Bug#1125715: diet-ng: FTBFS on arm64: Unable to detect linker for compiler `ldc2 -L=--version /tmp/tmpp57y3ut8.d -L=-z -L=relro -mbranch-protection=standard -release -wi -g -O2`

Hi!

On Fri, 2026-01-16 at 17:58:40 +0100, Emanuele Rocca wrote:
> Control: reassign -1 dpkg-dev
> Control: retitle -1 dpkg-buildflags adds branch-protection to LDFLAGS
> 
> On 2026-01-16 04:57, Sebastian Ramacher wrote:
> > ../meson.build:1:0: ERROR: Unable to detect linker for compiler `ldc2 -L=--version /tmp/tmpp57y3ut8.d -L=-z -L=relro -mbranch-protection=standard -release -wi -g -O2`
> > stdout: 
> > stderr: ldc2: Unknown command line argument '-mbranch-protection=standard'.  Try: 'ldc2 --help'
> > ldc2: Did you mean '--fcf-protection=standard'?
> 
> It seems that dpkg-buildflags erroneously started adding to LDFLAGS
> -mbranch-protection=standard, while that is not a linker argument.

Hmm, according to #1115292 (commit cdf5f5da0e0cb6f9f4d51e93fd9583bd578c252f)
this is needed to avoid warnings from the compiler. Was that analysis
wrong somehow?

At this point all options seem pretty bad to me. :/

Thanks,
Guillem