[PATCH] D23241: Add the notion of deferred diagnostics.

[Justin Lebar via cfe-commits]

jlebar created this revision.
jlebar added a reviewer: rnk.
jlebar added subscribers: tra, cfe-commits.

This patch lets you create diagnostics that are emitted if and only if a
particular FunctionDecl is codegen'ed.

This is necessary for CUDA, where some constructs -- e.g. calls from
host+device functions to host functions when compiling for device -- are
allowed to appear in semantically-correct programs, but only if they're
never codegen'ed.

https://reviews.llvm.org/D23241

Files:
  clang/include/clang/AST/Decl.h
  clang/lib/AST/Decl.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/CodeGen/CodeGenModule.h

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