[REVISED PATCH 7/9]: C++ P0482R5 char8_t: New standard library tests

[Jonathan Wakely]

On 23/12/18 21:27 -0500, Tom Honermann wrote:
>Attached is a revised patch that addresses changes in P0482R6.  
>Changes from the prior patch include:
>- Updated the value of the __cpp_char8_t feature test macro to 201811.
>
>Tested on x86_64-linux.

There are quite a few additional changes needed to make the testsuite
pass cleanly with non-default options, e.g. when running it with
RUNTESTFLAGS=--target_board=unix/-fchar8_t/-fno-inline I see these
failures:

FAIL: 21_strings/basic_string/literals/types.cc (test for excess errors)
FAIL: 21_strings/basic_string/literals/values.cc (test for excess errors)
UNRESOLVED: 21_strings/basic_string/literals/values.cc compilation failed to produce executable
FAIL: 21_strings/basic_string_view/literals/types.cc (test for excess errors)
FAIL: 21_strings/basic_string_view/literals/values.cc (test for excess errors)
UNRESOLVED: 21_strings/basic_string_view/literals/values.cc compilation failed to produce executable
FAIL: 22_locale/codecvt/char16_t.cc (test for excess errors)
UNRESOLVED: 22_locale/codecvt/char16_t.cc compilation failed to produce executable
FAIL: 22_locale/codecvt/char32_t.cc (test for excess errors)
UNRESOLVED: 22_locale/codecvt/char32_t.cc compilation failed to produce executable
FAIL: 22_locale/codecvt/codecvt_utf8/79980.cc (test for excess errors)
UNRESOLVED: 22_locale/codecvt/codecvt_utf8/79980.cc compilation failed to produce executable
FAIL: 22_locale/codecvt/codecvt_utf8/wchar_t/1.cc (test for excess errors)
UNRESOLVED: 22_locale/codecvt/codecvt_utf8/wchar_t/1.cc compilation failed to produce executable
FAIL: 22_locale/codecvt/utf8.cc (test for excess errors)
UNRESOLVED: 22_locale/codecvt/utf8.cc compilation failed to produce executable
FAIL: 22_locale/conversions/string/2.cc (test for excess errors)
UNRESOLVED: 22_locale/conversions/string/2.cc compilation failed to produce executable
FAIL: 22_locale/conversions/string/3.cc (test for excess errors)
UNRESOLVED: 22_locale/conversions/string/3.cc compilation failed to produce executable
FAIL: experimental/string_view/literals/types.cc (test for excess errors)
FAIL: experimental/string_view/literals/values.cc (test for excess errors)
UNRESOLVED: experimental/string_view/literals/values.cc compilation failed to produce executable

There would be similar errors running all the tests with -std=c++2a,
which is definitely something I do often and so want the tests to be
clean. We can either disable those tests when char8_t is enabled
(because we already have alternative tests checking the char8_t
versions of string_view etc.) or make them work either way, which the
attached patch begins doing (more changes are needed).

I expect a different set of failures for -fno-char8_t (which is
probably a less important case to support that enabling char8_t in
older standards, but maybe still worth testing now and then).

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