clarify that clang version number macros are marketing version #'s, not something useful.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146672 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index 79b96f6..f8c0d4f 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -357,20 +357,25 @@
<dd>Defined when compiling with Clang</dd>
<dt><code>__clang_major__</code></dt>
- <dd>Defined to the major version number of Clang (e.g., the 2 in
- 2.0.1).</dd>
+ <dd>Defined to the major marketing version number of Clang (e.g., the
+ 2 in 2.0.1). Note that marketing version numbers should not be used to
+ check for language features, as different vendors use different numbering
+ schemes. Instead, use the <a href="#feature_check">feature checking
+ macros</a>.</dd>
<dt><code>__clang_minor__</code></dt>
<dd>Defined to the minor version number of Clang (e.g., the 0 in
- 2.0.1).</dd>
+ 2.0.1). Note that marketing version numbers should not be used to
+ check for language features, as different vendors use different numbering
+ schemes. Instead, use the <a href="#feature_check">feature checking
+ macros</a>.</dd>
<dt><code>__clang_patchlevel__</code></dt>
- <dd>Defined to the patch level of Clang (e.g., the 1 in 2.0.1).</dd>
+ <dd>Defined to the marketing patch level of Clang (e.g., the 1 in 2.0.1).</dd>
<dt><code>__clang_version__</code></dt>
- <dd>Defined to a string that captures the Clang version, including
- the Subversion tag or revision number, e.g., "1.5 (trunk
- 102332)".</dd>
+ <dd>Defined to a string that captures the Clang marketing version, including
+ the Subversion tag or revision number, e.g., "1.5 (trunk 102332)".</dd>
</dl>
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