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# 6f4f0f18 20-Oct-2017 Richard Smith <[email protected]>

Implement current CWG direction for support of arrays of unknown bounds in
constant expressions.

We permit array-to-pointer decay on such arrays, but disallow pointer
arithmetic (since we do not kno

Implement current CWG direction for support of arrays of unknown bounds in
constant expressions.

We permit array-to-pointer decay on such arrays, but disallow pointer
arithmetic (since we do not know whether it will have defined behavior).

This is based on r311970 and r301822 (the former by me and the latter by Robert
Haberlach). Between then and now, two things have changed: we have committee
feedback indicating that this is indeed the right direction, and the code
broken by this change has been fixed.

This is necessary in C++17 to continue accepting certain forms of non-type
template argument involving arrays of unknown bound.

llvm-svn: 316245

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Revision tags: llvmorg-5.0.0, llvmorg-5.0.0-rc5, llvmorg-5.0.0-rc4, llvmorg-5.0.0-rc3, llvmorg-5.0.0-rc2, llvmorg-5.0.0-rc1, llvmorg-4.0.1, llvmorg-4.0.1-rc3, llvmorg-4.0.1-rc2
# eec904f8 01-May-2017 Richard Smith <[email protected]>

Improve handling of arrays of unknown bound in constant expressions.

Do not spuriously reject constexpr functions that access elements of an array
of unknown bound; this may later become valid once

Improve handling of arrays of unknown bound in constant expressions.

Do not spuriously reject constexpr functions that access elements of an array
of unknown bound; this may later become valid once the bound is known. Permit
array-to-pointer decay on such arrays, but disallow pointer arithmetic (since
we do not know whether it will have defined behavior).

The standard is not clear on how this should work, but this seems to be a
decent answer.

Patch by Robert Haberlach!

llvm-svn: 301822

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