[PATCH] don't treat as zero empty string initializers of pointer array elements (PR 89980)

Jason Merrill jason@redhat.com
Fri Apr 5 19:33:00 GMT 2019

On 4/5/19 2:25 PM, Martin Sebor wrote:
> On 4/5/19 10:45 AM, Martin Sebor wrote:
>> The change committed yesterday to handle the C++ 2a string literals
>> as non-type template arguments treats empty string initializers for
>> trailing pointer array elements as zero.  That's of course wrong
>> because addresses of literals are non-zero.
>> The attached tweak constrains the trimming of trailing zero
>> initializers to either non-pointer initializers or non-pointer
>> types.
>> The patch passes x86_64 bootstrap (but so did the change yesterday).
>> The tests are still running.  Is it okay to commit if the tests pass?
>> I'm also separately bootstrapping using the configure options from
>> the report where apparently it caused the x86_64 bootstrap to fail.
> This bootstrap also passed.
> Attached is a slightly updated patch that, besides fixing this
> bug, also reverts the use of TYPE_HAS_TRIVIAL_DFLT() in favor
> of trivial_type_p().  Using the macro turned out not to be
> quite right -- it caused cpp0x/constexpr-63241.C to be rejected.
> I missed that among all the other test failures.
> I'm still not sure what happened with my yesterday's build that
> it doesn't show the bootstrap failure.



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