[cmake] move FindLLVM to its own file

2 files changed, 98 insertions, 61 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ea1ca3d37b2..ae2c67b59bf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1059,70 +1059,13 @@ if(UNIX AND NOT APPLE)
 		endif()
 	endif()
 
-	# XXX Maybe most of this section should go into an llvm module?
 	if(WITH_LLVM)
+        find_package_wrapper(LLVM)
 
-		if(LLVM_ROOT_DIR)
-			if(NOT DEFINED LLVM_VERSION)
-				find_program(LLVM_CONFIG llvm-config-${LLVM_VERSION} HINTS ${LLVM_ROOT_DIR}/bin NO_CMAKE_PATH)
-			endif()
-			if(NOT LLVM_CONFIG)
-				find_program(LLVM_CONFIG llvm-config HINTS ${LLVM_ROOT_DIR}/bin NO_CMAKE_PATH)
-			endif()
-		else()
-			if(NOT DEFINED LLVM_VERSION)
-				find_program(LLVM_CONFIG llvm-config-${LLVM_VERSION})
-			endif()
-			if(NOT LLVM_CONFIG)
-				find_program(LLVM_CONFIG llvm-config)
-			endif()
-		endif()
-
-		if(NOT DEFINED LLVM_VERSION)
-			execute_process(COMMAND ${LLVM_CONFIG} --version
-							OUTPUT_VARIABLE LLVM_VERSION
-							OUTPUT_STRIP_TRAILING_WHITESPACE)
-			set(LLVM_VERSION ${LLVM_VERSION} CACHE STRING "Version of LLVM to use")
+        if(NOT LLVM_FOUND)
+			set(WITH_LLVM OFF)
+			message(STATUS "LLVM not found")
 		endif()
-		if(NOT DEFINED LLVM_ROOT_DIR)
-			execute_process(COMMAND ${LLVM_CONFIG} --prefix
-							OUTPUT_VARIABLE LLVM_ROOT_DIR
-							OUTPUT_STRIP_TRAILING_WHITESPACE)
-			set(LLVM_ROOT_DIR ${LLVM_ROOT_DIR} CACHE PATH "Path to the LLVM installation")
-		endif()
-		if(NOT DEFINED LLVM_LIBPATH)
-			execute_process(COMMAND ${LLVM_CONFIG} --libdir
-							OUTPUT_VARIABLE LLVM_LIBPATH
-							OUTPUT_STRIP_TRAILING_WHITESPACE)
-			set(LLVM_LIBPATH ${LLVM_LIBPATH} CACHE PATH "Path to the LLVM library path")
-			mark_as_advanced(LLVM_LIBPATH)
-		endif()
-
-		if(LLVM_STATIC)
-			find_library(LLVM_LIBRARY
-			             NAMES LLVMAnalysis # first of a whole bunch of libs to get
-			             PATHS ${LLVM_LIBPATH})
-		else()
-			find_library(LLVM_LIBRARY
-			             NAMES LLVM-${LLVM_VERSION}
-			             PATHS ${LLVM_LIBPATH})
-		endif()
-
-
-		if(LLVM_LIBRARY AND LLVM_ROOT_DIR AND LLVM_LIBPATH)
-			if(LLVM_STATIC)
-				# if static LLVM libraries were requested, use llvm-config to generate
-				# the list of what libraries we need, and substitute that in the right
-				# way for LLVM_LIBRARY.
-				execute_process(COMMAND ${LLVM_CONFIG} --libfiles
-				                OUTPUT_VARIABLE LLVM_LIBRARY
-				                OUTPUT_STRIP_TRAILING_WHITESPACE)
-				string(REPLACE " " ";" LLVM_LIBRARY "${LLVM_LIBRARY}")
-			endif()
-		else()
-			message(FATAL_ERROR "LLVM not found.")
-		endif()
-
 	endif()
 
 	if(WITH_LLVM OR WITH_SDL_DYNLOAD)
diff --git a/build_files/cmake/Modules/FindLLVM.cmake b/build_files/cmake/Modules/FindLLVM.cmake
new file mode 100644
index 00000000000..43791c8df8c
--- /dev/null
+++ b/build_files/cmake/Modules/FindLLVM.cmake
@@ -0,0 +1,94 @@
+# - Find LLVM library
+# Find the native LLVM includes and library
+# This module defines
+#  LLVM_INCLUDE_DIRS, where to find LLVM.h, Set when LLVM_INCLUDE_DIR is found.
+#  LLVM_LIBRARIES, libraries to link against to use LLVM.
+#  LLVM_ROOT_DIR, The base directory to search for LLVM.
+#                This can also be an environment variable.
+#  LLVM_FOUND, If false, do not try to use LLVM.
+#
+# also defined, but not for general use are
+#  LLVM_LIBRARY, where to find the LLVM library.
+
+#=============================================================================
+# Copyright 2015 Blender Foundation.
+#
+# Distributed under the OSI-approved BSD License (the "License");
+# see accompanying file Copyright.txt for details.
+#
+# This software is distributed WITHOUT ANY WARRANTY; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# See the License for more information.
+#=============================================================================
+
+if(LLVM_ROOT_DIR)
+	if(DEFINED LLVM_VERSION)
+		find_program(LLVM_CONFIG llvm-config-${LLVM_VERSION} HINTS ${LLVM_ROOT_DIR}/bin NO_CMAKE_PATH)
+	endif()
+	if(NOT LLVM_CONFIG)
+		find_program(LLVM_CONFIG llvm-config HINTS ${LLVM_ROOT_DIR}/bin NO_CMAKE_PATH)
+	endif()
+else()
+	if(DEFINED LLVM_VERSION)
+        message(running llvm-config-${LLVM_VERSION})
+		find_program(LLVM_CONFIG llvm-config-${LLVM_VERSION})
+	endif()
+	if(NOT LLVM_CONFIG)
+		find_program(LLVM_CONFIG llvm-config)
+	endif()
+endif()
+
+if(NOT DEFINED LLVM_VERSION)
+	execute_process(COMMAND ${LLVM_CONFIG} --version
+					OUTPUT_VARIABLE LLVM_VERSION
+					OUTPUT_STRIP_TRAILING_WHITESPACE)
+	set(LLVM_VERSION ${LLVM_VERSION} CACHE STRING "Version of LLVM to use")
+endif()
+if(NOT LLVM_ROOT_DIR)
+	execute_process(COMMAND ${LLVM_CONFIG} --prefix
+					OUTPUT_VARIABLE LLVM_ROOT_DIR
+					OUTPUT_STRIP_TRAILING_WHITESPACE)
+	set(LLVM_ROOT_DIR ${LLVM_ROOT_DIR} CACHE PATH "Path to the LLVM installation")
+endif()
+if(NOT LLVM_LIBPATH)
+	execute_process(COMMAND ${LLVM_CONFIG} --libdir
+					OUTPUT_VARIABLE LLVM_LIBPATH
+					OUTPUT_STRIP_TRAILING_WHITESPACE)
+	set(LLVM_LIBPATH ${LLVM_LIBPATH} CACHE PATH "Path to the LLVM library path")
+	mark_as_advanced(LLVM_LIBPATH)
+endif()
+
+if(LLVM_STATIC)
+	find_library(LLVM_LIBRARY
+	             NAMES LLVMAnalysis # first of a whole bunch of libs to get
+	             PATHS ${LLVM_LIBPATH})
+else()
+	find_library(LLVM_LIBRARY
+	             NAMES LLVM-${LLVM_VERSION}
+	             PATHS ${LLVM_LIBPATH})
+endif()
+
+
+if(LLVM_LIBRARY AND LLVM_ROOT_DIR AND LLVM_LIBPATH)
+	if(LLVM_STATIC)
+		# if static LLVM libraries were requested, use llvm-config to generate
+		# the list of what libraries we need, and substitute that in the right
+		# way for LLVM_LIBRARY.
+		execute_process(COMMAND ${LLVM_CONFIG} --libfiles
+		                OUTPUT_VARIABLE LLVM_LIBRARY
+		                OUTPUT_STRIP_TRAILING_WHITESPACE)
+		string(REPLACE " " ";" LLVM_LIBRARY "${LLVM_LIBRARY}")
+	endif()
+endif()
+
+
+# handle the QUIETLY and REQUIRED arguments and set SDL2_FOUND to TRUE if
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(LLVM DEFAULT_MSG
+    LLVM_LIBRARY)
+
+MARK_AS_ADVANCED(
+  LLVM_LIBRARY
+)
+