[all-commits] [llvm/llvm-project] 68a235: build: reduce CMake handling for zlib

[Saleem Abdulrasool via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 68a235d07f9e7049c7eb0c8091f37e385327ac28
      https://github.com/llvm/llvm-project/commit/68a235d07f9e7049c7eb0c8091f37e385327ac28
  Author: Saleem Abdulrasool <compnerd at compnerd.org>
  Date:   2020-01-01 (Wed, 01 Jan 2020)

  Changed paths:
    M clang/test/CMakeLists.txt
    M clang/test/lit.site.cfg.py.in
    M compiler-rt/test/lit.common.configured.in
    M lld/test/CMakeLists.txt
    M lld/test/lit.site.cfg.py.in
    M lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunication.cpp
    M lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
    M llvm/cmake/config-ix.cmake
    M llvm/include/llvm/Config/config.h.cmake
    M llvm/lib/Support/CMakeLists.txt
    M llvm/lib/Support/CRC.cpp
    M llvm/lib/Support/Compression.cpp
    M llvm/test/CMakeLists.txt
    M llvm/test/lit.site.cfg.py.in
    M llvm/unittests/Support/CompressionTest.cpp

  Log Message:
  -----------
  build: reduce CMake handling for zlib

Rather than handling zlib handling manually, use `find_package` from CMake
to find zlib properly. Use this to normalize the `LLVM_ENABLE_ZLIB`,
`HAVE_ZLIB`, `HAVE_ZLIB_H`. Furthermore, require zlib if `LLVM_ENABLE_ZLIB` is
set to `YES`, which requires the distributor to explicitly select whether
zlib is enabled or not. This simplifies the CMake handling and usage in
the rest of the tooling.