[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Problem linking Linux Sound Library (#360)

[Tobias Pape]

Hi.

The problem here is that the sound pluing (`vm-sound-pulse`) is in fact not linked agains the `libpulse-simple.so`. So says `ldd` and a quick glance a the code does not tell me why tho.

When the sound system is initialized, it apparently tries to dynload the `vm-sound-pulse` but since it has unresolved symbols, that fails.

However, using `LD_PRELOAD`, we force the `libpulse-simple.so` into the starting process, so that the dynload can actually succeed, as the missing symbols can already be found in the process. (`LD_PRELOAD` is present on al ELF-based systems, ie, Linux/BSD, Mach-O based use `DYLD_INSERT_LIBRARIES`, ie macOS).

The proper fix would be to ling `vm-sound-pulse` with `-lpulse-simple` somehow, but looking at the Make-includes/cmake files, I wonder why that's not the case in the first place.

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