Fix tic6x-uclinux GDBserver build failure

  I can't find a c6x-uclinux c++ compiler, so I use my host g++ to build
tic6x-uclinux GDBserver, and find the following build failures.  They are
not target specific, so I believe they are real errors.  This patch fixes
them.

../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:313:34: error: invalid
conversion from 'void*' to 'tic6x_register*' [-fpermissive]
   union tic6x_register *regset = buf;
                                  ^
../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c: In function 'void tic6x_store_gregset(regcache*, const void*)':
../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:324:40: error: invalid
conversion from 'const void*' to 'const tic6x_register*' [-fpermissive]
   const union tic6x_register *regset = buf;
                                        ^

../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c: At global scope:
../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:359:28: error: redefinition of 'usrregs_info tic6x_usrregs_info'
 static struct usrregs_info tic6x_usrregs_info =
                            ^
../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:186:28: note: 'usrregs_info tic6x_usrregs_info' previously declared here
 static struct usrregs_info tic6x_usrregs_info;
                            ^

gdb/gdbserver:

2017-11-15  Yao Qi  <yao.qi@linaro.org>

	* linux-tic6x-low.c (tic6x_fill_gregset): Cast buf.
	(tic6x_store_gregset): Likewise.
	(tic6x_usrregs_info): Move it up.
---
 gdb/gdbserver/linux-tic6x-low.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)
  

On 2017-11-15 12:20, Yao Qi wrote:
> I can't find a c6x-uclinux c++ compiler, so I use my host g++ to build
> tic6x-uclinux GDBserver, and find the following build failures.  They 
> are
> not target specific, so I believe they are real errors.  This patch 
> fixes
> them.
> 
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:313:34: error: invalid
> conversion from 'void*' to 'tic6x_register*' [-fpermissive]
>    union tic6x_register *regset = buf;
>                                   ^
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c: In function 'void
> tic6x_store_gregset(regcache*, const void*)':
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:324:40: error: invalid
> conversion from 'const void*' to 'const tic6x_register*' [-fpermissive]
>    const union tic6x_register *regset = buf;
>                                         ^
> 
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c: At global scope:
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:359:28: error:
> redefinition of 'usrregs_info tic6x_usrregs_info'
>  static struct usrregs_info tic6x_usrregs_info =
>                             ^
> ../binutils-gdb/gdb/gdbserver/linux-tic6x-low.c:186:28: note:
> 'usrregs_info tic6x_usrregs_info' previously declared here
>  static struct usrregs_info tic6x_usrregs_info;
>                             ^
> 
> gdb/gdbserver:
> 
> 2017-11-15  Yao Qi  <yao.qi@linaro.org>
> 
> 	* linux-tic6x-low.c (tic6x_fill_gregset): Cast buf.
> 	(tic6x_store_gregset): Likewise.
> 	(tic6x_usrregs_info): Move it up.
> ---
>  gdb/gdbserver/linux-tic6x-low.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/gdb/gdbserver/linux-tic6x-low.c 
> b/gdb/gdbserver/linux-tic6x-low.c
> index 7a32f7e..6dda52e 100644
> --- a/gdb/gdbserver/linux-tic6x-low.c
> +++ b/gdb/gdbserver/linux-tic6x-low.c
> @@ -182,8 +182,11 @@ tic6x_sw_breakpoint_from_kind (int kind, int 
> *size)
>    return (const gdb_byte *) &tic6x_breakpoint;
>  }
> 
> -/* Forward definition.  */
> -static struct usrregs_info tic6x_usrregs_info;
> +static struct usrregs_info tic6x_usrregs_info =
> +  {
> +    TIC6X_NUM_REGS,
> +    NULL, /* Set in tic6x_read_description.  */
> +  };
> 
>  static const struct target_desc *
>  tic6x_read_description (void)
> @@ -310,7 +313,7 @@ tic6x_supply_register (struct regcache *regcache, 
> int regno,
>  static void
>  tic6x_fill_gregset (struct regcache *regcache, void *buf)
>  {
> -  union tic6x_register *regset = buf;
> +  auto regset = static_cast<union tic6x_register *> (buf);
>    int i;
> 
>    for (i = 0; i < TIC6X_NUM_REGS; i++)
> @@ -321,7 +324,7 @@ tic6x_fill_gregset (struct regcache *regcache, void 
> *buf)
>  static void
>  tic6x_store_gregset (struct regcache *regcache, const void *buf)
>  {
> -  const union tic6x_register *regset = buf;
> +  const auto regset = static_cast<const union tic6x_register *> (buf);
>    int i;
> 
>    for (i = 0; i < TIC6X_NUM_REGS; i++)
> @@ -356,12 +359,6 @@ static struct regsets_info tic6x_regsets_info =
>      NULL, /* disabled_regsets */
>    };
> 
> -static struct usrregs_info tic6x_usrregs_info =
> -  {
> -    TIC6X_NUM_REGS,
> -    NULL, /* Set in tic6x_read_description.  */
> -  };
> -
>  static struct regs_info regs_info =
>    {
>      NULL, /* regset_bitmap */

Looks good to me.  The cast stuff is probably broken since we have 
switched to C++, so it gives an idea about the activity of this port.

Simon
  

Simon Marchi <simon.marchi@polymtl.ca> writes:

> Looks good to me.  The cast stuff is probably broken since we have
> switched to C++, so it gives an idea about the activity of this port.

I pushed it in.