[OpenCL] Improve diagnostic for placement new

Without an explicit declaration for placement new, clang would reject
uses of placement new with "'default new' is not supported in OpenCL
C++".  This may mislead users into thinking that placement new is not
supported, see e.g. PR42060.

Clarify that placement new requires an explicit declaration.

Differential Revision: https://reviews.llvm.org/D63561

llvm-svn: 364423
3 files changed
tree: 2aa6987081b2d36771ad5c7839dabf0ddfdb231f
  1. .arcconfig
  2. .clang-format
  3. .clang-tidy
  4. .github/
  5. .gitignore
  6. README.md
  7. clang-tools-extra/
  8. clang/
  9. compiler-rt/
  10. debuginfo-tests/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llgo/
  18. llvm/
  19. openmp/
  20. parallel-libs/
  21. polly/
  22. pstl/
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.