Bug#1080323: gnome-snapshot: FTBFS on armel, armhf: LLVM runs out of memory

[Matthias Geiger]

02.09.2024 10:57:26 Simon McVittie <smcv at debian.org>:

> Source: gnome-snapshot
> Version: 47~beta-1
> Severity: serious
> Tags: experimental ftbfs
> Justification: fails to build from source (but built successfully in the past)
> User: debian-arm at lists.debian.org
> Usertags: armel armhf
> X-Debbugs-CC: debian-arm at lists.debian.org, debian-rust at lists.debian.org
> 
> The new version of gnome-snapshot in experimental FTBFS on armel and
> armhf with this error message:
> 
>>    Compiling snapshot v46.0.0 (/<<PKGBUILDDIR>>)
>>      Running [a long rustc command]
>> rustc-LLVM ERROR: out of memory
>> Allocation failed
>> error: could not compile `snapshot` (bin "snapshot")
> 
> Presumably this is actually running out of address space available to a
> single process, which is 2G on 32-bit if I understand correctly.
> This probably affects the other 32-bit architectures equally, but some
> build-dependencies are missing on i386 and on all 32-bit -ports
> architectures, so we cannot yet confirm or deny that.
Yes. This happened for glycin-loaders too. The " solution" here is to disable lto on armel/hf.
> 
> 
> Is there anything that can be done in the rustc/cargo options to reduce
> memory consumption, like perhaps reducing optimizations or debug symbol
> coverage?
> 
> Whether this can be fixed will affect the decision being made in #1080153
> about cheese vs. gnome-snapshot in the src:meta-gnome3 metapackages. If
> gnome-snapshot becomes unavailable on armel/armhf/i386, we'll have to do
> architecture-specific removals; but then if we decide that gnome-snapshot
> is preferred on 64-bit architectures, we will need to either continue to
> have cheese (and therefore clutter-1.0, which is unmaintained upstream)
> available for at least the 32-bit architectures, or omit webcam
> integration from the metapackages on 32-bit (or not provide the metapackages
> at all on 32-bit, but that will require coordination with the release team).
> 
>     smcv


Though being on VAC I can commit a similar fix like I did for glycin-loaders. Disabling lto should be enough for now. Note that it's currently an ugly hack since passing build options to the cargo wrapper is broken atm.

best,

werdahias