Package: Thunderbird
Version: 140.11.0esr-1~deb13u1

Trixie
6.12.88+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.88-1 (2026-05-15) x86_64 
GNU/Linux

With standard manner, I am building

thunderbird_140.11.0esr-1~deb13u1_amd64.deb

After doing the following (summary):
$ apt-get source thunderbird
# apt build-dep thunderbird
$ dpkg-buildpackage -b -us -uc -j1

I had the error like this:

***

error: linking with `/.../thunderbird-140.11.0esr/build/cargo-linker` failed: 
exit status: 1 |

  = note: some arguments are omitted. use `--verbose` to show all linker 
arguments
  = note: ld.lld: error: unknown argument '--reduce-memory-overheads'
          clang: error: linker command failed with exit code 1 (use -v to see 
invocation)

error: could not compile `proc-macro2` (build script) due to 1 previous error

***

Looks better to disable the flag --reduce-memory-overheads
with clang (like firefox-esr)

I already made the patch and am going to send a pull request at Salsa.

Taro

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