How to use CMake big-endian test?

[Pierre Abbat]

I don't know where to ask, but I recently converted a project to CMake as a 
result of switching to KDevelop 4, so I figured I'd ask here.

I have a project in KDevelop 4.1.0 with the following CMakeLists file:
---
project(tone12)

add_executable(tone12 tone12.cpp midi.cpp midi.h riffwave.cpp riffwave.cpp 
tonegen.cpp tonegen.h)

INCLUDE(CPack)
INCLUDE(TestBigEndian)

TEST_BIG_ENDIAN(BIGENDIAN)
---
I am starting to write the MIDI file reading routine, which requires knowing 
the endianness, as the size of chunks is stored big-endian, and I need to 
know whether to flip it. I succeeded in getting the endian test result in 
CMakeCache, but I don't know how to let the source code know what it is. How 
do I make a config.h, or the equivalent, containing the result of the test?

Pierre
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