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  <h1>          dmd - FreeBSD D Compiler</h1>
  	<ul>	
	
	
	<li>dmd for <a href="dmd-windows.html">Windows</a></li>
	<li>dmd for <a href="dmd-linux.html">  Linux</a></li>
	<li>dmd for <a href="dmd-osx.html">    OSX</a></li>
	<li><a href="#requirements">Requirements and Downloads</a></li>
	<li><a href="#files">Files</a></li>
	<li><a href="#installation">Installation</a></li>
	
	<li><a href="#switches">Compiler Arguments and Switches</a></li>
	<li><a href="#linking">Linking</a></li>
	<li><a href="#environment">Environment Variables</a></li>
	
	<li><a href="#dmd_conf">dmd.conf</a> Initialization File</li>
	
	<li><a href="#differences">Differences between Windows and Linux versions</a></li>
	<li><a href="#interface_files">D Interface Files</a></li>
	<li><a href="#library">Building Libraries</a></li>
	<li><a href="#compiling_dmd">Compiling dmd</a></li>
	<li><a href="#compiling_phobos">Compiling Phobos</a></li>
	</ul>

<h2><a name="requirements">Requirements and Downloads</a></h2>

	<ol><li><a href="http://www.digitalmars.com/d/download.html">Download D Compiler</a></li>

    
    <li>32 bit x86 FreeBSD 7.1 operating system</li>

	<li>Gnu C compiler (gcc)</li>
    
	</ol>

<h2><a name="files">Files</a></h2>

	<dl>	<dt><tt>dmd2/src/phobos/</tt>
	<dd>D runtime library source</dd>
	</dt>

	<dt><tt>dmd2/src/dmd/</tt>
	<dd>D compiler front end source under dual (GPL and Artistic) license</dd>
	</dt>

	<dt><tt>dmd2/html/d/</tt>
	<dd>Documentation</dd>
	</dt>

	<dt><tt>dmd2/samples/d/</tt>
	<dd>Sample D programs</dd>
	</dt>
    
    
    <dt><tt>dmd2/freebsd/bin/dmd</tt>
	<dd>D compiler executable</dd>
	</dt>

	<dt><tt>dmd2/freebsd/bin/<a href="http://www.digitalmars.com/ctg/dumpobj.html">dumpobj</a></tt>
	<dd>Elf file dumper</dd>
	</dt>

	<dt><tt>dmd2/freebsd/bin/<a href="http://www.digitalmars.com/ctg/obj2asm.html">obj2asm</a></tt>
	<dd>Elf file disassembler</dd>
	</dt>

	<dt><tt>dmd2/freebsd/bin/<a href="http://www.digitalmars.com/ctg/shell.html">shell</a></tt>
	<dd>Simple command line shell</dd>
	</dt>

	<dt><tt>dmd2/freebsd/bin/<a href="#dmd_conf">dmd.conf</a></tt>
	<dd>Global compiler settings (copy to <tt>/etc/dmd.conf</tt>)</dd>
	</dt>

	<dt><tt>dmd2/freebsd/lib/libphobos2.a</tt>
	<dd>D runtime library (copy to <tt>/usr/lib/libphobos2.a</tt>)</dd>
	</dt>
    
    
	</dl>

<h2><a name="installation">Installation</a></h2>

    
    <li>Unzip the archive into your home directory.
	It will create
	a <tt>~/dmd</tt> directory with all the files in it.
	All the tools are command line tools, which means
	they are run from a console window.</li>

	<li>Copy <tt><a href="#dmd_conf">dmd.conf</a></tt> to <tt>/etc</tt>:

<pre class="console"><span class="notranslate">cp dmd2/freebsd/bin/dmd.conf /etc
</span></pre>
	</li>

	<li>Put <tt>dmd2/freebsd/bin</tt> on your <b>PATH</b>,
	or copy the FreeBSD executables
	to <tt>/usr/local/bin</tt></li>

	<li>Copy the library to <tt>/usr/lib</tt>:

<pre class="console"><span class="notranslate">cp dmd2/freebsd/lib/libphobos2.a /usr/lib
</span></pre>
	</li>
    
    
<h2><a name="switches">Compiler Arguments and Switches</a></h2>

	<dl>  <dt><b>dmd</b> <i>files</i>... -<i>switches</i>...
		<dd></dd>
	  </dt>

	  <dt><i>files</i>...
		<dd>	<table border=1 cellpadding=4 cellspacing=0><caption>File Extensions</caption>		<tr>	<th scope="col">Extension</th>
		<th scope="col">File Type</th>
		</tr>
		<tr>	<td><i>none</i></td>
		<td>D source files</td>
		</tr>
		<tr>	<td><b>.d</b></td>
		<td>D source files</td>
		</tr>
		<tr>	<td><b>.dd</b></td>
		<td><a href="ddoc.html">Ddoc</a> source files</td>
		</tr>
		<tr>	<td><b>.di</b></td>
		<td><a href="#interface_files">D interface files</a></td>
		</tr>
		<tr>	<td><b>.o</b></td>
		<td>Object files to link in</td>
		</tr>
		<tr>	<td><b>.a</b></td>
		<td>Object code libraries to search</td>
		</tr>

		</table>
		</dd>
	  </dt>

	  <dt><b>@</b><i>cmdfile</i></dt><dd>	If <i>cmdfile</i> is an environment variable,
		read the compiler arguments and switches from
		the value of that variable.
		Otherwise, read compiler arguments and switches from
		the text file <i>cmdfile</i>
	  </dd>

	  <dt><b>-c</b></dt><dd>	compile only, do not link
	  </dd>

	  <dt><b>-cov</b></dt><dd>	instrument for <a href="code_coverage.html">code coverage analysis</a>
	  </dd>

	  <dt><b>-D</b></dt><dd>	generate <a href="ddoc.html">documentation</a> from source
	  </dd>

	  <dt><b>-Dd</b><i>docdir</i></dt><dd>	write documentation file to <i>docdir</i> directory
	  </dd>

	  <dt><b>-Df</b><i>filename</i></dt><dd>	write documentation file to <i>filename</i>
	  </dd>

	  <dt><b>-d</b></dt><dd>	allow deprecated features
	  </dd>
	  <dt><b>-debug</b></dt><dd>	compile in <a href="version.html#debug">debug</a> code
	  </dd>
	  <dt><b>-debug=</b><i>level</i></dt><dd>	compile in <a href="version.html#debug">debug level</a> &lt;= <i>level</i>
	  </dd>
	  <dt><b>-debug=</b><i>ident</i></dt><dd>	compile in <a href="version.html#debug">debug identifier</a> <i>ident</i>
	  </dd>

	  <dt><b>-debuglib=</b><i>libname</i></dt><dd>	link in <i>libname</i> as the default library when
		compiling for symbolic debugging instead of <b>libphobos2.a</b>
	  </dd>
	  <dt><b>-defaultlib=</b><i>libname</i></dt><dd>	link in <i>libname</i> as the default library when
		not compiling for symbolic debugging instead of <b>libphobos2.a</b>
	  </dd>
	  <dt><b>-deps=</b><i>filename</i></dt><dd>	write module dependencies as text to <i>filename</i>
	  </dd>

    
      <dt><b>-fPIC</b></dt><dd>	generate Position Independent Code (which is used
		for building shared libraries).
		
	  </dd>
    

	  <dt><b>-g</b></dt><dd>   
    	add Dwarf symbolic debug info with
		<a href="abi.html#dwarf">D extensions</a>
		for debuggers 
    
	  </dd>

	  <dt><b>-gc</b></dt><dd>   
    	add Dwarf symbolic debug info in C format
		for debuggers such as
		<tt>gdb</tt>
    
	  </dd>

	  <dt><b>-H</b></dt><dd>	generate <a href="#interface_files">D interface file</a>
	  </dd>

	  <dt><b>-Hd</b><i>dir</i></dt><dd>	write D interface file to <i>dir</i> directory
	  </dd>

	  <dt><b>-Hf</b><i>filename</i></dt><dd>	write D interface file to <i>filename</i>
	  </dd>

	  <dt><b>--help</b></dt><dd>	print brief help to console
	  </dd>

	  <dt><b>-inline</b></dt><dd>	inline expand functions at the discretion of the compiler.
		This can improve performance, at the expense of making
		it more difficult to use a debugger on it.
	  </dd>

	  <dt><b>-I</b><i>path</i></dt><dd>	where to look for
		<a href="module.html#ImportDeclaration">imports</a>.
		<i>path</i> is a ; separated
		list of paths. Multiple <b>-I</b>'s can be used, and the paths
		are searched in the same order.
	  </dd>

	  <dt><b>-ignore</b></dt><dd>	ignore unsupported pragmas
	  </dd>

	  <dt><b>-J</b><i>path</i></dt><dd>	where to look for files for
		<a href="expression.html#ImportExpression"><i>ImportExpression</i></a>s.
		This switch is required in order to use <i>ImportExpression</i>s.
		<i>path</i> is a ; separated
		list of paths. Multiple <b>-J</b>'s can be used, and the paths
		are searched in the same order.
	  </dd>

	  <dt><b>-L</b><i>linkerflag</i></dt><dd>	pass <i>linkerflag</i> to the
		
		linker, for example,
		<tt>-L-M</tt>
	  </dd>

	  <dt><b>-lib</b></dt><dd>	generate library file as output instead of object file(s).
		All compiled source files, as well as object files and library
		files specified on the command line, are inserted into
		the output library.
		Compiled source modules may be partitioned into several object
		modules to improve granularity.
		The name of the library is taken from the name of the first
		source module to be compiled. This can be overridden with
		the <b>-of</b> switch.
	  </dd>

	  <dt><b>-man</b></dt><dd>   
    
    	open browser specified by the <b>BROWSER</b>
		environment variable on this page. If <b>BROWSER</b> is
		undefined, <b>x-www-browser</b> is assumed.
    
    
	  </dd>

  <dt><b>-noboundscheck</b></dt><dd>	turns off all array bounds checking, even for safe functions
	  </dd>

    
	  <dt><b>-O</b></dt><dd>	Optimize generated code. For fastest executables, compile
		with the <b>-O -release -inline</b> switches together.
	  </dd>

	  <dt><b>-o-</b></dt><dd>	Suppress generation of object file. Useful in
		conjuction with <b>-D</b> or <b>-H</b> flags.
	  </dd>

	  <dt><b>-od</b><i>objdir</i></dt><dd>	<dd>write object files relative to directory <i>objdir</i>
		instead of to the current directory</dd>
	  </dd>
	  <dt><b>-of</b><i>filename</i></dt><dd>	Set output file name to <i>filename</i> in the output
		directory. The output file can be an object file,
		executable file, or library file depending on the other
		switches.
	  </dd>
	  <dt><b>-op</b></dt><dd>	normally the path for <b>.d</b> source files is stripped
		off when generating an object file name. <b>-op</b> will leave
		it on.
	  </dd>
	  <dt><b>-profile</b></dt><dd>	<a href="http://www.digitalmars.com/ctg/trace.html">profile</a>
		the runtime performance
		of the generated code
	  </dd>
	  <dt><b>-quiet</b></dt><dd>	suppress non-essential compiler messages
	  </dd>
	  <dt><b>-release</b></dt><dd>	
		compile release version, which means not generating
		code for contracts and asserts. Array bounds checking
		is not done for system and trusted functions.
	  </dd>
	  <dt><b>-run</b> <i>srcfile args...</i>
		compile</dt><dd>link, and run the program <i>srcfile</i> with the
		rest of the
		command line, <i>args...</i>, as the arguments to the program.
		No .o or executable file is left behind.
	  </dd>

	  <dt><b>-unittest</b></dt><dd>	compile in <a href="unittest.html">unittest</a> code, turns on asserts, and sets the
		<tt>unittest</tt> <a href="version.html#PredefinedVersions">version identifier</a>
	  </dd>
	  <dt><b>-v</b></dt><dd>	verbose
	  </dd>
  <dt><b>-vtls</b></dt><dd>	print informational messages identifying variables defaulting
		to thread local storage. Handy for migrating to shared model.
	  </dd>

	  <dt><b>-version=</b><i>level</i></dt><dd>	compile in <a href="version.html#version">version level</a> &gt;= <i>level</i>
	  </dd>
	  <dt><b>-version=</b><i>ident</i></dt><dd>	compile in <a href="version.html#version">version identifier</a> <i>ident</i>
	  </dd>
	  <dt><b>-w</b></dt><dd>	enable <a href="warnings.html">warnings</a>
	  </dd>
	  <dt><b>-wi</b></dt><dd>	enable <a href="warnings.html">informational warnings (i.e. compilation
		still proceeds normally)</a>
	  </dd>
	</dl>

    
<h2><a name="linking">Linking</a></h2>

	<p>Linking is done directly by the <b>dmd</b> compiler after a successful
	compile. To prevent <b>dmd</b> from running the linker, use the
	<b>-c</b> switch.
	</p>

    
     <p>The actual linking is done by running <b>gcc</b>.
	This ensures compatibility with modules compiled with <b>gcc</b>.
	</p>
     

<h2><a name="environment">Environment Variables</a></h2>

	<p>The D compiler dmd uses the following environment variables:
	</p>

	<dl>    
    <dt><b>CC</b>
	<dd> <b>dmd</b> normally runs the linker by looking for <b>gcc</b>
	along the <b>PATH</b>. To use a specific linker instead, set the
	<b>CC</b> environment variable to it. For example:

<pre class="console"><span class="notranslate">set CC=gcc
</span></pre>
	<dt><b>BROWSER</b>
	    <dd>This sets the browser used to open the manual page with
	    the <b>-man</b> switch. It defaults to <tt>x-www-browser</tt>.
	    </dd>
	</dt>

	<dt><b>DFLAGS</b>
	<dd>The value of <b>DFLAGS</b> is treated as if it were appended to the
	command line to <b>dmd</b>.
    
	</dl>


<h2><a name="dmd_conf">dmd.conf Initialization File</a></h2>

	<p>The dmd file <tt>dmd.conf</tt> is the same as <tt>sc.ini</tt>
	for Windows, it's just that the file has a different name,
	enabling a setup common to both Windows and this system to be created
	without having to re-edit the file.</p>

	<p><b>dmd</b> will look for the initialization file <tt>dmd.conf</tt> in the
	following sequence of directories:</p>

	<ol><li>current working directory</li>
	<li>directory specified by the <b>HOME</b> environment variable</li>
	<li>directory <b>dmd</b> resides in</li>
	<li><tt>/etc/</tt></li>
	</ol>

	<p>If found, environment variable
	settings in the file will override any existing settings.
	This is handy to make <b>dmd</b> independent of programs with
	conflicting use of environment variables.
	</p>

	<p>Environment variables follow the <tt>[Environment]</tt> section
	heading, in <i>NAME</i>=<i>value</i> pairs.
	The <i>NAME</i>s are treated as upper case.
	Comments are lines that start with ;.
	For example:
	</p>

<pre class="scini"><span class="notranslate">; dmd.conf file for dmd
; Names enclosed by %% are searched for in the existing environment
; and inserted. The special name %@P% is replaced with the path
; to this file.
[Environment]

DFLAGS=-I%@P%/../src/phobos -I%@P%/../src/druntime/import
</span></pre>


<hr>
<h2><a name="differences">Differences between Windows and Linux versions</a></h2>

	<ul>	<li>String literals are read-only under Linux.
	Attempting to write to them
	will cause a segment violation.</li>
	</ul>
<hr>
<h2><a name="interface_files">D Interface Files</a></h2>

	<p>When an import declaration is processed in a D source file,
	the compiler searches for the D source file corresponding to
	the import, and processes that source file to extract the
	information needed from it. Alternatively, the compiler can
	instead look for a corresponding <i>D interface file</i>.
	A D interface file contains only what an import of the module
	needs, rather than the whole implementation of that module.
	</p>

	<p>The advantages of using a D interface file for imports rather
	than a D source file are:
	</p>

	<ul><li>D interface files are often significantly smaller and much
	faster to process than the corresponding D source file.</li>
	<li>They can be used to hide the source code, for example,
	one can ship an object code library along with D interface files
	rather than the complete source code.</li>
	</ul>

	<p>D interface files can be created by the compiler from a
	D source file by using the <b>-H</b> switch to the compiler.
	D interface files have the <b>.di</b> file extension.
	When the compiler resolves an import declaration, it first looks
	for a <b>.di</b> D interface file, then it looks for a D source
	file.
	</p>

	<p>D interface files bear some analogous similarities to C++
	header files. But they are not required in the way that C++
	header files are, and they are not part of the D language.
	They are a feature of the compiler, and serve only as an optimization
	of the build process.
	</p>

<h2><a name="executable">Building Executables</a></h2>

	<p><b>dmd</b> can build an executable much faster if as many of the
	source files as possible are put on the command line.</p>

	<p>Another advantage to putting multiple source files on the same
	invocation of <b>dmd</b> is that <b>dmd</b> will be able to do some level
	of cross-module optimizations, such as function inlining across modules.
	</p>

<h2><a name="library">Building Libraries</a></h2>

	<p>There are three ways to build a library. For example,
	given <tt>foo.d</tt> and <tt>bar.d</tt> which are to be compiled, and existing
	object file <tt>bar.o</tt> and existing library
	<tt>def.a</tt> which are
	all to be combined into a library <tt>foo.a</tt>:</p>

	<ol><li>Compile modules separately and then run the librarian on them:

<pre class="console"><span class="notranslate">dmd -c foo.d
dmd -c bar.d
rm -f foo.a
ar -r foo.a foo.o bar.o abc.o def.a
rm foo.o bar.o
</span></pre>

	This option is typical when using a makefile to avoid compiling
	modules that have already been compiled.
	</li>
	<li>Compile modules together and then run the librarian on them:

<pre class="console"><span class="notranslate">dmd -c foo.d bar.d
rm -f foo.a
ar -r foo.a foo.o bar.o abc.o def.a
rm foo.o bar.o
</span></pre>

	</li>
	<li>Use <b>dmd</b> to compile and build library in one operation:
<pre class="console"><span class="notranslate">dmd -lib foo.d bar.d abc.o def.a
</span></pre>
	No object files are written to disk, it's all done in memory.
	Using <b>-lib</b> also has the advantage that modules may be compiled
	into multiple object files rather than exactly one per module.
	This improves granularity of the library without having to break
	up the modules.
	</li>
	</ol>

<h2><a name="compiling_dmd">Compiling dmd</a></h2>

	<p>Complete source code is provided to build the compiler.
	Follow these steps:</p>


<pre class="console"><span class="notranslate">cd ~/dmd2/src/dmd
make -f freebsd.mak
</span></pre>


<h2><a name="compiling_phobos">Compiling Phobos</a></h2>

	<p>Complete source code is provided to build Phobos, the D runtime library.
	Follow these steps:</p>


<pre class="console"><span class="notranslate">cd ~/dmd2/src/druntime
make -f posix.mak DMD=~/dmd2/freebsd/bin/dmd
cd ../phobos
make -f freebsd.mak DMD=~/dmd2/freebsd/bin/dmd
</span></pre>


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