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, 2 insertions, 0 deletions

diff --git a/Modules/CheckTypeSize.cmake b/Modules/CheckTypeSize.cmake
index 2eb1224a1c..9f43249359 100644
--- a/Modules/CheckTypeSize.cmake
+++ b/Modules/CheckTypeSize.cmake
@@ -13,6 +13,7 @@
 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
 
 MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
+  IF(NOT DEFINED ${VARIABLE})
   SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS 1)
   IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
     SET(CHECK_TYPE_SIZE_TYPE "${TYPE}")
@@ -65,4 +66,5 @@ MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
     ENDIF(HAVE_${VARIABLE})
   ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
   SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS )
+  ENDIF(NOT DEFINED ${VARIABLE})
 ENDMACRO(CHECK_TYPE_SIZE)