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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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- Delivery-date: Fri, 26 Jul 2019 01:06:35 +0000
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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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