objc_storeStrong does not return a value.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@294855 91177308-0d34-0410-b5e6-96231b3b80d8

Fixed incorrect docs that referred to:
  objc_arc_weak_unavailable
when it should be:
  objc_arc_weak_reference_unavailable

Patch by: Sean McBride!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@281227 91177308-0d34-0410-b5e6-96231b3b80d8

Previously we allowed these casts only for constants declared in system
headers, which we assume are retain/release-neutral. Now also allow them
for constants in user headers, treating them as +0.  Practically, this
means that we will now allow:
id x = (id)kMyGlobalConst;

But unlike with system headers we cannot mix them with +1 values:
id y = (id)(b ? kMyGlobalConst : [Obj newValAtPlusOne]); // error
id z = (id)(b ? kSystemGlobalConst: [Obj newValAtPlusOne]); // OK

Thanks to John for suggesting this improvement.

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the requirements on the ARC optimizer.

rdar://13407451

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176924 91177308-0d34-0410-b5e6-96231b3b80d8

of block declarators.  Document the rule we use.

Also document the rule that Doug implemented a few weeks ago
which drops ownership qualifiers on function result types.

rdar://10127067

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@176336 91177308-0d34-0410-b5e6-96231b3b80d8

that a __strong object of block type is a valid argument to objc_storeStrong but
that an objc_retain and not an objc_retainBlock will be emitted.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175838 91177308-0d34-0410-b5e6-96231b3b80d8

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171920 91177308-0d34-0410-b5e6-96231b3b80d8

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170296 91177308-0d34-0410-b5e6-96231b3b80d8

This enables us to use the same document structure as in other files.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170283 91177308-0d34-0410-b5e6-96231b3b80d8

The adornment:

===
Foo
===

is for titles, not sections.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170278 91177308-0d34-0410-b5e6-96231b3b80d8

Patch by Anastasi Voitova with with small fixes by me.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@170132 91177308-0d34-0410-b5e6-96231b3b80d8