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clarify linkonce/weak linkage

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33201 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2007-01-14 06:51:48 +00:00
parent 70d4107a45
commit 4887bd8f8e
1 changed files with 10 additions and 7 deletions
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@ -424,23 +424,26 @@ All Global Variables and Functions have one of the following types of linkage:
an internal global value may cause the internal to be renamed as necessary to
avoid collisions. Because the symbol is internal to the module, all
references can be updated. This corresponds to the notion of the
'<tt>static</tt>' keyword in C, or the idea of "anonymous namespaces" in C++.
'<tt>static</tt>' keyword in C.
</dd>
<dt><tt><b><a name="linkage_linkonce">linkonce</a></b></tt>: </dt>
<dd>"<tt>linkonce</tt>" linkage is similar to <tt>internal</tt> linkage, with
the twist that linking together two modules defining the same
<tt>linkonce</tt> globals will cause one of the globals to be discarded. This
is typically used to implement inline functions. Unreferenced
<tt>linkonce</tt> globals are allowed to be discarded.
<dd>Globals with "<tt>linkonce</tt>" linkage are merged with other globals of
the same name when linkage occurs. This is typically used to implement
inline functions, templates, or other code which must be generated in each
translation unit that uses it. Unreferenced <tt>linkonce</tt> globals are
allowed to be discarded.
</dd>
<dt><tt><b><a name="linkage_weak">weak</a></b></tt>: </dt>
<dd>"<tt>weak</tt>" linkage is exactly the same as <tt>linkonce</tt> linkage,
except that unreferenced <tt>weak</tt> globals may not be discarded. This is
used to implement constructs in C such as "<tt>int X;</tt>" at global scope.
used for globals that may be emitted in multiple translation units, but that
are not guaranteed to be emitted into every translation unit that uses them.
One example of this are common globals in C, such as "<tt>int X;</tt>" at
global scope.
</dd>
<dt><tt><b><a name="linkage_appending">appending</a></b></tt>: </dt>