Steffen Dettmer d4e551a90b FindThreads: Drop try_run to improve cross-compiling support ...

Use `try_compile` instead of `try_run`.  It is not clear why `try_run`
was ever needed, and it does not work during cross-compiling.

Update the check's source file to remove code associated with actually
running things.  Also remove the ancient `__CLASSIC_C__` code path and
use a simple `int main(void)` as in `Modules/CheckIncludeFile.c.in`.

Fixes: #16920

2017-08-30 11:15:26 -04:00

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