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I'm currently working to port `libc++` to Solaris. There exists a slightly bitrotten port already, which was done on Illumos, an OpenSolaris derivative. In order not to break that port with my work, I need to test the result on both Solaris and Illumos. While doing so, it turned out that Illumos `ld` doesn't support the `-z discard-sections=unused` option currently used on SunOS unconditionally. While there exists a patch <https://github.com/OpenIndiana/oi-userland/blob/oi/hipster/components/developer/clang-90/patches/02-cmake_modules_AddLLVM.cmake.patch> for LLVM 9.0 in the OpenIndiana repository, it apparently hasn't been submitted upstream and is completely wrong: it replaces `-z discard-sections=unused` with `-z ignore`. In terms of the equivalent `gld` options, this means replacing `--gc-sections` with `--as-needed`. This patch instead tests if the linker actually supports the option before using it. Tested on `amd64-pc-solaris2.11` (all of Solaris 11.4, 11.3 and OpenIndiana 2020.04). Differential Revision: https://reviews.llvm.org/D81545
See docs/CMake.html for instructions on how to build LLVM with CMake.