[CMake] Wrong CMAKE_SYSTEM_NAME handling

[Marco Milanese]

Hi,

I'm trying to setup a cross compile CMakeLists.txt. My target is a embedded
ARM core.
This is my CMakeLists.txt <https://gist.github.com/a1849d9b5ff02606e860>  .

The linker script seems wrong:
mm7 at pc5:~/test/cmake/build$ cat CMakeFiles/target.dir/link.txt
arm-none-eabi-g++       CMakeFiles/target.dir/test.cpp.o  -o target
-rdynamic 

I can't understand why is "-rdynamic" appended. It should be appended only
if "CMAKE_SYSTEM_NAME"=Linux
(https://github.com/Kitware/CMake/blob/4811915367cc23e68e2171b83509b8a382ff1941/Modules/Platform/Linux-GNU.cmake#L24).

Is this a CMake bug or am I making some mistakes? Thank you

Marco



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