[llvm] [llvm][Support] Add support for thread naming under DragonFly BSD and Solaris/illumos (PR #106944)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `sanitizer-x86_64-linux` running on `sanitizer-buildbot2` while building `llvm` at step 2 "annotate".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/66/builds/3372

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 2 (annotate) failure: 'python ../sanitizer_buildbot/sanitizers/zorg/buildbot/builders/sanitizers/buildbot_selector.py' (failure)
...
[379/384] Generating MSAN_INST_GTEST.gtest-all.cc.x86_64.o
[380/384] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64-with-call.o
[381/384] Generating Msan-x86_64-with-call-Test
[382/384] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64.o
[383/384] Generating Msan-x86_64-Test
[383/384] Running compiler_rt regression tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 10229 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
TIMEOUT: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c (10229 of 10229)
******************** TEST 'SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c' FAILED ********************
Exit Code: -9
Timeout: Reached timeout of 900 seconds

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing  -m64 -funwind-tables  -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp && env HWASAN_OPTIONS=die_after_fork=0  /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing -m64 -funwind-tables -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
==3627989==ERROR: HWAddressSanitizer: invalid-free on address 0x485a00000000 at pc 0x5d1c4c126bf7 on thread T2
tags: 05/00 (ptr/mem)
==3627937==ERROR: HWAddressSanitizer: invalid-free on address 0x486200000000 at pc 0x5d1c4c126bf7 on thread T1
tags: 07/51 (ptr/mem)

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
900.07s: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c
141.17s: libFuzzer-x86_64-default-Linux :: out-of-process-fuzz.test
134.06s: libFuzzer-x86_64-libcxx-Linux :: out-of-process-fuzz.test
126.63s: libFuzzer-x86_64-static-libcxx-Linux :: out-of-process-fuzz.test
57.37s: ThreadSanitizer-x86_64 :: bench_threads.cpp
46.11s: libFuzzer-i386-libcxx-Linux :: fork_corpus_groups.test
43.57s: libFuzzer-i386-default-Linux :: fork_corpus_groups.test
43.18s: libFuzzer-i386-libcxx-Linux :: fork.test
42.15s: libFuzzer-i386-default-Linux :: disable-leaks.test
41.08s: libFuzzer-i386-static-libcxx-Linux :: fork_corpus_groups.test
40.78s: libFuzzer-i386-default-Linux :: fork.test
40.08s: libFuzzer-x86_64-libcxx-Linux :: fork.test
40.06s: libFuzzer-x86_64-static-libcxx-Linux :: fork.test
40.03s: libFuzzer-x86_64-libcxx-Linux :: fork_corpus_groups.test
39.77s: libFuzzer-i386-static-libcxx-Linux :: fork.test
39.52s: libFuzzer-x86_64-default-Linux :: fork.test
39.24s: libFuzzer-x86_64-default-Linux :: fork_corpus_groups.test
38.87s: libFuzzer-x86_64-static-libcxx-Linux :: fork_corpus_groups.test
38.44s: libFuzzer-i386-static-libcxx-Linux :: disable-leaks.test
Step 9 (test compiler-rt symbolizer) failure: test compiler-rt symbolizer (failure)
...
[379/384] Generating MSAN_INST_GTEST.gtest-all.cc.x86_64.o
[380/384] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64-with-call.o
[381/384] Generating Msan-x86_64-with-call-Test
[382/384] Generating MSAN_INST_TEST_OBJECTS.msan_test.cpp.x86_64.o
[383/384] Generating Msan-x86_64-Test
[383/384] Running compiler_rt regression tests
llvm-lit: /home/b/sanitizer-x86_64-linux/build/llvm-project/llvm/utils/lit/lit/main.py:72: note: The test suite configuration requested an individual test timeout of 0 seconds but a timeout of 900 seconds was requested on the command line. Forcing timeout to be 900 seconds.
-- Testing: 10229 tests, 88 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
TIMEOUT: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c (10229 of 10229)
******************** TEST 'SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c' FAILED ********************
Exit Code: -9
Timeout: Reached timeout of 900 seconds

Command Output (stderr):
--
RUN: at line 1: /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang  -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing  -m64 -funwind-tables  -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp && env HWASAN_OPTIONS=die_after_fork=0  /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ /home/b/sanitizer-x86_64-linux/build/build_default/./bin/clang -gline-tables-only -fsanitize=hwaddress -fuse-ld=lld -fsanitize-hwaddress-experimental-aliasing -m64 -funwind-tables -I/home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test -ldl -O0 /home/b/sanitizer-x86_64-linux/build/llvm-project/compiler-rt/test/sanitizer_common/TestCases/Posix/fork_threaded.c -o /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
+ env HWASAN_OPTIONS=die_after_fork=0 /home/b/sanitizer-x86_64-linux/build/build_default/runtimes/runtimes-bins/compiler-rt/test/sanitizer_common/hwasan-x86_64-Linux/Posix/Output/fork_threaded.c.tmp
==3627989==ERROR: HWAddressSanitizer: invalid-free on address 0x485a00000000 at pc 0x5d1c4c126bf7 on thread T2
tags: 05/00 (ptr/mem)
==3627937==ERROR: HWAddressSanitizer: invalid-free on address 0x486200000000 at pc 0x5d1c4c126bf7 on thread T1
tags: 07/51 (ptr/mem)

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 
Slowest Tests:
--------------------------------------------------------------------------
900.07s: SanitizerCommon-hwasan-x86_64-Linux :: Posix/fork_threaded.c
141.17s: libFuzzer-x86_64-default-Linux :: out-of-process-fuzz.test
134.06s: libFuzzer-x86_64-libcxx-Linux :: out-of-process-fuzz.test
126.63s: libFuzzer-x86_64-static-libcxx-Linux :: out-of-process-fuzz.test
57.37s: ThreadSanitizer-x86_64 :: bench_threads.cpp
46.11s: libFuzzer-i386-libcxx-Linux :: fork_corpus_groups.test
43.57s: libFuzzer-i386-default-Linux :: fork_corpus_groups.test
43.18s: libFuzzer-i386-libcxx-Linux :: fork.test
42.15s: libFuzzer-i386-default-Linux :: disable-leaks.test
41.08s: libFuzzer-i386-static-libcxx-Linux :: fork_corpus_groups.test
40.78s: libFuzzer-i386-default-Linux :: fork.test
40.08s: libFuzzer-x86_64-libcxx-Linux :: fork.test
40.06s: libFuzzer-x86_64-static-libcxx-Linux :: fork.test
40.03s: libFuzzer-x86_64-libcxx-Linux :: fork_corpus_groups.test
39.77s: libFuzzer-i386-static-libcxx-Linux :: fork.test
39.52s: libFuzzer-x86_64-default-Linux :: fork.test
39.24s: libFuzzer-x86_64-default-Linux :: fork_corpus_groups.test
38.87s: libFuzzer-x86_64-static-libcxx-Linux :: fork_corpus_groups.test
38.44s: libFuzzer-i386-static-libcxx-Linux :: disable-leaks.test

```

</details>

https://github.com/llvm/llvm-project/pull/106944