build/cmake: Coalesce in-tree sanity checks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143730 91177308-0d34-0410-b5e6-96231b3b80d8

CMakeLists.txt

@@ -27,6 +27,11 @@ set(PACKAGE_NAME llvm)
 set(PACKAGE_STRING "${PACKAGE_NAME} ${PACKAGE_VERSION}")
 set(PACKAGE_BUGREPORT "llvmbugs@cs.uiuc.edu")
 
+# Sanity check our source directory to make sure that we are not trying to
+# generate an in-tree build (unless on MSVC_IDE, where it is ok), and to make
+# sure that we don't have any stray generated files lying around in the tree
+# (which would end up getting picked up by header search, instead of the correct
+# versions).
 if( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE )
   message(FATAL_ERROR "In-source builds are not allowed.
 CMake would overwrite the makefiles distributed with LLVM.
@@ -35,27 +40,17 @@ to this source directory as the last argument.
 This process created the file `CMakeCache.txt' and the directory `CMakeFiles'.
 Please delete them.")
 endif()
-
-string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
-
-set(LLVM_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR})
-set(LLVM_MAIN_INCLUDE_DIR ${LLVM_MAIN_SRC_DIR}/include)
-set(LLVM_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
-set(LLVM_TOOLS_BINARY_DIR ${LLVM_BINARY_DIR}/bin)
-set(LLVM_EXAMPLES_BINARY_DIR ${LLVM_BINARY_DIR}/examples)
-set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
-
 if( NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
   file(GLOB_RECURSE
     tablegenned_files_on_include_dir
-    "${LLVM_MAIN_SRC_DIR}/include/llvm/*.gen")
+    "${CMAKE_CURRENT_SOURCE_DIR}/include/llvm/*.gen")
   file(GLOB_RECURSE
     tablegenned_files_on_lib_dir
-    "${LLVM_MAIN_SRC_DIR}/lib/Target/*.inc")
+    "${CMAKE_CURRENT_SOURCE_DIR}/lib/Target/*.inc")
   if( tablegenned_files_on_include_dir OR tablegenned_files_on_lib_dir)
     message(FATAL_ERROR "Apparently there is a previous in-source build,
 probably as the result of running `configure' and `make' on
-${LLVM_MAIN_SRC_DIR}.
+${CMAKE_CURRENT_SOURCE_DIR}.
 This may cause problems. The suspicious files are:
 ${tablegenned_files_on_lib_dir}
 ${tablegenned_files_on_include_dir}
@@ -63,6 +58,15 @@ Please clean the source directory.")
   endif()
 endif()
 
+string(TOUPPER "${CMAKE_BUILD_TYPE}" uppercase_CMAKE_BUILD_TYPE)
+
+set(LLVM_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+set(LLVM_MAIN_INCLUDE_DIR ${LLVM_MAIN_SRC_DIR}/include)
+set(LLVM_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
+set(LLVM_TOOLS_BINARY_DIR ${LLVM_BINARY_DIR}/bin)
+set(LLVM_EXAMPLES_BINARY_DIR ${LLVM_BINARY_DIR}/examples)
+set(LLVM_LIBDIR_SUFFIX "" CACHE STRING "Define suffix of library directory name (32/64)" )
+
 set(LLVM_ALL_TARGETS
   ARM
   CBackend