[PATCH] D57406: build: remove use of llvm-config

[Saleem Abdulrasool via Phabricator via llvm-commits]

compnerd updated this revision to Diff 184368.
compnerd added a comment.

Restore `LLVM_MAIN_SRC_DIR` cache variable


Repository:
  rLLD LLVM Linker

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D57406/new/

https://reviews.llvm.org/D57406

Files:
  CMakeLists.txt


Index: CMakeLists.txt
===================================================================
--- CMakeLists.txt
+++ CMakeLists.txt
@@ -6,50 +6,42 @@
   set(CMAKE_INCLUDE_CURRENT_DIR ON)
   set(LLD_BUILT_STANDALONE TRUE)
 
-  find_program(LLVM_CONFIG_PATH "llvm-config" DOC "Path to llvm-config binary")
-  if(NOT LLVM_CONFIG_PATH)
-    message(FATAL_ERROR "llvm-config not found: specify LLVM_CONFIG_PATH")
-  endif()
-
-  execute_process(COMMAND "${LLVM_CONFIG_PATH}"
-                          "--obj-root"
-                          "--includedir"
-                          "--cmakedir"
-                          "--src-root"
-                  RESULT_VARIABLE HAD_ERROR
-                  OUTPUT_VARIABLE LLVM_CONFIG_OUTPUT
-                  OUTPUT_STRIP_TRAILING_WHITESPACE)
-  if(HAD_ERROR)
-    message(FATAL_ERROR "llvm-config failed with status ${HAD_ERROR}")
-  endif()
-
-  string(REGEX REPLACE "[ \t]*[\r\n]+[ \t]*" ";" LLVM_CONFIG_OUTPUT "${LLVM_CONFIG_OUTPUT}")
-
-  list(GET LLVM_CONFIG_OUTPUT 0 OBJ_ROOT)
-  list(GET LLVM_CONFIG_OUTPUT 1 MAIN_INCLUDE_DIR)
-  list(GET LLVM_CONFIG_OUTPUT 2 LLVM_CMAKE_PATH)
-  list(GET LLVM_CONFIG_OUTPUT 3 MAIN_SRC_DIR)
-
-  set(LLVM_OBJ_ROOT ${OBJ_ROOT} CACHE PATH "path to LLVM build tree")
-  set(LLVM_MAIN_INCLUDE_DIR ${MAIN_INCLUDE_DIR} CACHE PATH "path to llvm/include")
-  set(LLVM_MAIN_SRC_DIR ${MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
-
-  file(TO_CMAKE_PATH ${LLVM_OBJ_ROOT} LLVM_BINARY_DIR)
-
-  if(NOT EXISTS "${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
-    message(FATAL_ERROR "LLVMConfig.cmake not found")
-  endif()
-  include("${LLVM_CMAKE_PATH}/LLVMConfig.cmake")
-
+  find_package(LLVM REQUIRED CONFIG NO_CMAKE_FIND_ROOT_PATH)
   list(APPEND CMAKE_MODULE_PATH "${LLVM_CMAKE_PATH}")
+  set(LLVM_MAIN_SRC_DIR ${LLVM_BUILD_MAIN_SRC_DIR} CACHE PATH "Path to LLVM source tree")
 
   set(PACKAGE_VERSION "${LLVM_PACKAGE_VERSION}")
-  include_directories("${LLVM_BINARY_DIR}/include" ${LLVM_INCLUDE_DIRS})
+  include_directories(${LLVM_INCLUDE_DIRS})
   link_directories(${LLVM_LIBRARY_DIRS})
 
   set(LLVM_LIBRARY_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/lib${LLVM_LIBDIR_SUFFIX})
   set(LLVM_RUNTIME_OUTPUT_INTDIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR}/bin)
-  find_program(LLVM_TABLEGEN_EXE "llvm-tblgen" ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
+
+  if(CMAKE_CROSSCOMPILING)
+    set(LLVM_NATIVE_BUILD "${LLVM_BINARY_DIR}/NATIVE")
+    if(NOT EXISTS "${LLVM_NATIVE_BUILD}")
+      message(FATAL_ERROR
+        "Attempting to cross-compiling lld standalone but no native LLVM build
+        found.  Please cross-compile LLVM as well.")
+    endif()
+
+    if(CMAKE_HOST_SYSTEM_NAME MATCHES Windows)
+      set(HOST_EXECUTABLE_SUFFIX ".exe")
+    endif()
+
+    if(NOT CMAKE_CONFIGURATION_TYPES)
+      find_program(LLVM_TABLEGEN_EXE
+        "${LLVM_NATIVE_BUILD_DIR}/bin/llvm-tblgen${HOST_EXECUTABLE_SUFFIX}")
+    else()
+      # NOTE: LLVM NATIVE build is always built Release, as is specified in
+      # CrossCompile.cmake
+      find_program(LLVM_TABLEGEN_EXE
+        "${LLVM_NATIVE_BUILD_DIR}/Release/bin/llvm-tblgen${HOST_EXECUTABLE_SUFFIX}")
+    endif()
+  else()
+    find_program(LLVM_TABLEGEN_EXE "llvm-tblgen" ${LLVM_TOOLS_BINARY_DIR}
+      NO_DEFAULT_PATH)
+  endif()
 
   include(AddLLVM)
   include(TableGen)


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