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<!--*********************************************************************-->
                     <h1>Testing libc++ using LIT</h1>
<!--*********************************************************************-->
<p>
libc++ uses LIT to configure and run its tests. The primary way to run the
libc++ tests is by using <code>make check-libcxx</code>. However since libc++
can be used in any number of possible configurations it is important to
customize the way LIT builds and runs the tests. This guide provides
information on how to use LIT directly to test libc++.
</p>
<p>
Documentation for LIT can be found
<a href="http://llvm.org/docs/CommandGuide/lit.html">here</a>.
</p>

<!--*********************************************************************-->
                        <h2>Getting Started</h2>
<!--*********************************************************************-->
<p>
After building libc++ use the following commands before you start using LIT to
test.
</p>
<ul>
  <li><code>alias lit='python path/to/llvm/utils/lit/lit.py'</code></li>
  <li><code>export LIBCXX_SITE_CONFIG=path/to/build-libcxx/test/lit.site.cfg</code></li>
</ul>
<p>
You can now run the libc++ tests by running:
</p>
<ul>
  <li><code>cd path/to/libcxx</code></li>
  <li><code>lit -sv ./test</code></li>
</ul>
<p>
To only run a subsection of the tests use:
<ul>
  <li><code>lit -sv test/std/numerics # Run only the numeric tests</code></li>
</ul>

<!--*********************************************************************-->
                     <h2>Customization Options</h2>
<!--*********************************************************************-->
<p>
libc++'s testsuite provides multiple options to configure the way the tests
are build and run. To use these options you pass them on the LIT command line
as <code>--param NAME</code> or <code>--param NAME=VALUE</code>. Some options
have default values specified during CMake's configuration. Passing the option
on the command line will override the default.
</p>


<p>
<h3 class="lit-option">libcxx_site_config=&lt;path/to/lit.site.cfg&gt;</h3>
<blockquote class="lit-option-desc">
Specify the site configuration to use when running the tests. This option
overrides the enviroment variable <code>LIBCXX_SITE_CONFIG</code>
</blockquote>
</p>

<p>
<h3 class="lit-option">libcxx_headers=&lt;path/to/headers&gt;</h3>
<blockquote class="lit-option-desc">
Specify the libc++ headers that are tested. By default the headers in the source
tree are used.
</blockquote>
</p>

<p>
<h3 class="lit-option">libcxx_library=&lt;path/to/libc++.so&gt;</h3>
<blockquote class="lit-option-desc">
Specify the libc++ library that is tested. By default the library in the build
directory is used. This option cannot be used when <code>use_system_lib</code>
is provided.
</blockquote>
</p>

<p>
<h3 class="lit-option">use_system_lib=&lt;bool&gt;</h3>
<blockquote class="lit-option-desc">
<b>Default: </b><code>False</code></br>
Enable or disable testing against the installed version of libc++ library.
Note: This does not use the installed headers.
</blockquote>
</p>

<p>
<h3 class="lit-option">use_lit_shell=&lt;bool&gt;</h3>
<blockquote class="lit-option-desc">
Enable or disable the use of LIT's internal shell in ShTests. If the enviroment
variable <code>LIT_USE_INTERNAL_SHELL</code> is present then that is used as the
default value. Otherwise the default value is <code>True</code> on Windows and
<code>False</code> on every other platform.
</blockquote>
</p>

<p>
<h3 class="lit-option">no_default_flags=&lt;bool&gt;</h3>
<blockquote class="lit-option-desc">
<b>Default: </b><code>False</code></br>
Disable all default compile and link flags from being added. When this option is
used only flags specified using the <code>compile_flags</code> and
<code>link_flags</code> will be used.
</blockquote>
</p>

<p>
<h3 class="lit-option">compile_flags="&lt;list-of-args&gt;"</h3>
<blockquote class="lit-option-desc">
Specify additional compile flags as a space delimited string.
Note: This options should not be used to change the standard version used.
</blockquote>
</p>

<p>
<h3 class="lit-option">link_flags="&lt;list-of-args&gt;"</h3>
<blockquote class="lit-option-desc">
Specify additional link  flags as a space delimited string.
</blockquote>
</p>

<p>
<h3 class="lit-option">std=&lt;standard version&gt;</h3>
<blockquote class="lit-option-desc">
<b>Values: </b><code>c++98, c++03, c++11, c++14, c++1z</code></br>
Change the standard version used when building the tests.
</blockquote>
</p>

<p>
<h3 class="lit-option">debug_level=&lt;level&gt;</h3>
<blockquote class="lit-option-desc">
<b>Values: </b><code>0, 1</code></br>
Enable the use of debug mode. Level 0 enables assertions and level 1 enables
assertions and debugging of iterator misuse.
</blockquote>
</p>

<p>
<h3 class="lit-option">use_sanitizer=&lt;sanitizer name&gt;</h3>
<blockquote class="lit-option-desc">
<b>Values: </b><code>Memory, MemoryWithOrigins, Address, Undefined</code></br>
Run the tests using the given sanitizer. If <code>LLVM_USE_SANITIZER</code>
was given when building libc++ then that sanitizer will be used by default.
</blockquote>
</p>

<p>
<h3 class="lit-option">color_diagnostics</h3>
<blockquote class="lit-option-desc">
Enable the use of colorized compile diagnostics. If the
<code>color_diagnostics</code> option is specified or the enviroment variable
<code>LIBCXX_COLOR_DIAGNOSTICS</code> is present then color diagnostics will be
enabled.
</blockquote>
</p>

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