sdl2-config can fail when using clang over gcc.

[Bram Stolk]

The following will fail:

$ CC=clang /usr/bin/sdl2-config --static-libs
clang: error: unsupported option '-print-multiarch'
clang: error: no input files
...

Whereas using gcc as compiler will work correctly:

CC=gcc /usr/bin/sdl2-config --static-libs
/usr/lib/x86_64-linux-gnu/libSDL2.a -lm -lasound -lm -ldl -lpthread -lpulse-simple -lpulse -pthread -lsamplerate -lX11 -lXext -lXcursor -lXi -lXfixes -lXrandr -lXss -ldrm -lgbm -lwayland-egl -lwayland-client -lwayland-cursor -lxkbcommon -ldecor-0 -lpthread

This is because clang does not know the flag -print-multiarch

This makes it hard to use sdl2-config to query what flags to use when linking an SDL2 application statically.

OS: I have encountered this issue both in lunar lobster and mantic minotaur.

SDL2 version: 2.28.3+dfsg-2

Expected behaviour: no error, as in gcc case, when using clang.

$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu Mantic Minotaur (development branch)
Release: 23.10

[Paride Legovini (paride)]

Related:

[1] https://github.com/llvm/llvm-project/commit/e05edb19adbfd1b24f58d583e4b5b4d742f982ee

This looks like a valid issue which I can reproduce locally on my Mantic system, but I am not sure the issue should be fixed in Ubuntu. Given that clang explicitly disabled support for -print-multiarch in [1], I doubt that's the right project to report this issue against.

I suggest reporting the issue against libsdl:

  https://github.com/libsdl-org/SDL/issues

and see what they think about it.

[Bram Stolk (b-stolk)]

I reported it as a bug with SDL2, but actually, the bug stems from a Debian patch.
https://github.com/libsdl-org/SDL/issues/8244#issuecomment-1719808138

I then proceeded to file a bug with Debian, which I am unable to do from an Ubuntu machine:

  $ reportbug -B libsdl2-dev
  Ignored bogus setting for -B: libsdl2-dev
  *** ERROR: "Ubuntu" BTS is currently unsupported.

  Please use "ubuntu-bug" (from the apport package) for reporting bugs in Ubuntu.

  You can report bugs to Debian by specifying 'bts debian' in your ~/.reportbugrc
  or by passing the -B debian option on the commandline (see reportbug(1)).

I have tried sending an email bug report to debian instead. I will update w bug nr iif it makes it through the automated system.

[Bram Stolk (b-stolk)]

Bug reported with Debian:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1051946

[Mitchell Dzurick (mitchdz)]

I started a build with the debian patch that should fix this. Could you verify if this fixes your issue once it's done building?

https://launchpad.net/~mitchdz/+archive/ubuntu/libsdl2-mantic-multiarch

I tried it quickly in a Mantic VM and still see the issue, but I could be doing something else wrong here.

$ lxc shell m
# apt install -y libsdl2-2.0-0
# apt install -y libsdl2-dev
# apt install -y clang gcc
# CC=clang /usr/bin/sdl2-config --static-libs
clang: error: unsupported option '-print-multiarch'
clang: error: no input files
/usr/lib//libSDL2.a -lm -lasound -lm -ldl -lpthread -lpulse-simple -lpulse -pthread -lsamplerate -lX11 -lXext -lXcursor -lXi -lXfixes -lXrandr -lXss -ldrm -lgbm -lwayland-egl -lwayland-client -lwayland-cursor -lxkbcommon -ldecor-0 -lpthread

I tried using my local build
# dpkg -i libsdl2-2.0-0_2.28.3+dfsg-2ubuntu1~mantic1_amd64.deb
# dpkg -i libsdl2-dev_2.28.3+dfsg-2ubuntu1~mantic1_amd64.deb
# CC=clang /usr/bin/sdl2-config --static-libs
clang: error: unsupported option '-print-multiarch'
clang: error: no input files
/usr/lib/x86_64-linux-gnu/libSDL2.a -lm -lasound -lm -ldl -lpthread -lpulse-simple -lpulse -pthread -lsamplerate -lX11 -lXext -lXcursor -lXi -lXfixes -lXrandr -lXss -ldrm -lgbm -lwayland-egl -lwayland-client -lwayland-cursor -lxkbcommon -ldecor-0 -lpthread

[Bram Stolk (b-stolk)]

$ sudo dpkg -i libsdl2-2.0-0_2.28.3+dfsg-2ubuntu1~mantic1_amd64.deb
(Reading database ... 396566 files and directories currently installed.)
Preparing to unpack libsdl2-2.0-0_2.28.3+dfsg-2ubuntu1~mantic1_amd64.deb ...
Unpacking libsdl2-2.0-0:amd64 (2.28.3+dfsg-2ubuntu1~mantic1) over
(2.28.3+dfsg-2ubuntu1~mantic1) ...
dpkg: dependency problems prevent configuration of libsdl2-2.0-0:amd64:
 libsdl2-2.0-0:amd64 depends on libc6 (>= 2.38); however:
  Version of libc6:amd64 on system is 2.37-0ubuntu2.1.

On Mon, Oct 23, 2023 at 11:36 AM Bryce Harrington <
<email address hidden>> wrote:

> ** Changed in: libsdl2 (Ubuntu)
> Status: Confirmed => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/2035422
>
> Title:
> sdl2-config can fail when using clang over gcc.
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/libsdl2/+bug/2035422/+subscriptions
>
>

--
Owner/Director of Game Studio Abraham Stolk Inc.
Vancouver BC, Canada
<email address hidden>