Add some configure/CMake options for enabling/disabling Subzero targets.

CMakeLists.txt

 # See docs/CMake.html for instructions about how to build LLVM with CMake.
 
 cmake_minimum_required(VERSION 2.8.8)
 
 # FIXME: It may be removed when we use 2.8.12.
 if(CMAKE_VERSION VERSION_LESS 2.8.12)
   # Invalidate a couple of keywords.
   set(cmake_2_8_12_INTERFACE)
   set(cmake_2_8_12_PRIVATE)
 else()
@@ skipping 207 matching lines @@
 
 set(LLVM_TARGET_ARCH "host"
   CACHE STRING "Set target to use for LLVM JIT or use \"host\" for automatic detection.")
 
 option(LLVM_ENABLE_TERMINFO "Use terminfo database if available." ON)
 
 option(LLVM_ENABLE_THREADS "Use threads if available." ON)
 
 option(LLVM_ENABLE_ZLIB "Use zlib for compression/decompression if available." ON)
 
+set(SUBZERO_TARGETS_TO_BUILD "none"
+    CACHE STRING "Semicolon-separated list of targets to build, or \"none\".")
+
+if( SUBZERO_TARGETS_TO_BUILD STREQUAL "none" )
+  set( SUBZERO_TARGETS_TO_BUILD "" )
+endif()
+
 if( LLVM_TARGETS_TO_BUILD STREQUAL "all" )
   set( LLVM_TARGETS_TO_BUILD ${LLVM_ALL_TARGETS} )
 endif()
 
 set(LLVM_TARGETS_TO_BUILD
    ${LLVM_TARGETS_TO_BUILD}
    ${LLVM_EXPERIMENTAL_TARGETS_TO_BUILD})
 list(REMOVE_DUPLICATES LLVM_TARGETS_TO_BUILD)
 
 include(AddLLVMDefinitions)
@@ skipping 212 matching lines @@
   if( EXISTS ${td}/AsmParser/CMakeLists.txt )
     set(LLVM_ENUM_ASM_PARSERS
       "${LLVM_ENUM_ASM_PARSERS}LLVM_ASM_PARSER(${t})\n")
   endif()
   if( EXISTS ${td}/Disassembler/CMakeLists.txt )
     set(LLVM_ENUM_DISASSEMBLERS
       "${LLVM_ENUM_DISASSEMBLERS}LLVM_DISASSEMBLER(${t})\n")
   endif()
 endforeach(t)
 
+set(SUBZERO_ENUM_TARGETS "")
+foreach(t ${SUBZERO_TARGETS_TO_BUILD})
+  set(SUBZERO_ENUM_TARGETS "${SUBZERO_ENUM_TARGETS}SUBZERO_TARGET(${t})\n")
+endforeach(t)
+
 # Produce the target definition files, which provide a way for clients to easily
 # include various classes of targets.
 configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/AsmPrinters.def.in
   ${LLVM_INCLUDE_DIR}/llvm/Config/AsmPrinters.def
   )
 configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/AsmParsers.def.in
   ${LLVM_INCLUDE_DIR}/llvm/Config/AsmParsers.def
   )
 configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/Disassemblers.def.in
   ${LLVM_INCLUDE_DIR}/llvm/Config/Disassemblers.def
   )
 configure_file(
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/SZTargets.def.in
+  ${LLVM_INCLUDE_DIR}/llvm/Config/SZTargets.def
+  )
+configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/Targets.def.in
   ${LLVM_INCLUDE_DIR}/llvm/Config/Targets.def
   )
 
 # Configure the three LLVM configuration header files.
 configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/config.h.cmake
   ${LLVM_INCLUDE_DIR}/llvm/Config/config.h)
 configure_file(
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Config/llvm-config.h.cmake
@@ skipping 162 matching lines @@
     PATTERN "*.def"
     PATTERN "*.h"
     PATTERN "*.gen"
     PATTERN "*.inc"
     # Exclude include/llvm/CMakeFiles/intrinsics_gen.dir, matched by "*.def"
     PATTERN "CMakeFiles" EXCLUDE
     PATTERN "config.h" EXCLUDE
     PATTERN ".svn" EXCLUDE
     )
 endif()