[all-commits] [llvm/llvm-project] 785e7f: Remember LLVM_ENABLE_LIBCXX setting in installed c...

[Michael Kruse via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 785e7f06ddb1ba36aa679d23436726dcf61f8afb
      https://github.com/llvm/llvm-project/commit/785e7f06ddb1ba36aa679d23436726dcf61f8afb
  Author: Michael Kruse <llvm-project at meinersbur.de>
  Date:   2025-04-10 (Thu, 10 Apr 2025)

  Changed paths:
    M llvm/cmake/modules/LLVMConfig.cmake.in

  Log Message:
  -----------
  Remember LLVM_ENABLE_LIBCXX setting in installed configuration (#134990)

The buidbot
[flang-aarch64-libcxx](https://lab.llvm.org/buildbot/#/builders/89) is
currently failing with an ABI issue. The suspected reason is that
LLVMSupport.a is built using libc++, but the unittests are using the
default C++ standard library, libstdc++ in this case. This predefined
`llvm_gtest` target uses the LLVMSupport from `find_package(LLVM)`,
which finds the libc++-built LLVMSupport.

To fix, store the `LLVM_ENABLE_LIBCXX` setting in the LLVMConfig.cmake
such that everything that links to LLVM libraries use the same standard
library. In this case discussed in
https://github.com/llvm/llvm-zorg/pull/387 it was the flang-rt
unittests, but other runtimes with GTest unittests should have the same
issue (e.g. offload), and any external project that uses
`find_package(LLVM)`.



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