Re: [PATCH] 21_strings/basic_string/capacity/wchar_t/18654.cc

[David Edelsohn <dje.gcc@gmail.com>]

On Fri, Nov 13, 2015 at 1:40 PM, David Edelsohn <dje.gcc@gmail.com> wrote:
> http://www.cplusplus.com/reference/string/basic_string/reserve/
>
> "Note that the resulting string capacity may be equal or greater than n."
>
> The current testcase verifies that the capacity is exactly equal to
> the length of the string or reserve value, but the standard allows the
> capacity to be larger.  On AIX, the capacity is larger and the
> testcase incorrectly fails.
>
> Linux x86-64:
> i: 4
> str.length: 4
> str.capacity: 4
> str.capacity: 12
> str.capacity: 8
> str.capacity: 4
>
> AIX:
> i: 4
> str.length: 4
> str.capacity: 7   <-- i
> str.capacity: 14  <-- i*3
> str.capacity: 8   <-- i*2
> str.capacity: 7   <-- default
>
> * 21_strings/basic_string/capacity/wchar_t/18654.cc: Verify the

Jonathan,

AIX has 2-byte wchar_t in 32 bit mode, which seems to be the cause of
all of the libstdc++ testsuite wchar_t failures.  If GCC libstdc++ is
suppose to shrink-to-fit, how should the testcases be fixed?

Thanks, David