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Subject: Re: [Qemu-devel] -Werror=tautological-compare error with
 -save-temps on fedora 24 gcc 6.2.1
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To: Anand J <anand.indukala@gmail.com>, qemu-devel@nongnu.org



On 10/16/2016 03:08 AM, Anand J wrote:
> Hi,
>
> I'm using gcc 6.2.1 for compiling qemu with following options in Fedora=
 24
>
> ../../../configure --enable-debug --extra-cflags=3D"-save-temps"
> make
>
> and getting following error.
>
> *  CC      ui/gtk.o*
> *qemu/ui/gtk.c: In function =E2=80=98gd_map_keycode=E2=80=99:*
> *qemu/ui/gtk.c:1030:21: error: self-comparison always evaluates to true
> [-Werror=3Dtautological-compare]*
> *     } else if (GDK_IS_X11_DISPLAY(dpy) && gdk_keycode < 158) {*
> *                     ^~*
> *qemu/ui/gtk.c: In function =E2=80=98gd_set_keycode_type=E2=80=99:*
> *qemu/ui/gtk.c:2123:18: error: self-comparison always evaluates to true
> [-Werror=3Dtautological-compare]*
> *     if (GDK_IS_X11_DISPLAY(display)) {*
> *                  ^~*
> *cc1: all warnings being treated as errors*
> *qemu/rules.mak:60: recipe for target 'ui/gtk.o' failed*
> *make: *** [ui/gtk.o] Error 1*
>
>
>
> Build works fine without -save-temps options. Does anybody know how to =
fix
> this?
>
> Thanks,
> Anand
>

Reminds me of a CCACHE + clang problem. Try disabling ccache to see if=20
that improves matters for you. Otherwise, I'd just start disabling=20
errors as long as you want to be using the save temps option with=20
-Wno-tautological-compare for now.