Initialize all fenv_t with __fe_dfl_env

[giordano]

Opening as a draft, but the hope is to fix #278.

[giordano]

At least CI here is happy, as much that means 🙂 Now I'm recompiling Julia on JuliaLang/julia@3c7bc45 with this change, to see if this is enough to fix compilation failure mentioned at #278 (comment).

[xctan]

It looks like feholdexcept() is also responsible for initializing fenv_t env, even if there are no actual hardware floating-point exception traps, just as on RISC-V. Instead of initializing env in the first place, can you try implementing fenv_t loading in feholdexcept(), which is a no-op on RISC-V?

[giordano]

Unfortunately this PR doesn't solve the issue reported at #278 (comment) 😞

Instead of initializing env in the first place, can you try implementing fenv_t loading in feholdexcept(), which is a no-op on RISC-V?

I'm not quite sure what you mean (sorry, I'm not really familiar with openlibm nor riscv-v internals, I'm just trying to fix the issue I observed). Would you be able to open a PR? Or at least give me some more directions of what to do?