Add dependencies Makefile generation to erlc(1) and compile(3)

This is useful when a project is built with Makefiles and erlc(1)
instead of EMakefiles. Tracking dependencies by hand is error-prone and
it becomes painful when using external application headers like EUnit's
one.

A dependencies Makefile will look like this:

    module.beam: module.erl \
      /usr/local/lib/erlang/lib/eunit-2.1.4/include/eunit.hrl \
      header.hrl

When included in the main Makefile, 'module' will be recompiled only
when needed.

GCC offers the same feature and new erlc(1) options are compatible with
it.

More informations at:
    http://wiki.github.com/dumbbell/otp/dependencies-makefile

1 files changed, 64 insertions, 0 deletions

diff --git a/lib/compiler/doc/src/compile.xml b/lib/compiler/doc/src/compile.xml
index c3d65b4cb5..77f3e9b0be 100644
--- a/lib/compiler/doc/src/compile.xml
+++ b/lib/compiler/doc/src/compile.xml
@@ -164,6 +164,70 @@
               for details.</p>
           </item>
 
+          <tag><c>makedep</c></tag>
+          <item>
+            <p>Produce a Makefile rule to track headers dependencies.
+              No object file is produced.
+            </p>
+            <p>By default, this rule is written to
+              <c><![CDATA[<File>.Pbeam]]></c>. However, if the option
+                <c>binary</c> is set, nothing is written and the rule is
+                returned in <c>Binary</c>.
+            </p>
+            <p>For instance, if one has the following module:
+            </p>
+            <code>
+-module(module).
+
+-include_lib("eunit/include/eunit.hrl").
+-include("header.hrl").
+            </code>
+            <p>Here is the Makefile rule generated by this option:
+            </p>
+            <code>
+module.beam: module.erl \
+  /usr/local/lib/erlang/lib/eunit/include/eunit.hrl \
+  header.hrl
+            </code>
+          </item>
+
+          <tag><c>{makedep_output, Output}</c></tag>
+          <item>
+            <p>Write generated rule(s) to <c>Output</c> instead of the
+              default <c><![CDATA[<File>.Pbeam]]></c>. <c>Output</c>
+              can be a filename or an <c>io_device()</c>. To write to
+              stdout, use <c>standard_io</c>. However if <c>binary</c>
+              is set, nothing is written to <c>Output</c> and the
+              result is returned to the caller with
+              <c>{ok, ModuleName, Binary}</c>.
+            </p>
+          </item>
+
+          <tag><c>{makedep_target, Target}</c></tag>
+          <item>
+            <p>Change the name of the rule emitted to <c>Target</c>.
+            </p>
+          </item>
+
+          <tag><c>makedep_quote_target</c></tag>
+          <item>
+            <p>Characters in <c>Target</c> special to make(1) are quoted.
+            </p>
+          </item>
+
+          <tag><c>makedep_add_missing</c></tag>
+          <item>
+            <p>Consider missing headers as generated files and add them to the
+              dependencies.
+            </p>
+          </item>
+
+          <tag><c>makedep_phony</c></tag>
+          <item>
+            <p>Add a phony target for each dependency.
+            </p>
+          </item>
+
           <tag><c>'P'</c></tag>
           <item>
             <p>Produces a listing of the parsed code after preprocessing