[Meson] Only compile executables

[amontoison]

We don't need a library libsifdecode.a in practice, let's directly generate the binary from the Fortran files.

[jfowkes]

Yeah I guess a library for sifdecoder is not required but probably best to check with @dpo and @nimgould to ensure this doesn’t break any existing use cases!

[amontoison]

@jfowkes For the Meson build system, we never used it for something else than building the binary sifdecoder.

[jfowkes]

I agree entirely but I noticed that on https://github.com/optimizers/homebrew-cutest there are instructions for linking in the sifdecoder library? I guess that’s how the make build system works…

[amontoison]

I propose these changes because we plan a release 3.0.0 and it is safe to do breaking changes now.
You already renamed sifdecoder_standalone into sifdecoder.

[jfowkes]

@amontoison okay agreed! Merged.

[nimgould]

For the makefile builds, we have

% ar -t libsifdecode.a
sifdecode.o
sifdecoder_standalone.o
random.o
check_derivs.o

so, as you can see, the library contains more than just sifdecode. That is because the old sifdecoder has the ability to check generated derivatives, while that was not implemented for the standalone one as the checker needs to compile and link the generated element and group functions. But, I think we agreed that the meson build wasn't going to support all of the features that the makefile/script-based one does (it also misses select and classify).

[jfowkes]

Thanks @nimgould, yes @amontoison has already removed the check_derivs script and the select and classify scripts from the meson build as these are not implemented for the standalone sifdecoder.