ENH: merge CMake-CrossCompileBasic to HEAD

-add a RESULT_VARIABLE to INCLUDE()
-add CMAKE_TOOLCHAIN_FILE for specifiying your (potentially crosscompiling) toolchain
-have TRY_RUN() complain if you try to use it in crosscompiling mode (which were compiled but cannot run on this system)
-use CMAKE_EXECUTABLE_SUFFIX in TRY_RUN(), probably TRY_RUN won't be able to
run the executables if they have a different suffix because they are
probably crosscompiled, but nevertheless it should be able to find them
-make several cmake variables presettable by the user: CMAKE_C/CXX_COMPILER, CMAKE_C/CXX_OUTPUT_EXTENSION, CMAKE_SYSTEM_NAME, CMAKE_SYSTEM_INFO_FILE
-support prefix for GNU toolchains (arm-elf-gcc, arm-elf-ar, arm-elf-strip etc.)
-move ranlib on OSX from the file command to a command in executed in cmake_install.cmake
-add support for stripping during install in cmake_install.cmake
-split out cl.cmake from Windows-cl.cmake, first (very incomplete) step to support MS crosscompiling tools
-remove stdio.h from the simple C program which checks if the compiler works, since this may not exist for some embedded platforms
-create a new CMakeFindBinUtils.cmake which collects the search fro ar, ranlib, strip, ld, link, install_name_tool and other tools like these
-add support for CMAKE_FIND_ROOT_PATH for all FIND_XXX commands, which is a
list of directories which will be prepended to all search directories, right
now as a cmake variable, turning it into a global cmake property may need
some more work
-remove cmTestTestHandler::TryExecutable(), it's unused
-split cmFileCommand::HandleInstall() into slightly smaller functions

Alex

1 files changed, 17 insertions, 13 deletions

diff --git a/Modules/CMakeCXXInformation.cmake b/Modules/CMakeCXXInformation.cmake
index ef1b07e..d966f12 100644
--- a/Modules/CMakeCXXInformation.cmake
+++ b/Modules/CMakeCXXInformation.cmake
@@ -3,19 +3,23 @@
 # It also loads the available platform file for the system-compiler
 # if it exists.
 
-GET_FILENAME_COMPONENT(CMAKE_BASE_NAME ${CMAKE_CXX_COMPILER} NAME_WE)
-# since the gnu compiler has several names force g++
-IF(CMAKE_COMPILER_IS_GNUCXX)
-  SET(CMAKE_BASE_NAME g++)
-ENDIF(CMAKE_COMPILER_IS_GNUCXX)
-IF(CMAKE_CXX_COMPILER_ID)
-  IF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX.cmake)
-    SET(CMAKE_BASE_NAME ${CMAKE_CXX_COMPILER_ID}-CXX)
-  ENDIF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX.cmake)
-ENDIF(CMAKE_CXX_COMPILER_ID)
-SET(CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE
-  ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}.cmake)
-INCLUDE(Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME} OPTIONAL)
+IF(NOT CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE)
+  GET_FILENAME_COMPONENT(CMAKE_BASE_NAME ${CMAKE_CXX_COMPILER} NAME_WE)
+  # since the gnu compiler has several names force g++
+  IF(CMAKE_COMPILER_IS_GNUCXX)
+    SET(CMAKE_BASE_NAME g++)
+  ENDIF(CMAKE_COMPILER_IS_GNUCXX)
+  IF(CMAKE_CXX_COMPILER_ID)
+    IF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX.cmake)
+      SET(CMAKE_BASE_NAME ${CMAKE_CXX_COMPILER_ID}-CXX)
+    ENDIF(EXISTS ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_CXX_COMPILER_ID}-CXX.cmake)
+  ENDIF(CMAKE_CXX_COMPILER_ID)
+  SET(CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE
+    ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}.cmake)
+ENDIF(NOT CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE)
+
+INCLUDE(${CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE} OPTIONAL)
+
 # This should be included before the _INIT variables are
 # used to initialize the cache.  Since the rule variables 
 # have if blocks on them, users can still define them here.