Author: kremenek
Date: Wed Dec 2 20:04:01 2009
New Revision: 90388
URL: http://llvm.org/viewvc/llvm-project?rev=90388&view=rev
Log:
Add section on what language features __has_feature() supports for querying if
they are enabled.
Modified:
cfe/trunk/docs/LanguageExtensions.html
Modified: cfe/trunk/docs/LanguageExtensions.html
URL:
http://llvm.org/viewvc/llvm-project/cfe/trunk/docs/LanguageExtensions.html?rev=90388&r1=90387&r2=90388&view=diff
==============================================================================
--- cfe/trunk/docs/LanguageExtensions.html (original)
+++ cfe/trunk/docs/LanguageExtensions.html Wed Dec 2 20:04:01 2009
@@ -23,6 +23,7 @@
<li><a href="#has_include">Include File Checking Macros</a></li>
<li><a href="#builtinmacros">Builtin Macros</a></li>
<li><a href="#vectors">Vectors and Extended Vectors</a></li>
+<li><a href="#checking_language_features">Checks for Standard Language
Features</a></li>
<li><a href="#blocks">Blocks</a></li>
<li><a href="#overloading-in-c">Function Overloading in C</a></li>
<li><a href="#builtins">Builtin Functions</a>
@@ -194,6 +195,23 @@
<p>Query for this feature with __has_feature(attribute_ext_vector_type).</p>
<!-- =======================================================================
-->
+<h2 id="checking_language_features">Checks for Standard Language Features</h2>
+<!-- =======================================================================
-->
+
+<p>The <tt>__has_feature</tt> macro can be used to query if certain standard
language features are
+enabled. Those features are listed here.</p>
+
+<h3>C++ exceptions</h3>
+
+Use <tt>__has_feature(cxx_exceptions)</tt> to determine if C++ exceptions have
been enabled. For
+example, compiling code with <tt>-fexceptions</tt> enables C++ exceptions.
+
+<h3>C++ RTTI</h3>
+
+Use <tt>__has_feature(cxx_rtt)</tt> to determine if C++ RTTI has been enabled.
For example,
+compiling code with <tt>-fno-rtti</tt> disables the use of RTTI.
+
+<!-- =======================================================================
-->
<h2 id="blocks">Blocks</h2>
<!-- =======================================================================
-->
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