which versions of an OS provide a certain facility. For example,

  void foo()
  __attribute__((availability(macosx,introduced=10.2,deprecated=10.4,obsoleted=10.6)));

says that the function "foo" was introduced in 10.2, deprecated in
10.4, and completely obsoleted in 10.6. This attribute ties in with
the deployment targets (e.g., -mmacosx-version-min=10.1 specifies that
we want to deploy back to Mac OS X 10.1). There are several concrete
behaviors that this attribute enables, as illustrated with the
function foo() above:

  - If we choose a deployment target >= Mac OS X 10.4, uses of "foo"
    will result in a deprecation warning, as if we had placed
    attribute((deprecated)) on it (but with a better diagnostic)
  - If we choose a deployment target >= Mac OS X 10.6, uses of "foo"
    will result in an "unavailable" warning (in C)/error (in C++), as
    if we had placed attribute((unavailable)) on it
  - If we choose a deployment target prior to 10.2, foo() is
    weak-imported (if it is a kind of entity that can be weak
    imported), as if we had placed the weak_import attribute on it.

Naturally, there can be multiple availability attributes on a
declaration, for different platforms; only the current platform
matters when checking availability attributes.

The only platforms this attribute currently works for are "ios" and
"macosx", since we already have -mxxxx-version-min flags for them and we
have experience there with macro tricks translating down to the
deprecated/unavailable/weak_import attributes. The end goal is to open
this up to other platforms, and even extension to other "platforms"
that are really libraries (say, through a #pragma clang
define_system), but that hasn't yet been designed and we may want to
shake out more issues with this narrower problem first.

Addresses <rdar://problem/6690412>.

As a drive-by bug-fix, if an entity is both deprecated and
unavailable, we only emit the "unavailable" diagnostic.

llvm-svn: 128127

CharUnits. No change in functionality intended.

llvm-svn: 128126

on previous block parameters that crept in as part of my captures
work a month or so ago.

llvm-svn: 128121

llvm-svn: 128118

both 32-bit and 64-bit targets.

llvm-svn: 128110

Simplify Mac runtime selection - it's the factory function's job to select which class to produce, not CodeGenModule's.

llvm-svn: 128109

llvm-svn: 128105

Make the property accessor functions that take a ptrdiff_t actually take a ptrdiff_t instead of a long (should have no impact on any sane platforms, but win64 is not sane).

llvm-svn: 128104

Make the ivar offset always be a ptrdiff_t, because stuff in CGObjC.cpp expects this.  Actually, it expects a long, but that's a bug that will be fixed in the next commit...

llvm-svn: 128102

llvm-svn: 128088

line options, instead of leveraging the blanket -mllvm option.
 - This allows using the frontend itself without requiring the backend have
   those options available (i.e., if the target wasn't built).

llvm-svn: 128087

And clearing a SmallPtrSet can be an expensive operation.

llvm-svn: 128081

llvm-svn: 128075

conditioned on whether it has any destructible ivars, not on whether
it has any non-trivial class-object initializers.

llvm-svn: 128074

a function template decl's pattern, which was suddenly exposed by my
last patch.

llvm-svn: 128073

they don't collide with file-scope extern functions from the same
translation unit.  This is basically a matter of applying the same
logic to FunctionDecls as we were previously applying to VarDecls.

llvm-svn: 128072

CharUnits. No change in functionality intended.

llvm-svn: 128060

Rework crash recovery cleanup in ASTUnit and CIndex to recover more memory during a Sema crash (we have just a handful of leaks left)
and to use the simplified cleanup registration API.

llvm-svn: 128059

Remove crash recovery cleanups from TypeLocBuilder.  They were a bit error prone, only hit in rare cases.

llvm-svn: 128058

llvm-svn: 128057

Migrate 'PrettySTackTraceParserEntry' object out of Parser, and have it constructed within ParseAST.  This avoids double crashes
during crash recovery.

llvm-svn: 128056

change in functionality intended.

llvm-svn: 128050

to CharUnits. No change in functionality intended.

llvm-svn: 128047

llvm-svn: 128043

llvm-svn: 128029

llvm-svn: 128018

llvm-svn: 128015

really make any sense in this environment.

llvm-svn: 128014

// rdar:// 9139947

llvm-svn: 128013

Improve crash recovery cleanup to recovery CompilerInstances during crash recovery.  This was a huge resource "root" during crashes.

This change requires making a bunch of fundamental Clang structures (optionally) reference counted to allow correct
ownership semantics of these objects (e.g., ASTContext) to play out between an active ASTUnit and CompilerInstance
object.

llvm-svn: 128011

llvm-svn: 128010

llvm-svn: 128009

llvm-svn: 128001

program and fallback to plain version otherwise. Use this for the NetBSD
target to make it try e.g. i486--netbsdelf-as and -ld for target
i486--netbsdelf.

llvm-svn: 127996

Drop program paths on NetBSD (unused). Only include lib dir, if
-nostdlib is absent. Use = to allow --sysroot to work.

llvm-svn: 127995

and DragonFly. Use the --sysroot= form for Linux. Fix handling of =
prefix for -B.

llvm-svn: 127994

llvm-svn: 127987

a year now.  Update the internals manual.

llvm-svn: 127983

llvm-svn: 127980

llvm-svn: 127977