[Buildroot] [Bug 15634] fluidsynths refers to missing libgomp.so.1

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15634

--- Comment #3 from Vincent Fazio <vfazio@xes-inc.com> ---
When I `make olddefconfig` with your defconfig, it looks like it's using
bootlin's bleeding edge toolchain.

Bootlin recently (last year) enabled OpenMP support in the toolchain:
https://github.com/bootlin/toolchains-builder/commit/93f88ed30a4fd13ada7e2debf0d035855a690585

FluidSynth _tests_ for OpenMP support:

https://github.com/FluidSynth/fluidsynth/blob/master/CMakeLists.txt#L734

Unfortunately, the default configured Bootlin external toolchains to not
accurately reflect that OpenMP is supported due to a small issue with
generating the fragments:

https://github.com/bootlin/toolchains-builder/issues/60

Those fragments are used by a parser to add the external toolchain entries to
BR, but since they're not accurate, the selected toolchain features are also
not accurate. Most importantly here is they're missing
`BR2_TOOLCHAIN_EXTERNAL_OPENMP=y`.

This flag drives whether or not OpenMP libraries will be copied into the
resulting rootfs. 

So the library tests for support (and it is supported by the toolchain), but
since BR doesn't think it's enabled, the dependent libraries aren't copied in.

The quickest short term solutions are to:

1. Update your defconfig to use a "Custom Toolchain" and to manually point it
to the bootlin toolchain and flag OpenMP support

2. Update your defconfig to use a Buildroot generated toolchain and decide if
it should have OpenMP support.

This has actually been a recent discussion in IRC and we're contemplating a
more resilient check here.

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