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Re: [Xen-devel] Failing to build test-cpu-policy.c with GCC9


  • To: Dario Faggioli <dfaggioli@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 26 Jul 2019 02:06:22 +0100
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On 26/07/2019 01:50, Dario Faggioli wrote:
> Hey, Andy,
>
> openSUSE Tumbleweed has: gcc version 9.1.1 20190703
>
> And this fails to build test-cpu-policy.c, like this:
>
> test-cpu-policy.c: In function ‘main’:
> test-cpu-policy.c:64:18: error: ‘%.12s’ directive argument is not a 
> nul-terminated string [-Werror=format-overflow=]
>    64 |             fail("  Test '%.12s', expected vendor %u, got %u\n",
>       |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> test-cpu-policy.c:20:12: note: in definition of macro ‘fail’
>    20 |     printf(fmt, ##__VA_ARGS__);                 \
>       |            ^~~
> test-cpu-policy.c:64:27: note: format string is defined here
>    64 |             fail("  Test '%.12s', expected vendor %u, got %u\n",
>       |                           ^~~~~
> test-cpu-policy.c:44:7: note: referenced argument declared here
>    44 |     } tests[] = {
>       |  
>
> Even just doing something like below, seems to fix it for me, but there
> probably are better ways...

It's a compiler bug, but I haven't had time to file a ticket yet.

The claim in the warning is false.

~Andrew

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