple processors in your machine, you may wish to use some
|
||||
of the parallel build options provided by GNU Make. For example, you could
|
||||
use the command:
|
||||
</p>
|
||||
|
||||
<p>
|
||||
<tt>make -j2</tt>
|
||||
|
||||
<p>
|
||||
There are several other targets which are useful when working with the LLVM
|
||||
source code:
|
||||
|
||||
<dl compact>
|
||||
<dt><tt>make clean</tt>
|
||||
<dd>
|
||||
Removes all files generated by the build. This includes object files,
|
||||
generated C/C++ files, libraries, and executables.
|
||||
<p>
|
||||
|
||||
<dt><tt>make distclean</tt>
|
||||
<dd>
|
||||
Removes everything that <tt>make clean</tt> does, but also removes
|
||||
files generated by <tt>configure</tt>. It attempts to return the
|
||||
source tree to the original state in which it was shipped.
|
||||
<p>
|
||||
</dl>
|
||||
|
||||
It is also possible to override default values from <tt>configure</tt> by
|
||||
declaring variables on the command line. The following are some examples:
|
||||
|
||||
<dl compact>
|
||||
<dt><tt>make ENABLE_OPTIMIZED=1</tt>
|
||||
<dd>
|
||||
Perform a Release (Optimized) build.
|
||||
<p>
|
||||
|
||||
<dt><tt>make ENABLE_PROFILING=1</tt>
|
||||
<dd>
|
||||
Perform a Profiling build.
|
||||
<p>
|
||||
|
||||
<dt><tt>make VERBOSE=1</tt>
|
||||
<dd>
|
||||
Print what <tt>make</tt> is doing on standard output.
|
||||
<p>
|
||||
</dl>
|
||||
|
||||
Every directory in the LLVM source tree includes a <tt>Makefile</tt> to
|
||||
build it and any subdirectories that it contains. Entering any directory
|
||||
inside the LLVM source tree and typing <tt>make</tt> should rebuild
|
||||
anything in or below that directory that is out of date.
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="build">Building the LLVM C Front End</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
<b>
|
||||
<p>
|
||||
This step is optional if you have the C front end binary distrubtion for
|
||||
your platform.
|
||||
</p>
|
||||
</b>
|
||||
|
||||
Now that you have the LLVM Suite built, you can build the C front end. For
|
||||
those of you that have built GCC before, the process is very similar.
|
||||
<p>
|
||||
Be forewarned, though: the build system for the C front end is not as
|
||||
polished as the rest of the LLVM code, so there will be many warnings and
|
||||
errors that you will need to ignore for now:
|
||||
|
||||
<ol>
|
||||
<li>Ensure that <tt><i>OBJ_ROOT</i>/llvm/tools/Debug</tt> is at the
|
||||
<i>end</i> of your <tt>PATH</tt> environment variable.
|
||||
|
||||
<li><tt>cd <i>GCCOBJ</i></tt>
|
||||
|
||||
<li>Configure the source code:
|
||||
<ul>
|
||||
<li>On Linux/x86, use
|
||||
<ul>
|
||||
<li><tt><i>GCCSRC</i>/configure --prefix=<i>LLVMGCCDIR</i>
|
||||
--enable-languages=c</tt>
|
||||
</ul>
|
||||
|
||||
<li>On Solaris/Sparc, use
|
||||
<ul>
|
||||
<li><tt><i>GCCSRC</i>/configure --prefix=<i>LLVMGCCDIR</i>
|
||||
--enable-languages=c --target=sparcv9-sun-solaris2</tt>
|
||||
</ul>
|
||||
</ul>
|
||||
|
||||
<li><tt>make bootstrap</tt>
|
||||
|
||||
<li>The build will eventually fail. Don't worry; chances are good that
|
||||
everything that needed to build is built.
|
||||
|
||||
<li><tt>make install</tt>
|
||||
</ol>
|
||||
|
||||
At this point, you should have a working copy of the LLVM C front end
|
||||
installed in <i>LLVMGCCDIR</i>.
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="objfiles">The location for LLVM object files</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
<p>The LLVM make system sends most output files generated during the build
|
||||
into the directory defined by the variable OBJ_ROOT in
|
||||
<tt>llvm/Makefile.config</tt>. This can be either just your normal LLVM
|
||||
<p>The LLVM build system sends most output files generated during the build
|
||||
into the directory defined by the variable <i>OBJ_ROOT</i> in
|
||||
<tt>llvm/Makefile.config</tt>, which is set by the <i>--with-objroot</i>
|
||||
option in <tt>configure</tt>. This can be either just your normal LLVM
|
||||
source tree or some other directory writable by you. You may wish to put
|
||||
object files on a different filesystem either to keep them from being backed
|
||||
up or to speed up local builds.
|
||||
|
||||
<p>If you wish to place output files into a separate directory, use the
|
||||
<tt>--with-objroot=<i>directory</i></tt> option of <tt>configure</tt> to
|
||||
set the top level directory of where the object files will go. Otherwise,
|
||||
leave this option unspecified, and <tt>configure</tt> will place files
|
||||
within the LLVM source tree.
|
||||
<p>
|
||||
If <i>OBJ_ROOT</i> is specified, then the build system will create a
|
||||
directory tree underneath it that resembles the source code's pathname
|
||||
relative to your home directory.
|
||||
</p>
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="environment">Setting up your environment</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
<p>
|
||||
For example, suppose that <i>OBJ_ROOT</i> is set to <tt>/tmp</tt> and the
|
||||
LLVM suite source code is located in <tt>/usr/home/joe/src/llvm</tt>, where
|
||||
<tt>/usr/home/joe</tt> is the home directory of a user named Joe. Then,
|
||||
the object files will be placed in <tt>/tmp/src/llvm</tt>.
|
||||
</p>
|
||||
|
||||
<i>NOTE: This step is optional but will set up your environment so you
|
||||
can use the compiled LLVM tools with as little hassle as
|
||||
possible.</i>)
|
||||
<p>
|
||||
The LLVM build will place files underneath <i>OBJ_ROOT</i> in directories
|
||||
named after the build type:
|
||||
</p>
|
||||
|
||||
<p>Add the following lines to your <tt>.cshrc</tt> (or the corresponding
|
||||
lines to your <tt>.profile</tt> if you use a bourne shell derivative).
|
||||
|
||||
<pre>
|
||||
# Make the C front end easy to use...
|
||||
alias llvmgcc <i>LLVMGCCDIR</i><tt>/bin/llvm-gcc</tt>
|
||||
|
||||
# Make the LLVM tools easy to use...
|
||||
setenv PATH <i>OBJ_ROOT</i>/llvm/tools/Debug:${PATH}
|
||||
</pre>
|
||||
The <tt>llvmgcc</tt> alias is useful because the C compiler is not
|
||||
included in the CVS tree you just checked out.
|
||||
|
||||
<p>The other <a href="#tools">LLVM tools</a> are part of the LLVM
|
||||
source base and built when compiling LLVM. They will be built into the
|
||||
<tt><i>OBJ_ROOT</i>/tools/Debug</tt> directory.</p>
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="compile">Compiling the source code</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
<p>Every directory in the LLVM source tree includes a <tt>Makefile</tt> to
|
||||
build it and any subdirectories that it contains. These makefiles require
|
||||
that you use GNU Make (sometimes called <tt>gmake</tt>) instead of
|
||||
<tt>make</tt> to
|
||||
build them, but can
|
||||
otherwise be used freely. To build the entire LLVM system, just enter the
|
||||
top level <tt>llvm</tt> directory and type <tt>gmake</tt>. A few minutes
|
||||
later you will hopefully have a freshly compiled toolchain waiting for you
|
||||
in <tt><i>OBJ_ROOT</i>/llvm/tools/Debug</tt>. If you want to look at the
|
||||
libraries that
|
||||
were compiled, look in <tt><i>OBJ_ROOT</i>/llvm/lib/Debug</tt>.</p>
|
||||
|
||||
If you get an error about a <tt>/localhome</tt> directory, follow the
|
||||
instructions in the section about <a href="#environment">Setting Up Your
|
||||
Environment.</a>
|
||||
<dl compact>
|
||||
<dt>Debug Builds
|
||||
<dd>
|
||||
<dl compact>
|
||||
<dt>Tools
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/tools/Debug</tt>
|
||||
<dt>Libraries
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/lib/Debug</tt>
|
||||
</dl>
|
||||
<p>
|
||||
|
||||
<dt>Release Builds
|
||||
<dd>
|
||||
<dl compact>
|
||||
<dt>Tools
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/tools/Release</tt>
|
||||
<dt>Libraries
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/lib/Release</tt>
|
||||
</dl>
|
||||
<p>
|
||||
|
||||
<dt>Profile Builds
|
||||
<dd>
|
||||
<dl compact>
|
||||
<dt>Tools
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/tools/Profile</tt>
|
||||
<dt>Libraries
|
||||
<dd><tt><i>OBJ_ROOT</i>/llvm/lib/Profile</tt>
|
||||
</dl>
|
||||
</dl>
|
||||
|
||||
<!--=====================================================================-->
|
||||
<center>
|
||||
@ -332,7 +602,7 @@
|
||||
</center>
|
||||
<!--=====================================================================-->
|
||||
|
||||
<p>One useful source of infomation about the LLVM sourcebase is the LLVM <a
|
||||
<p>One useful source of information about the LLVM source base is the LLVM <a
|
||||
href="http://www.doxygen.org">doxygen</a> documentation, available at <tt><a
|
||||
href="http://llvm.cs.uiuc.edu/doxygen/">http://llvm.cs.uiuc.edu/doxygen/</a></tt>. The
|
||||
following is a brief introduction to code layout:</p>
|
||||
@ -346,25 +616,6 @@
|
||||
for the most part these can just be ignored.
|
||||
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="ddr"><tt>Depend</tt>, <tt>Debug</tt>, & <tt>Release</tt>
|
||||
directories</a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
|
||||
If you are building with the "<tt>OBJ_ROOT=.</tt>" option enabled in the
|
||||
<tt>Makefile.config</tt> file (i.e. you did not specify
|
||||
<tt>--with-objroot</tt> when you ran <tt>configure</tt>), most source
|
||||
directories will contain two
|
||||
directories, <tt>Depend</tt> and <tt>Debug</tt>. The <tt>Depend</tt>
|
||||
directory contains automatically generated dependance files which are used
|
||||
during compilation to make sure that source files get rebuilt if a header
|
||||
file they use is modified. The <tt>Debug</tt> directory holds the object
|
||||
files, library files, and executables that are used for building a debug
|
||||
enabled build. The <tt>Release</tt> directory is created to hold the same
|
||||
files when the <tt>ENABLE_OPTIMIZED=1</tt> flag is passed to <tt>gmake</tt>,
|
||||
causing an optimized build to be performed.<p>
|
||||
|
||||
|
||||
<!------------------------------------------------------------------------->
|
||||
<h3><a name="include"><tt>llvm/include</tt></a></h3>
|
||||
<!------------------------------------------------------------------------->
|
||||
@ -379,7 +630,7 @@
|
||||
<tt>Reoptimizer</tt>, <tt>Target</tt>, <tt>Transforms</tt>, etc...
|
||||
|
||||
<li><tt>llvm/include/Support</tt> - This directory contains generic
|
||||
support libraries that are independant of LLVM, but are used by LLVM.
|
||||
support libraries that are independent of LLVM, but are used by LLVM.
|
||||
For example, some C++ STL utilities and a Command Line option processing
|
||||
library.
|
||||
|
||||
@ -466,7 +717,7 @@
|
||||
|
||||
<dt><tt><b>lli</b></tt><dd> <tt>lli</tt> is the LLVM interpreter, which
|
||||
can directly execute LLVM bytecode (although very slowly...). In addition
|
||||
to a simple intepreter, <tt>lli</tt> is also has debugger and tracing
|
||||
to a simple interpreter, <tt>lli</tt> is also has debugger and tracing
|
||||
modes (entered by specifying <tt>-debug</tt> or <tt>-trace</tt> on the
|
||||
command line, respectively).<p>
|
||||
|
||||
@ -491,7 +742,7 @@
|
||||
disassembled or manipulated just like any other bytecode file). The
|
||||
command line interface to <tt>gccas</tt> is designed to be as close as
|
||||
possible to the <b>system</b> '<tt>as</tt>' utility so that the gcc
|
||||
frontend itself did not have to be modified to interface to a "wierd"
|
||||
frontend itself did not have to be modified to interface to a "weird"
|
||||
assembler.<p>
|
||||
|
||||
<dt><tt><b>gccld</b></tt><dd> <tt>gccld</tt> links together several LLVM
|
||||
@ -570,6 +821,58 @@
|
||||
</ol>
|
||||
|
||||
|
||||
<!--=====================================================================-->
|
||||
<h2><a name="help">Common Problems</a></h2>
|
||||
<!--=====================================================================-->
|
||||
|
||||
Below are common problems and their remedies:
|
||||
|
||||
<dl compact>
|
||||
<dt><b>When I run configure, it finds the wrong C compiler.</b>
|
||||
<dd>
|
||||
The <tt>configure</tt> script attempts to locate first <tt>gcc</tt> and
|
||||
then <tt>cc</tt>, unless it finds compiler paths set in <tt>CC</tt> and
|
||||
<tt>CXX</tt> for the C and C++ compiler, respectively.
|
||||
|
||||
If <tt>configure</tt> finds the wrong compiler, either adjust your
|
||||
<tt>PATH</tt> environment variable or set <tt>CC</tt> and <tt>CXX</tt>
|
||||
explicitly.
|
||||
<p>
|
||||
|
||||
<dt><b>I compile the code, and I get some error about /localhome</b>.
|
||||
<dd>
|
||||
There are several possible causes for this. The first is that you
|
||||
didn't set a pathname properly when using <tt>configure</tt>, and it
|
||||
defaulted to a pathname that we use on our research machines.
|
||||
<p>
|
||||
Another possibility is that we hardcoded a path in our Makefiles. If
|
||||
you see this, please email the LLVM bug mailing list with the name of
|
||||
the offending Makefile and a description of what is wrong with it.
|
||||
|
||||
<dt><b>The <tt>configure</tt> script finds the right C compiler, but it
|
||||
uses the LLVM linker from a previous build. What do I do?</b>
|
||||
<dd>
|
||||
The <tt>configure</tt> script uses the <tt>PATH</tt> to find
|
||||
executables, so if it's grabbing the wrong linker/assembler/etc, there
|
||||
are two ways to fix it:
|
||||
<ol>
|
||||
<li>Adjust your <tt>PATH</tt> environment variable so that the
|
||||
correct program appears first in the <tt>PATH</tt>. This may work,
|
||||
but may not be convenient when you want them <i>first</i> in your
|
||||
path for other work.
|
||||
<p>
|
||||
|
||||
<li>Run <tt>configure</tt> with an alternative <tt>PATH</tt> that
|
||||
is correct. In a Borne compatible shell, the syntax would be:
|
||||
<p>
|
||||
<tt>PATH=<the path without the bad program> ./configure ...</tt>
|
||||
<p>
|
||||
This is still somewhat inconvenient, but it allows
|
||||
<tt>configure</tt> to do its work without having to adjust your
|
||||
<tt>PATH</tt> permanently.
|
||||
</ol>
|
||||
</dl>
|
||||
|
||||
<!--=====================================================================-->
|
||||
<h2><a name="links">Links</a></h2>
|
||||
<!--=====================================================================-->
|
||||
@ -583,6 +886,7 @@
|
||||
<ul>
|
||||
<li><a href="http://llvm.cs.uiuc.edu/">LLVM homepage</a></li>
|
||||
<li><a href="http://llvm.cs.uiuc.edu/doxygen/">LLVM doxygen tree</a></li>
|
||||
<li><a href="http://llvm.cs.uiuc.edu/docs/Projects.html">Starting a Project that Uses LLVM</a></li>
|
||||
</ul>
|
||||
|
||||
<hr>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user