Re: [Qemu-trivial] [PATCH] tcg: mark tcg_out* and tcg_patch* with attribute 'unused'

[Michael Tokarev <mjt@tls.msk.ru>]

07.06.2014 21:08, Peter Maydell wrote:
> The tcg_out* and tcg_patch* functions are utility routines that may or
> may not be used by a particular backend; mark them with the 'unused'
> attribute to suppress spurious warnings if they aren't used.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> Do we want to define a QEMU_UNUSED macro in compiler.h? We don't
> seem to have done for the existing uses of this attribute in tree.
> 
>  tcg/tcg.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/tcg/tcg.c b/tcg/tcg.c
> index 2c5732d..fe55d05 100644
> --- a/tcg/tcg.c
> +++ b/tcg/tcg.c
> @@ -125,19 +125,20 @@ static TCGRegSet tcg_target_available_regs[2];
>  static TCGRegSet tcg_target_call_clobber_regs;
>  
>  #if TCG_TARGET_INSN_UNIT_SIZE == 1
> -static inline void tcg_out8(TCGContext *s, uint8_t v)

Hm. Those are already #ifdef'ed, is it not enough?  Which architectures
do not use functions which _are_ declared/defined?

But I wonder, why to bother at all?  This "static inline foo() {..}" idiom
is very common in header files, to define a function which may or may not
be used, and no compiler warns about these.

Thanks,

/mjt