Bug#1124022: alicevision: Please disable LTO to fix FTBFS

[Sudip Mukherjee]

Looks like its happening because gcc-12 is being used to build this package
whereas the other dependencies have been built with gcc-15.
The comment in debian/control explains why gcc-12 is needed.

If you want to enable LTO in Debian builds to reproduce the same failure
then try this patch.

diff -Nru alicevision-3.3.1+repack/debian/rules
alicevision-3.3.1+repack/debian/rules
--- alicevision-3.3.1+repack/debian/rules       2025-11-27
01:27:11.000000000 +0000
+++ alicevision-3.3.1+repack/debian/rules       2025-12-26
18:42:45.000000000 +0000
@@ -1,7 +1,7 @@
 #!/usr/bin/make -f
 # -*- makefile -*-

-export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all optimize=+lto

 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
--

You can read more about LTO in Debian at
https://wiki.debian.org/ToolChain/LTO

-- 
Regards
Sudip



On Fri, 26 Dec 2025 at 18:17, Dima Kogan <dkogan at debian.org> wrote:

> Thanks for the fix. I'm building the new package for Debian right now.
> Do you know any details of how LTO is supposed to work in a distro? Will
> we ever be able to turn this back on?
>


-- 
Regards
Sudip
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