On 10 May 2018 at 15:37, Richard Henderson <r...@twiddle.net> wrote: > On 05/10/2018 07:36 AM, Peter Maydell wrote: >> Some versions of gcc produce a spurious warning if the result of >> __atomic_compare_echange_n() is not used and the type involved >> is a signed 8 bit value: >> error: value computed is not used [-Werror=unused-value] >> This has been seen on at least >> gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609 >> >> Work around this by using an explicit cast to void to indicate >> that we don't care about the return value. >> >> We don't currently use our atomic_cmpxchg() macro on any signed >> 8 bit types, but the upcoming support for the Arm v8.1-Atomics >> will require it. >> >> Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> >> --- >> Sending out my workaround as an actual patch. If this is OK I'll >> put in via target-arm.next as it's a dependency for the v8.1-atomics >> series. >> >> include/qemu/atomic.h | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) > > Reviewed-by: Richard Henderson <richard.hender...@linaro.org>
Thanks. Do we care about trying to follow up on the gcc side to find out if this is a definitely-fixed bug? -- PMM
