Nope. The builtins not only vary between gcc versions, but they
also
have a nasty tendency to generate calls to library functions,
sometimes
libgcc functions. Hence -ffreestanding.
-ffreestanding will still generate calls to libgcc functions.
-ffreestanding doesn't disable _all_ of the C library, either.
No, it doesn't, but it does inhibit builtin functions, and so
provides a
bit more ABI stability.
Yes, Linux should definitely be compiled with -ffreestanding,
it isn't a hosted application after all ;-)
Segher
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