From f44ed1e33c85254a6176b1db3775b9b13baaaa29 Mon Sep 17 00:00:00 2001
From: Christoph Egger <Christoph.Egger@fau.de>
Date: Tue, 10 Mar 2015 12:38:13 +0100
Subject: [PATCH] Move LLVM logic to extra cmake module

---
 CMakeLists.txt               | 20 +-------------------
 cmake/Modules/FindLLVM.cmake | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 19 deletions(-)
 create mode 100644 cmake/Modules/FindLLVM.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae7acd7..c88c46a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,10 +7,10 @@ set(CMAKE_AUTOMOC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules")
 
-
 find_package(Qt5Widgets)
 find_package(Qt5 CONFIG REQUIRED Widgets Gui)
 find_package(QuaZip REQUIRED)
+find_package(LLVM REQUIRED)
 find_package(PkgConfig)
 pkg_check_modules(LOG4CXX REQUIRED liblog4cxx)
 pkg_check_modules(GUILE REQUIRED guile-2.0)
@@ -19,24 +19,6 @@ pkg_check_modules(GUILE REQUIRED guile-2.0)
 add_definitions(${LOG4CXX_CFLAGS})
 add_definitions(${GUILE_CFLAGS})
 
-find_program(LLVM_CONFIG llvm-config-3.5)
-
-if(NOT LLVM_CONFIG)
-  message(FATAL_ERROR "LLVM not found")
-endif()
-
-execute_process(COMMAND ${LLVM_CONFIG} --cxxflags    OUTPUT_VARIABLE LLVM_CFLAGS      OUTPUT_STRIP_TRAILING_WHITESPACE)
-execute_process(COMMAND ${LLVM_CONFIG} --ldflags     OUTPUT_VARIABLE LLVM_LDFLAGS     OUTPUT_STRIP_TRAILING_WHITESPACE)
-execute_process(COMMAND ${LLVM_CONFIG} --libs        OUTPUT_VARIABLE LLVM_LIBS        OUTPUT_STRIP_TRAILING_WHITESPACE)
-execute_process(COMMAND ${LLVM_CONFIG} --system-libs OUTPUT_VARIABLE LLVM_SYSTEM_LIBS OUTPUT_STRIP_TRAILING_WHITESPACE)
-
-string(REPLACE -O2 "" LLVM_CFLAGS ${LLVM_CFLAGS})
-string(REPLACE -fno-exceptions "" LLVM_CFLAGS ${LLVM_CFLAGS})
-string(REPLACE -fno-rtti "" LLVM_CFLAGS ${LLVM_CFLAGS})
-string(REPLACE -DNDEBUG "" LLVM_CFLAGS ${LLVM_CFLAGS})
-string(REPLACE -I "-isystem" LLVM_CFLAGS ${LLVM_CFLAGS})
-
-separate_arguments(LLVM_CFLAGS)
 add_definitions(${LLVM_CFLAGS})
 add_definitions(-std=c++11 -Wall -Wextra)
 add_definitions(-DQT_NO_KEYWORDS)
diff --git a/cmake/Modules/FindLLVM.cmake b/cmake/Modules/FindLLVM.cmake
new file mode 100644
index 0000000..ba2dd15
--- /dev/null
+++ b/cmake/Modules/FindLLVM.cmake
@@ -0,0 +1,32 @@
+find_program(LLVM_CONFIG NAMES llvm-config-3.5 llvm-config)
+
+if(LLVM_CONFIG)
+  execute_process(COMMAND ${LLVM_CONFIG} --version
+	OUTPUT_VARIABLE LLVM_VERSION)
+
+  if(((${LLVM_VERSION} VERSION_LESS 3.6.0)
+		AND (${LLVM_VERSION} VERSION_GREATER 3.5))
+	  OR (${LLVM_VERSION} VERSION_EQUAL 3.5))
+
+	execute_process(COMMAND ${LLVM_CONFIG} --cxxflags
+	  OUTPUT_VARIABLE LLVM_CFLAGS      OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${LLVM_CONFIG} --ldflags
+	  OUTPUT_VARIABLE LLVM_LDFLAGS     OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${LLVM_CONFIG} --libs
+	  OUTPUT_VARIABLE LLVM_LIBS        OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${LLVM_CONFIG} --system-libs
+	  OUTPUT_VARIABLE LLVM_SYSTEM_LIBS OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+	string(REPLACE -O2 "" LLVM_CFLAGS ${LLVM_CFLAGS})
+	string(REPLACE -fno-exceptions "" LLVM_CFLAGS ${LLVM_CFLAGS})
+	string(REPLACE -fno-rtti "" LLVM_CFLAGS ${LLVM_CFLAGS})
+	string(REPLACE -DNDEBUG "" LLVM_CFLAGS ${LLVM_CFLAGS})
+	string(REPLACE -I "-isystem" LLVM_CFLAGS ${LLVM_CFLAGS})
+
+	separate_arguments(LLVM_CFLAGS)
+  endif()
+endif()
+
+if(NOT DEFINED LLVM_CFLAGS)
+  message(SEND_ERROR "LLVM 3.5 required but not found")
+endif()
\ No newline at end of file
-- 
2.39.2