libobs is underlinked

Operating System Info

Other

Other OS

Debian

OBS Studio Version

29.1.3

OBS Studio Version (Other)

No response

OBS Studio Log URL

n.n.

OBS Studio Crash Log URL

n.n.

Expected Behavior

obs explicitly encodes all runtime dependencies to dynamic libraries.

Current Behavior

building obs results in a libobs.so which uses symbols from libm but fails to link against the library.

Steps to Reproduce

$ wget https://github.com/obsproject/obs-studio/releases/download/29.1.3/obs-studio_29.1.3-0obsproject1.focal_amd64.deb
$ dpkg -x obs-studio_29.1.3-0obsproject1.focal_amd64.deb OBS
$ strings OBS/usr/lib/x86_64-linux-gnu/libobs.so.29 | grep asinf
asinf
$ readelf -d OBS/usr/lib/x86_64-linux-gnu/libobs.so.29  | grep  lib
 0x0000000000000001 (NEEDED)             Shared library: [libavcodec.so.58]
 0x0000000000000001 (NEEDED)             Shared library: [libavformat.so.58]
 0x0000000000000001 (NEEDED)             Shared library: [libavutil.so.56]
 0x0000000000000001 (NEEDED)             Shared library: [libswscale.so.5]
 0x0000000000000001 (NEEDED)             Shared library: [libswresample.so.3]
 0x0000000000000001 (NEEDED)             Shared library: [libjansson.so.4]
 0x0000000000000001 (NEEDED)             Shared library: [libz.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libX11-xcb.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libxcb.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libuuid.so.1]
 0x0000000000000001 (NEEDED)             Shared library: [libpulse.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libgio-2.0.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libwayland-client.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libxkbcommon.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libpthread.so.0]
 0x0000000000000001 (NEEDED)             Shared library: [libX11.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]
 0x000000000000000e (SONAME)             Library soname: [libobs.so.0]
 0x000000000000001d (RUNPATH)            Library runpath: [/usr/lib/x86_64-linux-gnu]
$ readelf -d OBS/usr/lib/x86_64-linux-gnu/libobs.so.29  | grep  libm
$

Anything else we should know?

typically this is not a very big deal, as libm is pulled in via various other libraries.

nevertheless i think that any direct dependency should be expressed explicitly (rather than implicitly trusting that somebody else will do the work)

Start with the libobs shared-library build configuration and reproduce the report using the provided dpkg, strings, and readelf commands on the OBS 29.1.3 package. Done means the built libobs.so explicitly reports libm as a runtime dependency, while the existing dependency checks remain intact.