[LLVMbugs] [Bug 20756] Create a helper pragma to make unity builds easire

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20756

Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |rnk at google.com
         Resolution|---                         |WONTFIX

--- Comment #1 from Reid Kleckner <rnk at google.com> ---
I don't think we currently have any interest in supporting this. Unity builds
are a hack around crappy compiler technology, and we'd rather fix the core
algorithms rather than promote the hack. Most of our efforts are pointed at
modules, which also avoid reparsing headers and are much more scalable than
unity builds.

I don't think this is impossible to implement in Clang. Hypothetically you
could start the TU with your pragma. If we see the pragma, we would start
tracking TU-local entities such as using decls, anonymous namespaces, statics,
etc, and then somehow delete them from the AST after iterating to fixpoint in
CodeGen. Unless someone steps forward with the resources to implement this,
though, I think we should mark this as wontfix.

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