[libc++][NFC] Promote CMake comment to an actual option description git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@356386 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/CMakeLists.txt b/CMakeLists.txt index 5920cfd..0c20cc3 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt 
@@ -172,9 +172,9 @@  set(LIBCXX_CXX_ABI_LIBNAME "${LIBCXX_CXX_ABI}")  endif()   -# Use a static copy of the ABI library when linking libc++. This option -# cannot be used with LIBCXX_ENABLE_ABI_LINKER_SCRIPT. -option(LIBCXX_ENABLE_STATIC_ABI_LIBRARY "Statically link the ABI library" OFF) +option(LIBCXX_ENABLE_STATIC_ABI_LIBRARY + "Use a static copy of the ABI library when linking libc++. + This option cannot be used with LIBCXX_ENABLE_ABI_LINKER_SCRIPT." OFF)    cmake_dependent_option(LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY  "Statically link the ABI library to static library" ON