[En-Nut-Discussion] Newlib version dependent defnition of unsetenv

[Ole Reinhardt]

Hi all,

I just compiled a new gnu-arm toolchain with newlib 1.17.

Unfortunatly newlib 1.17 defines the function unsetenv with return type
int, former versions had return type void and so it is implemented in
nut/crt/setenv.c

So when compiling NutOS with the new toolchain, it results in an invalid
redeclaration of unsetenv.

Btw: The version returning int is the "standard".

So I'd like to make a descision on compile time if newlib is < 1.17 or
newer. Any Idea for that? Using define _NEWLIB_VERSION is quite
uncomfortable, as it is defined as a string.

Regards,

Ole Reinhardt

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