[all-commits] [llvm/llvm-project] d83983: [OpenMP] Use TLS for gtid on Solaris (#138508)

[Rainer Orth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d83983999d975357ada46d482c29b83fac41b90c
      https://github.com/llvm/llvm-project/commit/d83983999d975357ada46d482c29b83fac41b90c
  Author: Rainer Orth <ro at gcc.gnu.org>
  Date:   2025-05-06 (Tue, 06 May 2025)

  Changed paths:
    M openmp/runtime/src/kmp_global.cpp

  Log Message:
  -----------
  [OpenMP] Use TLS for gtid on Solaris (#138508)

When running the `openmp` testsuite on Solaris/amd64, many tests `FAIL`
like

```
# | OMP: Error #11: Stack overflow detected for OpenMP thread #1
```

In a `Debug` build, I also get
```
# | Assertion failure at kmp_runtime.cpp(203): __kmp_gtid_get_specific() < 0 || __kmp_gtid_get_specific() == i.
```

Further investigation shows that just setting `__kmp_gtid_mode` to 3
massively reduces the number of failures.

Tested on `amd64-pc-solaris2.11` and `x86_64-pc-linux-gnu`.



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