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Document that dllexported symbols are preserved by optimization passes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196523 91177308-0d34-0410-b5e6-96231b3b80d8
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Yunzhong Gao 2013-12-05 18:37:54 +00:00
parent 3bb1184a1a
commit 9477d57763
1 changed files with 5 additions and 3 deletions
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docs/LangRef.rst
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@ -289,7 +289,9 @@ symbols from (to) DLLs (Dynamic Link Libraries).
pointer to a pointer in a DLL, so that it can be referenced with the
``dllimport`` attribute. On Microsoft Windows targets, the pointer
name is formed by combining ``__imp_`` and the function or variable
name.
name. Since this linkage exists for defining a dll interface, the
compiler, assembler and linker know it is externally referenced and
must refrain from deleting the symbol.
It is illegal for a function *declaration* to have any linkage type
other than ``external``, ``dllimport`` or ``extern_weak``.
@ -501,8 +503,8 @@ variables defined within the module are not modified from their
initial values before the start of the global initializer. This is
true even for variables potentially accessible from outside the
module, including those with external linkage or appearing in
``@llvm.used``. This assumption may be suppressed by marking the
variable with ``externally_initialized``.
``@llvm.used`` or dllexported variables. This assumption may be suppressed
by marking the variable with ``externally_initialized``.
An explicit alignment may be specified for a global, which must be a
power of 2. If not present, or if the alignment is set to zero, the