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Re: [PATCH] Only compile the hypervisor with -Wdeclaration-after-statement
- To: Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 6 Dec 2023 11:12:23 +0000
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- Cc: Julien Grall <jgrall@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>, Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>, Quan Xu <quan.xu0@xxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Alexander Kanavin <alex@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 06 Dec 2023 11:12:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06/12/2023 8:52 am, Jan Beulich wrote:
> On 05.12.2023 19:32, Julien Grall wrote:
>> From: Julien Grall <jgrall@xxxxxxxxxx>
>>
>> Right now, all tools and hypervisor will be complied with the option
>> -Wdeclaration-after-statement. While most of the code in the hypervisor
>> is controlled by us, for tools we may import external libraries.
>>
>> The build will fail if one of them are using the construct we are
>> trying to prevent. This is the case when building against Python 3.12
>> and Yocto:
>>
>> | In file included from
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/Python.h:44,
>> | from xen/lowlevel/xc/xc.c:8:
>> |
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/object.h:
>> In function 'Py_SIZE':
>> |
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/object.h:233:5:
>> error: ISO C90 forbids mixed declarations and code
>> [-Werror=declaration-after-statement]
>> | 233 | PyVarObject *var_ob = _PyVarObject_CAST(ob);
>> | | ^~~~~~~~~~~
>> | In file included from
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/Python.h:53:
>> |
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/cpython/longintrepr.h:
>> In function '_PyLong_CompactValue':
>> |
>> /srv/storage/alex/yocto/build-virt/tmp/work/core2-64-poky-linux/xen-tools/4.17+stable/recipe-sysroot/usr/include/python3.12/cpython/longintrepr.h:121:5:
>> error: ISO C90 forbids mixed declarations and code
>> [-Werror=declaration-after-statement]
>> | 121 | Py_ssize_t sign = 1 - (op->long_value.lv_tag &
>> _PyLong_SIGN_MASK);
>> | | ^~~~~~~~~~
>> | cc1: all warnings being treated as errors
>>
>> Looking at the tools directory, a fair few directory already add
>> -Wno-declaration-after-statement to inhibit the default behavior.
>>
>> We have always build the hypervisor with the flag, so for now remove
>> only the flag for anything but the hypervisor. We can decide at later
>> time whether we want to relax.
>>
>> Also remove the -Wno-declaration-after-statement in some subdirectory
>> as the flag is now unnecessary.
> With all these removals, don't you need to add the option centrally
> somewhere? Or else are you sure that no compiler version, including
> distro-customized ones, would ever come with the warning enabled by
> default?
declaration-after-statement being permitted is covered by the -std we
choose.
No distro is plausibly going to ship a compiler which takes -std=gnu99
and has declaration-after-statement forced off if in that configuration.
~Andrew
|
