[Bug 234050] devel/cmake: find_package(OpenMP) doesn't find the openmp package (when clang from devel/llvm70 is used)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234050

--- Comment #4 from Yuri Victorovich <yuri at freebsd.org> ---
Created attachment 200160
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200160&action=edit
testcase-broken-OpenMP-detection.shar

(In reply to Rainer Hurling from comment #3)

Hi Rainer,

I'm attaching the testcase that demonstrates that OpenMP detection is broken
with clang70.

1. Extract the attached case: sh testcase-broken-OpenMP-detection.shar
2. cd testcase-broken-OpenMP-detection
3. sh run
4. Observe the failure: helloworld.cpp:(.text+0x2d): undefined reference to
`__kmpc_fork_call'

It closely follows the recommended way:
https://cliutils.gitlab.io/modern-cmake/chapters/packages/OpenMP.html

Yuri

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