[CMake] trouble with cmake 2.6-patch 0 cross compiling.

[Bill Hoffman]

Phil Pellouchoud wrote:
> I waited for a while to get this e-mail through, but it didn't seem like it took - trying again.
> 
It took, I have two copies...

> ----
> 
> Hi.
> 
> I've got cmake 2.6-patch 0 installed and I'm trying to get a simple (helloworld.cpp) compiled and built on a linux system.
> 
> My toolchain file looks like this:
> 
> -- toolchain.cmake --
> SET( CMAKE_SYSTEM_NAME foobar )
> SET( CMAKE_SYST EM_VERSION 1 )
> SET( CMAKE_SYSTEM_PROCESSOR arm-foo )
> SET( CMAKE_SYSTEM_C_COMPILER /absolute/path/to/compiler )
> SET( CMAKE_SYSTEM_CXX_COMPILER /absolute/path/to/compiler )
> SET( CMAKE_FIND_ROOT_PATH /absolute/path/to/compiler/tools )
> 
> SET( CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER )
> SET( CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY )
> SET( CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY )
> 
> My CMakeLists.txt file looks like this:
> -- CMakeLists.txt --
> PROJECT( helloworld )
> CMAKE_MINIMUM_REQUIRED( VERSION 2.6 )
> ADD_EXECUTABLE( helloworld helloworld.cpp )
> 
> My "Platform/foobar.cmake" exists, but is empty.
> 
> My cmake command looks like this:
> $ cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake ..
> 
> That works without any error messages.  I can do a "make" and it builds the program, but I am able to run it - which I shouldn't be able to do.  Just to be sure, I manually compiled helloworld.cpp (without cmake) and when I tried to execute it, it rightfully detected the binary was not compatible.
> 
> Furthermore, when I looked at CMakeCache.txt, I see
> CMAKE_C_COMPILER:FILEPATH=/usr/bin/gcc
> 
> Any help would be greatly appreciated.
> 
> Thanks.
> 
> -phil
> 
> p.s. I did first search the mailing lists and I consulted http://www.cmake.org/Wiki/CMake_Cross_Compiling#The_toolchain_file first as well.
> 
> Keywords: cmake, 2.6, cross compiling, linux, arm, toolchain

Alex would be the best to answer.   Some obvious things...  Did you 
start with a clean build tree?

-Bill