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tests/usr.bin/*: Mark profiling tests xfail on riscv.

PR port-riscv/59301: riscv: missing MKPROFILE=yes support

Put the sprinkled -static in the right place, i.e. fix up previous.

Thanks to rillig for spotting my mistake.

Sprinkle "-static" when using "-pg" as profiling only works with static and
the gcc specs are currently broken.

PR/56876: hppa: "cc -pg" fails with "undefined reference to `mprotect'"

Now, profiling works for GCC9 on aarch64{,eb}.

Note that it seems to work even for GCC8, according to log data of
official test runs, e.g.,

	https://releng.netbsd.org/b5reports/evbarm-aarch64/2020/2020.09.01.15.45.20/test.log

Merge changes from current as of 20200406

Mark compilation with -pg as xfail on aarch64.

XXX file a PR to xref

Sync with HEAD

Synch with HEAD

This now works too.

Resolve conflicts between branch and HEAD

file t_pthread_once.sh was added on branch pgoyette-compat on 2018-03-30 06:20:16 +0000

Add new C++ ATF tests

Add new variations for existing C++ tests:
 - Static
 - Profile+32-bit
 - PIC+32-bit
 - PIC+Profile
 - PIC+Profile+32-bit

All tests pass for NetBSD/amd64:
 - t_cxxruntime
 - t_hello
 - t_static_destructor

+--------------------------------------------------------------+
| Options            | cxxruntime | hello  | static_destructor |
+--------------------------------------------------------------+
| None               | Passed     | Passed | Passed            |
| 32-bit             | Passed     | Passed | Passed            |
| PIC                | Passed     | Passed | Passed            |
| PIE                | Passed     | Passed | Passed            |
| Profile            | Passed     | Passed | Passed            |
| Static             | Passed     | Passed | Passed            |
| Profile+32-bit     | Passed     | Passed | Passed            |
| PIC+32-bit         | Passed     | Passed | Passed            |
| PIC+Profile        | Passed     | Passed | Passed            |
| PIC+Profile+32-bit | Passed     | Passed | Passed            |
+--------------------------------------------------------------+

Add new C++11 std::call_once tests:
 - t_call_once
 - t_call_once2

Add new C++11 test with pthread_once(3) and C++ lambda:
 - t_pthread_once

All tests with the profile option for std::call_once and
pthread_once(3) are marked as expected failure (NetBSD/amd64).

Results for *_once*:
+------------------------------------------------------------+
| Options            | call_once | call_once2 | pthread_once |
+------------------------------------------------------------+
| None               | Passed    | Passed     | Passed       |
| 32-bit             | Passed    |  Passed    | Passed       |
| PIC                | Passed    | Passed     | Passed       |
| PIE                | Passed    | Passed     | Passed       |
| Profile            |  Failed   |  Failed    |  Failed      |
| Static             | Passed    | Passed     | Passed       |
| Profile+32-bit     |  Failed   |  Failed    |  Failed      |
| PIC+32-bit         | Passed    | Passed     | Passed       |
| PIC+Profile        |  Failed   |  Failed    |  Failed      |
| PIC+Profile+32-bit |  Failed   |  Failed    |  Failed      |
+------------------------------------------------------------+

Long term there is an option to refacotr the framework for C and C++ tests,
in order to reduce code duplication.

Patches sent by Yang Zheng <tomsun.0.7@gmail.com>