Re: [PATCH 1/2] disas/arm-a64.cc: Fix build error

[Miroslav Rezanina]

On Sat, Mar 20, 2021 at 12:18:54PM +0800, Gavin Shan wrote:
> This fixes the following build error with gcc v11.0.0:
> 
>   # gcc --version
>   gcc (GCC) 11.0.0 20210210 (Red Hat 11.0.0-0)
> 
>   [969/2604] Compiling C++ object libcommon.fa.p/disas_arm-a64.cc.o
>   FAILED: libcommon.fa.p/disas_arm-a64.cc.o
>     :
>   In file included from /usr/include/glib-2.0/glib/gmacros.h:241,
>                    from /usr/lib64/glib-2.0/include/glibconfig.h:9,
>                    from /usr/include/glib-2.0/glib/gtypes.h:32,
>                    from /usr/include/glib-2.0/glib/galloca.h:32,
>                    from /usr/include/glib-2.0/glib.h:30,
>                    from 
> /home/gavin/sandbox/qemu.main/include/glib-compat.h:32,
>                    from 
> /home/gavin/sandbox/qemu.main/include/qemu/osdep.h:126,
>                    from ../disas/arm-a64.cc:21:
>   /usr/include/c++/11/type_traits:56:3: error: template with C linkage
>      56 |   template<typename _Tp, _Tp __v>
>         |   ^~~~~~~~
>   ../disas/arm-a64.cc:20:1: note: ‘extern "C"’ linkage started here
>      20 | extern "C" {
>         | ^~~~~~~~~~
> 
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
>  disas/arm-a64.cc | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/disas/arm-a64.cc b/disas/arm-a64.cc
> index 9fa779e175..8545c04038 100644
> --- a/disas/arm-a64.cc
> +++ b/disas/arm-a64.cc
> @@ -17,13 +17,13 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include "vixl/a64/disasm-a64.h"
> +
>  extern "C" {
>  #include "qemu/osdep.h"
>  #include "disas/dis-asm.h"
>  }
>  
> -#include "vixl/a64/disasm-a64.h"
> -
>  using namespace vixl;
>  
>  static Decoder *vixl_decoder = NULL;
> -- 
> 2.23.0
> 
> 

This error occurs when c++ compiler is used. With the fix, build pass.

Reviewed-by: Miroslav Rezanina <mrezanin@redhat.com>