tree b0a2d4fce25eb0d1cc62d3edf2347a7bcd9f1bf7
parent 2f04cc3666aa41562bc9e971403674d2a5ead114
author Martin Storsjö <martin@martin.st> 1659343844 +0300
committer Copybara-Service <copybara-worker@google.com> 1659427585 -0700

[OpenMP] Only include CMAKE_DL_LIBS on unix platforms

CMAKE_DL_LIBS is documented as "Name of library containing dlopen
and dlclose".

On Windows platforms, there's no system provided dlopen/dlclose, but
it can be argued that if you really intend to call dlopen/dlclose,
you're going to be using a third party compat library like
https://github.com/dlfcn-win32/dlfcn-win32, and CMAKE_DL_LIBS should
expand to its name.

This has been argued upstream in CMake in
https://gitlab.kitware.com/cmake/cmake/-/issues/17600 and
https://gitlab.kitware.com/cmake/cmake/-/merge_requests/1642, that
CMAKE_DL_LIBS should expand to "dl" on mingw platforms.

The merge request wasn't merged though, as it caused some amount of
breakage, but in practice, Fedora still carries a custom CMake patch
with the same effect.

Thus, this patch fixes cross compiling OpenMP for mingw targets
on Fedora with their custom-patched CMake.

Differential Revision: https://reviews.llvm.org/D130892

GitOrigin-RevId: 7f24fd26a8abaef2fa4561aa399adde81d9c563a