[libvirt] [PATCH] m4: Disable -Wdisabled-optimization
Daniel P. Berrange
berrange at redhat.com
Tue Sep 5 16:02:51 UTC 2017
On Tue, Sep 05, 2017 at 05:32:03PM +0200, Andrea Bolognani wrote:
> After b4f7793ce269, qemuxml2xmltest has apparently become big enough
> to trigger a compilation error on aarch64:
>
> CC qemuxml2xmltest.o
> qemuxml2xmltest.c: In function 'mymain':
> qemuxml2xmltest.c:1216:1: error: const/copy propagation disabled: 4361 basic blocks and 99285 registers [-Werror=disabled-optimization]
> }
> ^
> qemuxml2xmltest.c:1216:1: error: PRE disabled: 4361 basic blocks and 99285 registers [-Werror=disabled-optimization]
> qemuxml2xmltest.c:1216:1: error: const/copy propagation disabled: 4361 basic blocks and 99285 registers [-Werror=disabled-optimization]
> qemuxml2xmltest.c:1216:1: error: const/copy propagation disabled: 4361 basic blocks and 99285 registers [-Werror=disabled-optimization]
>
> However, as the GCC documentation states, this warning is not really
> caused by issues in our code, so it makes sense to disable it.
>
> Signed-off-by: Andrea Bolognani <abologna at redhat.com>
> ---
> m4/virt-compile-warnings.m4 | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/m4/virt-compile-warnings.m4 b/m4/virt-compile-warnings.m4
> index e8f135126..f18a08a8f 100644
> --- a/m4/virt-compile-warnings.m4
> +++ b/m4/virt-compile-warnings.m4
> @@ -64,6 +64,11 @@ AC_DEFUN([LIBVIRT_COMPILE_WARNINGS],[
> # Several conditionals expand the same on both branches
> # depending on the particular platform/architecture
> dontwarn="$dontwarn -Wduplicated-branches"
> + # > This warning does not generally indicate that there is anything wrong
> + # > with your code; it merely indicates that GCC's optimizers are unable
> + # > to handle the code effectively.
> + # Source: https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
> + dontwarn="$dontwarn -Wdisabled-optimization"
>
> # gcc 4.2 treats attribute(format) as an implicit attribute(nonnull),
> # which triggers spurious warnings for our usage
Reviewed-by: Daniel P. Berrange <berrange at redhat.com>
Regards,
Daniel
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