[CMake] Does the echo command use the system shell?

[Óscar Fuentes]

Andreas Pakulat <apaku at gmx.de> writes:

[snip]

> add_custom_command( OUTPUT build.h
>                     COMMAND cmake -E echo \"\#define FOO \\"bar\\"\" >build.h )

Well, it even makes sense, although it is not immediately
obvious. Thanks!

> You can easily see your mistake by running (n)make VERBOSE=1 to see the
> actual cmake -E execution.

IMHO if "echo" creates different output for the same literal string on
different platforms, that's a problem.