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Date: Tue, 13 Oct 2026 08:46:21 +0200
From: Sebastian Ramacher <sramacher@debian.org>
To: =?utf-8?B?5byg5aic?= <zhangna@loongson.cn>,
	1150735-done@bugs.debian.org
Subject: Re: Bug#1150735: libvbz-hdf-plugin: FTBFS on loong64 with GCC 15,
 please rebuild on loong64 with GCC 16 (GCC 16 is now default)
Message-ID: <as3Tve35fvRG_Vg3@ramacher.at>
References: <747ea793.6ea6.1a1333be8a3.Coremail.zhangna@loongson.cn>
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On 2026-10-13 11:08:46 +0800, 张娜 wrote:
> Package: libvbz-hdf-plugin
> Version: 1.0.13-1
> Severity: normal
> Tags: FTBFS sid
> User: debian-loongarch@lists.debian.org
> Usertags: loong64
> 
> Dear Maintainer,
> 
> libvbz-hdf-plugin 1.0.13-1 fails to build from source on loong64 with GCC 15 due to a false positive -Warray-bounds warning promoted to an error by -Werror.
> 
> Build log:
> https://buildd.debian.org/status/fetch.php?pkg=libvbz-hdf-plugin&arch=loong64&ver=1.0.13-1&stamp=1782758258&raw=0
> 
> The error:
>   vbz/v0/vbz_streamvbyte_impl.h:88:23: error:
>     'void* __builtin_memcpy(void*, const void*, long unsigned int)'
>     offset [0, 3] is out of the bounds [0, 0] [-Werror=array-bounds=]
>      88 |             output[i] = input[i];
> 
> This is a known GCC 15 false positive in the -Warray-bounds check at -O3. The code itself is correct.
> GCC 16, which is now available in sid, fixes this false positive. I have verified that libvbz-hdf-plugin builds successfully on loong64 with GCC 16.
> Could you please rebuild this package on loong64? No source changes are needed. This is important because many packages on loong64 depend on libvbz-hdf-plugin, and they are currently blocked by this build failure.

In that case you'd want that the build is retried. This is handled via
give-back for wanna-build. See
https://release.debian.org/wanna-build.html

Given back.

Cheers
-- 
Sebastian Ramacher]