Add support for response files to the CommandLine library.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50355 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 31 insertions, 4 deletions

diff --git a/docs/CommandLine.html b/docs/CommandLine.html
index 91f4b1535e..93b5ca1c69 100644
--- a/docs/CommandLine.html
+++ b/docs/CommandLine.html
@@ -52,6 +52,7 @@
                                    specified</a></li>
         <li><a href="#formatting">Controlling other formatting options</a></li>
         <li><a href="#misc">Miscellaneous option modifiers</a></li>
+        <li><a href="#response">Response files</a></li>
         </ul></li>
 
       <li><a href="#toplevel">Top-Level Classes and Functions</a>
@@ -1442,6 +1443,29 @@ only makes sense with a <a href="#cl::list">cl::list</a> option.</li>
 
 </div>
 
+<!-- _______________________________________________________________________ -->
+<div class="doc_subsubsection">
+  <a name="response">Response files</a>
+</div>
+
+<div class="doc_text">
+
+<p>Some systems, such as certain variants of Microsoft Windows and
+some older Unices have a relatively low limit on command-line
+length. It is therefore customary to use the so-called 'response
+files' to circumvent this restriction. These files are mentioned on
+the command-line (using the "@file") syntax. The program reads these
+files and inserts the contents into argv, thereby working around the
+command-line length limits. Response files are enabled by an optional
+fourth argument to
+<a href="#cl::ParseEnvironmentOptions"><tt>cl::ParseEnvironmentOptions</tt></a>
+and
+<a href="#cl::ParseCommandLineOptions"><tt>cl::ParseCommandLineOptions</tt></a>.
+</p>
+
+</div>
+
+
 <!-- ======================================================================= -->
 <div class="doc_subsection">
   <a name="toplevel">Top-Level Classes and Functions</a>
@@ -1475,7 +1499,8 @@ available.</p>
 <p>The <tt>cl::ParseCommandLineOptions</tt> function requires two parameters
 (<tt>argc</tt> and <tt>argv</tt>), but may also take an optional third parameter
 which holds <a href="#description">additional extra text</a> to emit when the
-<tt>--help</tt> option is invoked.</p>
+<tt>--help</tt> option is invoked, and a fourth boolean parameter that enables
+<a href="#response">response files</a>.</p>
 
 </div>
 
@@ -1497,11 +1522,13 @@ like <a
 href="#cl::ParseCommandLineOptions"><tt>cl::ParseCommandLineOptions</tt></a>
 does.</p>
 
-<p>It takes three parameters: the name of the program (since <tt>argv</tt> may
+<p>It takes four parameters: the name of the program (since <tt>argv</tt> may
 not be available, it can't just look in <tt>argv[0]</tt>), the name of the
-environment variable to examine, and the optional
+environment variable to examine, the optional
 <a href="#description">additional extra text</a> to emit when the
-<tt>--help</tt> option is invoked.</p>
+<tt>--help</tt> option is invoked, and the boolean
+switch that controls whether <a href="#response">reponse files</a>
+should be read.</p>
 
 <p><tt>cl::ParseEnvironmentOptions</tt> will break the environment
 variable's value up into words and then process them using