Commits on Sep 3, 2024

1. [libcxx] [ci] Add a test configuration with an incomplete sysroot …

   When bringing up a new cross compiler from scratch, we build
   libunwind/libcxx in a setup where the toolchain is incomplete and
   unable to perform the normal linker checks; this requires a few
   special cases in the CMake files.
   
   We simulate that scenario by removing the libc++ headers, libunwind
   and libc++ libraries from the installed toolchain.
   
   We need to set CMAKE_CXX_COMPILER_WORKS since CMake fails to
   probe the compiler. We need to set CMAKE_CXX_COMPILER_TARGET,
   since LLVM's heuristics fail when CMake hasn't been able to
   probe the environment properly. (This is normal; one has to
   set those options when setting up such a toolchain from scratch.)
   
   This adds CI coverage for these build scenarios, which otherwise
   seldom are tested by some build flow (but are essential when setting
   up a cross compiler from scratch).

   

   mstorsjo committed Sep 3, 2024
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