mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
222 lines
7.0 KiB
HTML
222 lines
7.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<title>Creating an LLVM Project</title>
|
|
</head>
|
|
|
|
<body bgcolor=white>
|
|
|
|
<center><h1>Creating an LLVM Project<br></h1></center>
|
|
|
|
<!--===============================================================-->
|
|
<h2><a name="a">Overview</a><hr></h2>
|
|
<!--===============================================================-->
|
|
|
|
In order to set up a new project that uses the LLVM build system,
|
|
libraries, and header files, follow these steps:
|
|
|
|
<ol>
|
|
<li>
|
|
Copy the <tt>llvm/projects/sample</tt> directory to any place
|
|
of your choosing. You can place it anywhere you like, although
|
|
someplace underneath your home directory would work best.
|
|
<p>
|
|
|
|
<li>
|
|
Edit the <tt>Makefile.config</tt> and <tt>Makefile.common</tt>
|
|
files so that the LLVM_SRC_ROOT variable equals the absolute
|
|
pathname of the LLVM source tree and LLVM_OBJ_ROOT equals the
|
|
pathname of where LLVM was built.
|
|
|
|
<p>
|
|
|
|
For example, if the LLVM source tree is in
|
|
<tt>/usr/home/joe/src/llvm</tt>, and you configured it with
|
|
<tt>--with-objroot=/tmp</tt> when his home directory is
|
|
<tt>/usr/home/joe</tt>, then
|
|
LLVM_SRC_ROOT=<tt>/usr/home/joe/src/llvm</tt> and
|
|
LLVM_OBJ_ROOT=<tt>/tmp/src/llvm</tt>.
|
|
<p>
|
|
|
|
<li>
|
|
Add your source code to the source tree.
|
|
<p>
|
|
|
|
<li>
|
|
Modify the various Makefiles to contain the names of the
|
|
objects that you want to build.
|
|
</ol>
|
|
|
|
<!--===============================================================-->
|
|
<h2><a name="Source Tree Layout">Source Tree Layout</a><hr></h2>
|
|
<!--===============================================================-->
|
|
|
|
In order to use the LLVM build system, you will want to lay out your
|
|
source code so that it can benefit from the build system's features.
|
|
Mainly, you want your source tree layout to look similar to the LLVM
|
|
source tree layout. The best way to do this is to just copy the
|
|
project tree from <tt>llvm/projects/sample</tt> and modify it to meet
|
|
your needs, but you can certainly add to it if you want.
|
|
|
|
Underneath your top level directory, you should have the following
|
|
directories:
|
|
|
|
<dl compact>
|
|
<dt><b>lib</b>
|
|
<dd>
|
|
This subdirectory should contain all of your library source
|
|
code. For each library that you build, you will have one
|
|
directory in <b>lib</b> that will contain that library's source
|
|
code.
|
|
|
|
<p>
|
|
Libraries can be object files, archives, or dynamic libraries.
|
|
The <b>lib</b> directory is just a good place for these as it
|
|
places them all in a directory from which they can be linked
|
|
later on.
|
|
|
|
<dt><b>include</b>
|
|
<dd>
|
|
This subdirectory should contain any header files that are
|
|
global to your project. By global, we mean that they are used
|
|
by more than one library or executable of your project.
|
|
<p>
|
|
By placing your header files in <b>include</b>, they will be
|
|
found automatically by the LLVM build system. For example, if
|
|
you have a file <b>include/jazz/note.h</b>, then your source
|
|
files can include it simply with <b>#include "jazz/note.h"</b>.
|
|
|
|
<dt><b>tools</b>
|
|
<dd>
|
|
This subdirectory should contain all of your source
|
|
code for executables. For each program that you build, you
|
|
will have one directory in <b>tools</b> that will contain that
|
|
program's source code.
|
|
</dl>
|
|
|
|
Typically, you will want to build your <b>lib</b> directory first
|
|
followed by your <b>tools</b> directory.
|
|
|
|
<!--===============================================================-->
|
|
<h2><a name="Makefile Variables">Makefile Variables</a><hr></h2>
|
|
<!--===============================================================-->
|
|
The LLVM build system provides several variables which you may
|
|
use.
|
|
|
|
<h3> Required Variables </h3>
|
|
<dl compact>
|
|
<dt>LEVEL
|
|
<dd>
|
|
This variable is the relative path from this Makefile to the
|
|
top directory of your project's source code. For example, if
|
|
your source code is in /tmp/src, then the Makefile in
|
|
/tmp/src/jump/high would set LEVEL to "../..".
|
|
</dl>
|
|
|
|
<h3> Variables for Building Subdirectories</h3>
|
|
<dl compact>
|
|
<dt>DIRS
|
|
<dd>
|
|
This is a space separated list of subdirectories that should be
|
|
built. They will be built, one at a time, in the order
|
|
specified.
|
|
<p>
|
|
|
|
<dt>PARALLEL_DIRS
|
|
<dd>
|
|
This is a list of directories that can be built in parallel.
|
|
These will be built after the directories in DIRS have been
|
|
built.
|
|
<p>
|
|
|
|
<dt>OPTIONAL_DIRS
|
|
<dd>
|
|
This is a list of directories that can be built if they exist,
|
|
but will not cause an error if they do not exist. They are
|
|
built serially in the order in which they are listed.
|
|
</dl>
|
|
|
|
<h3> Variables for Building Libraries</h3>
|
|
<dl compact>
|
|
<dt>LIBRARYNAME
|
|
<dd>
|
|
This variable contains the base name of the library that will
|
|
be built. For example, to build a library named
|
|
<tt>libsample.a</tt>, LIBRARYNAME should be set to
|
|
<tt>sample</tt>.
|
|
<p>
|
|
|
|
<dt>BUILD_ARCHIVE
|
|
<dd>
|
|
By default, a library is a <tt>.o</tt> file that is linked
|
|
directly into a program. However, if you set the BUILD_ARCHIVE
|
|
variable, an archive library (sometimes known as a static
|
|
library) will be built instead.
|
|
<p>
|
|
|
|
<dt>SHARED_LIBRARY
|
|
<dd>
|
|
If SHARED_LIBRARY is defined in your Makefile, then the
|
|
Makefiles will generate a shared (or dynamic) library.
|
|
</dl>
|
|
|
|
<h3> Variables for Building Programs</h3>
|
|
<dl compact>
|
|
<dt>TOOLNAME
|
|
<dd>
|
|
This variable contains the name of the program that will
|
|
be built. For example, to build an executable named
|
|
<tt>sample</tt>, TOOLNAME should be set to <tt>sample</tt>.
|
|
<p>
|
|
|
|
<dt>USEDLIBS
|
|
<dd>
|
|
This variable holds a space separated list of libraries that
|
|
should be linked into the program. These libraries must either
|
|
be LLVM libraries or libraries that come from your <b>lib</b>
|
|
directory. The libraries must be specified by their base name.
|
|
For example, to link libsample.a, you would set USEDLIBS to
|
|
<tt>sample</tt>.
|
|
<p>
|
|
</dl>
|
|
|
|
<h3> Miscellaneous Variables</h3>
|
|
<dl compact>
|
|
<dt>ExtraSource
|
|
<dd>
|
|
This variable contains a space separated list of extra source
|
|
files that needs to be built. It is useful for including the
|
|
output of Lex and Yacc programs.
|
|
<p>
|
|
|
|
<dt>CFLAGS
|
|
<dt>CPPFLAGS
|
|
<dd>
|
|
This variable can be used to add options to the C and C++
|
|
compiler, respectively. It is typically used to add options
|
|
that tell the compiler the location of additional directories
|
|
to search for header files.
|
|
<p>
|
|
It is highly suggested that you append to these variable as
|
|
opposed to overwriting them. The master Makefiles may already
|
|
have useful options in them that you may not want to overwrite.
|
|
<p>
|
|
</dl>
|
|
|
|
<!--===============================================================-->
|
|
<h2><a name="Caveats">Caveats</a><hr></h2>
|
|
<!--===============================================================-->
|
|
|
|
Some caveats and known issues:
|
|
<ol>
|
|
<li>
|
|
The projects system currently uses the $HOME environment
|
|
variable in determining where object files should go. If $HOME
|
|
is not set, then your path relative to the root directory may
|
|
be used to determine where your object files go. It is
|
|
therefore advised that your source directory reside underneath
|
|
your home directory.
|
|
</ol>
|
|
</body>
|
|
</html>
|