Re: [Xen-devel] Re: c/s 23253:a3db6b91f32d causes build failure with gcc 4.4.3-4ubuntu5

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

Unfortunately not.

Looks like we could either make libxl__domain_bios() a #define (not
tested), or make the argument "%s" (which seems to work, patch
attached).

Adding a format string of just a string seems kind of dumb, but I
don't think this is a really hot path...

 -George


On Fri, May 6, 2011 at 1:33 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:
> On Fri, 2011-05-06 at 12:14 +0100, George Dunlap wrote:
>
>> The line in question is:
>>     libxl__xs_write(gc, XBT_NULL, libxl__sprintf(gc, "%s/bios", path),
>>                     libxl__domain_bios(gc, info));
>>
>> Looks like libxl__xs_write() is expecting the 4th argument to be a
>> format string...?
>
> Yes, and hence it needs to be a const char * not a char *, so we should
> change both libxl__domain_bios and libxl__xs_write I think.
>
> Does this help? It works for me, but my compiler doesn't appear to
> complain in this way...
>
> Ian.
>
> 8<-------------------------------------------
>
> # HG changeset patch
> # User Ian Campbell <ian.campbell@xxxxxxxxxx>
> # Date 1304685175 -3600
> # Node ID 4e5487962178e7affd7d7d0341a90dde8c60915e
> # Parent  faca1c90188e536eb0f02992c766d06759be376f
> libxl: libxl__xs_write format string should be const.
>
> George Dunlap reports that gcc 4.4.3 complains:
>        libxl_dm.c: In function libxl__create_device_mode:
>        libxl_dm.c:776: error: format not a string literal and no format 
> arguments
> And indeed the format argument here is a char * from libxl__domain_bios().
>
> Make the argument to libxl__xs_write a const char * and change
> libxl__domain_bios to return a const char too.
>
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
>
> diff -r faca1c90188e -r 4e5487962178 tools/libxl/libxl_dm.c
> --- a/tools/libxl/libxl_dm.c    Fri May 06 13:14:24 2011 +0100
> +++ b/tools/libxl/libxl_dm.c    Fri May 06 13:32:55 2011 +0100
> @@ -68,12 +68,12 @@ const char *libxl__domain_device_model(l
>     return dm;
>  }
>
> -static char *libxl__domain_bios(libxl__gc *gc,
> +static const char *libxl__domain_bios(libxl__gc *gc,
>                                 libxl_device_model_info *info)
>  {
>     switch (info->device_model_version) {
> -    case 1: return libxl__strdup(gc, "rombios");
> -    case 2: return libxl__strdup(gc, "seabios");
> +    case 1: return "rombios";
> +    case 2: return "seabios";
>     default:return NULL;
>     }
>  }
> diff -r faca1c90188e -r 4e5487962178 tools/libxl/libxl_internal.h
> --- a/tools/libxl/libxl_internal.h      Fri May 06 13:14:24 2011 +0100
> +++ b/tools/libxl/libxl_internal.h      Fri May 06 13:32:55 2011 +0100
> @@ -153,7 +153,7 @@ _hidden char **libxl__xs_kvs_of_flexarra
>  _hidden int libxl__xs_writev(libxl__gc *gc, xs_transaction_t t,
>                     char *dir, char **kvs);
>  _hidden int libxl__xs_write(libxl__gc *gc, xs_transaction_t t,
> -                   char *path, char *fmt, ...) PRINTF_ATTRIBUTE(4, 5);
> +                   char *path, const char *fmt, ...) PRINTF_ATTRIBUTE(4, 5);
>    /* Each fn returns 0 on success.
>     * On error: returns -1, sets errno (no logging) */
>
> diff -r faca1c90188e -r 4e5487962178 tools/libxl/libxl_xshelp.c
> --- a/tools/libxl/libxl_xshelp.c        Fri May 06 13:14:24 2011 +0100
> +++ b/tools/libxl/libxl_xshelp.c        Fri May 06 13:32:55 2011 +0100
> @@ -69,7 +69,7 @@ int libxl__xs_writev(libxl__gc *gc, xs_t
>  }
>
>  int libxl__xs_write(libxl__gc *gc, xs_transaction_t t,
> -                   char *path, char *fmt, ...)
> +                   char *path, const char *fmt, ...)
>  {
>     libxl_ctx *ctx = libxl__gc_owner(gc);
>     char *s;
>
>
>
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Attachment: build-fix.diff
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