tree fed870be2d74044a9f15aa7b7161b6db05be77ed
parent e6063a4ac595c5982a2459a1b0bf5a1872f4c3fb
author Michael Kruse <llvm-project@meinersbur.de> 1706227931 -0600
committer Copybara-Service <copybara-worker@google.com> 1706228107 -0800

[OpenMP] Disable LTO build of libomptarget and plugins by default. (#79387)

CheckIPOSupported is used to test for working LTO since #74520. However, before CMake 3.24 this will test the default linker and ignore options such as LLVM_ENABLE_LLD. As a result, CMake would test whether LTO works with the default linker but builds with another one. In a typical scenario, libomptarget is compiled with the in-tree Clang, but linked with ld.gold, which requires the LLVMgold plugin, when it actually would work with the lld linker (or also fail because the system lld is too old to understand opaque pointers). Using gcc as the compiler would pass the test, but fail when linking with lld since does not understand gcc's LTO format.

Disable LTO by default for now since automatic detection causes too many problems. It causes the openmp-offload-cuda-project buildbot (https://lab.llvm.org/staging/#/builders/151) to fail and LLVM_ENABLE_RUNTIMES=openmp builds will have it implicitly disabled in the vast majority of system configurations anyway.

GitOrigin-RevId: b1938b716a3ef75a518bdebec12c240415bf0fef