[CIR] Remove LLVM_ENABLE_PROJECTS support

ghstack-source-id: 8555196
Pull Request resolved: #424

Author: lanza

llvm/CMakeLists.txt

@@ -114,7 +114,7 @@ endif()
 # LLVM_EXTERNAL_${project}_SOURCE_DIR using LLVM_ALL_PROJECTS
 # This allows an easy way of setting up a build directory for llvm and another
 # one for llvm+clang+... using the same sources.
-set(LLVM_ALL_PROJECTS "bolt;cir;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly;pstl")
+set(LLVM_ALL_PROJECTS "bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly;pstl")
 # The flang project is not yet part of "all" projects (see C++ requirements)
 set(LLVM_EXTRA_PROJECTS "flang")
 # List of all known projects in the mono repo
@@ -142,17 +142,6 @@ if ("flang" IN_LIST LLVM_ENABLE_PROJECTS)
   endif()
 endif()
 
-if ("cir" IN_LIST LLVM_ENABLE_PROJECTS)
-  if (NOT "mlir" IN_LIST LLVM_ENABLE_PROJECTS)
-    message(STATUS "Enabling MLIR as a dependency to CIR")
-    list(APPEND LLVM_ENABLE_PROJECTS "mlir")
-  endif()
-
-  if (NOT "clang" IN_LIST LLVM_ENABLE_PROJECTS)
-    message(FATAL_ERROR "Clang is not enabled, but is required to use CIR")
-  endif()
-endif()
-
 # Select the runtimes to build
 #
 # As we migrate runtimes to using the bootstrapping build, the set of default runtimes
@@ -233,13 +222,6 @@ if (LLVM_ENABLE_PROJECTS_USED OR NOT LLVM_ENABLE_PROJECTS STREQUAL "")
     string(REGEX REPLACE "-" "_" upper_proj ${upper_proj})
     if ("${proj}" IN_LIST LLVM_ENABLE_PROJECTS)
       message(STATUS "${proj} project is enabled")
-      # ClangIR is integrated inside clang and also provides the cir-opt,
-      # it needs some special handling.
-      if ("${proj}" STREQUAL "cir")
-        set(CLANG_ENABLE_CIR ON)
-        continue()
-      endif()
-
       set(SHOULD_ENABLE_PROJECT TRUE)
       set(PROJ_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../${proj}")
       if(NOT EXISTS "${PROJ_DIR}" OR NOT IS_DIRECTORY "${PROJ_DIR}")