No output defined in main branch

[vitoyucepi]

Description

I've noticed that liquidsoap:2.3.x from the main branch does not exit if no output is defined. Is this intended behavior or not?

Try starting liquidsoap with a simple script.

sine()

In 2.2 it stops with

Warning 4: Unused variable timeout
At /tmp/test/main.liq, line 1, char 0-6:
sine()

Warning 2: This source is unused, maybe it needs to
be connected to an output.
No output defined, nothing to do.

In 2.3 it starts with

At /tmp/test/main.liq, line 1, char 0-6:
sine()

Warning 2: This source is unused, maybe it needs to
be connected to an output.

Versions

• OS: alpine:3.19 in docker

• Version: 1a262d4

• build config

  * Liquidsoap version  : 2.3.0+dev
  
  * Compilation options
    - Release build       : false
    - Git SHA             : (none)
    - OCaml version       : 5.1.1
    - OS type             : Unix
    - Libs versions       : angstrom=0.16.0 bigstringaf=0.9.1 bytes=[distributed with OCaml 4.02 or above] camlp-streams camomile.lib=2.0 cry=1.0.3 curl=0.9.2 dtools=0.4.5 dune-build-info=3.15.0 dune-private-libs.dune-section=3.15.0 dune-site=3.15.0 dune-site.private=3.15.0 duppy=0.9.4 fileutils=0.6.4 gen=1.1 liquidsoap-lang=2.3.0 liquidsoap-lang.console=2.3.0 liquidsoap_builtins liquidsoap_core liquidsoap_optionals liquidsoap_oss liquidsoap_runtime liquidsoap_stdlib magic-mime=1.3.1 mem_usage=0.1.0 menhirLib=20231231 metadata=0.3.0 mm=0.8.5 mm.audio=0.8.5 mm.base=0.8.5 mm.image=0.8.5 mm.midi=0.8.5 mm.video=0.8.5 re=1.11.0 sedlex=3.2 seq=[distributed with OCaml 4.07 or above] stdlib-shims=0.3.0 str=5.1.1 stringext=1.6.0 threads=5.1.1 unix=5.1.1 uri=4.4.0
    - architecture        : amd64
    - host                : x86_64-pc-linux-musl
    - target              : x86_64-pc-linux-musl
    - system              : linux
    - ocamlopt_cflags     : -O2 -fno-strict-aliasing -fwrapv -pthread -fPIC
    - native_c_compiler   : gcc -O2 -fno-strict-aliasing -fwrapv -pthread -fPIC -D_FILE_OFFSET_BITS=64
    - native_c_libraries  : -lpthread
  
  * Configured paths
    - mode              : posix
    - standard library  : /usr/share/liquidsoap/libs
    - scripted binaries : /usr/share/liquidsoap/bin
    - rundir            : /var/run/liquidsoap
    - logdir            : /var/log/liquidsoap
    - camomile files    : /usr/share/liquidsoap/camomile
  
  * Supported input formats
    - MP3               : no (requires mad)
    - AAC               : no (requires faad)
    - Ffmpeg            : no (requires ffmpeg)
    - Flac (native)     : no (requires flac)
    - Flac (ogg)        : no (requires ogg)
    - Opus              : no (requires opus)
    - Speex             : no (requires speex)
    - Theora            : no (requires theora)
    - Vorbis            : no (requires vorbis)
  
  * Supported output formats
    - FDK-AAC           : no (requires fdkaac)
    - Ffmpeg            : no (requires ffmpeg)
    - MP3               : no (requires lame)
    - MP3 (fixed-point) : no (requires shine)
    - Flac (native)     : no (requires flac)
    - Flac (ogg)        : no (requires ogg)
    - Opus              : no (requires opus)
    - Speex             : no (requires speex)
    - Theora            : no (requires theora)
    - Vorbis            : no (requires vorbis)
  
  * Tags
    - Taglib (ID3 tags) : no (requires taglib)
    - Vorbis            : no (requires vorbis)
  
  * Input / output
    - ALSA              : no (requires alsa)
    - AO                : no (requires ao)
    - FFmpeg            : no (requires ffmpeg)
    - GStreamer         : no (requires gstreamer)
    - JACK              : no (requires bjack)
    - OSS               : yes
    - Portaudio         : no (requires portaudio)
    - Pulseaudio        : no (requires pulseaudio)
    - SRT               : no (requires srt)
  
  * Audio manipulation
    - FFmpeg            : no (requires ffmpeg)
    - LADSPA            : no (requires ladspa)
    - Lilv              : no (requires lilv)
    - Samplerate        : no (requires samplerate)
    - SoundTouch        : no (requires soundtouch)
    - StereoTool        : no (requires ctypes-foreign)
  
  * Video manipulation
    - camlimages        : no (requires camlimages)
    - FFmpeg            : no (requires ffmpeg)
    - frei0r            : no (requires frei0r)
    - ImageLib          : no (requires imagelib)
    - SDL               : no (requires tsdl-image & tsdl-ttf)
  
  * MIDI manipulation
    - DSSI              : no (requires dssi)
  
  * Visualization
    - GD                : no (requires gd)
    - Graphics          : no (requires graphics)
    - SDL               : no (requires tsdl-image & tsdl-ttf)
  
  * Additional libraries
    - FFmpeg filters    : no (requires ffmpeg)
    - FFmpeg devices    : no (requires ffmpeg)
    - inotify           : no (requires inotify)
    - irc               : no (requires irc-client-unix)
    - jemalloc          : no (requires jemalloc)
    - lastfm            : no (requires lastfm)
    - lo                : no (requires lo)
    - memtrace          : no (requires memtrace)
    - osc               : no (requires osc-unix)
    - ssl               : no (requires ssl)
    - sqlite3           : no (requires sqlite3)
    - tls               : no (requires tls-liquidsoap)
    - posix-time2       : no (requires posix)
    - windows service   : no (requires winsvc)
    - YAML support      : no (requires yaml)
    - XML playlists     : no (requires xmlplaylist)
  
  * Monitoring
    - Prometheus        : no (requires prometheus)