Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
     - building deb package with dpkg-buildpackage and clang
     - hardcoded -ffat-lto-objects cc flag in scripts/Dpkg/Vendor/Debian.pm
https://git.dpkg.org/git/dpkg/dpkg.git/tree/scripts/Dpkg/Vendor/Debian.pm#n451

   * What exactly did you do (or not do) that was effective (or ineffective)?
	 CC=clang dpkg-buildpackage ...

   * What was the outcome of this action?
     clang: warning: optimization flag '-ffat-lto-objects' is not supported [-Wignored-optimization-argument]

   * What outcome did you expect instead?
     not sorting out rare flags specific to one compiler
     (a possible workaround was manually set DEB_CFLAGS_STRIP=-ffat-lto-objects in environment)

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Hi!

This has come up in the past, and while it would be nice to be able to
support multiple compilers in general for a specific vendor the build
flags default and are adapted just to the default compiler for that
distribution.

Here's mail covering what autodetection would involve if this was to
be supported:

https://lists.debian.org/debian-dpkg/2014/06/msg00050.html

Yes, in this case if you change the compiler, then you need to adapt
any such build flags that might not play well with it.

So, I'm afraid there's not much that can be done here. Perhaps this
could be documented somewhere more prominently, but I'm not sure
where, perhaps the dpkg-buildpackage or dpkg-buildflags man pages or
similar, not sure if that would have helped in your case?

Otherwise, I'm inclined to probably be closing this in a bit.

Thanks,
Guillem

Hi!

I got a reply off-BTS where VSYakovetsky mentioned it would be fine to
close. I still think this could do with some documentation somewhere
so I'll ponder about this, and otherwise either will improve some docs…

…or if I don't come up with anything will be closing it.

Thanks,
Guillem