compile: Replace ancient gcc crate with cc

[MarijnS95]

The gcc crate hasn't been updated for 5 years and clearly states that is deprecated after a rename to cc.

More importantly we're cross-compiling some Windows ISPC code to aarch64 and while GitHub's actions runners definitely have all the cross-compiling packages installed the old gcc crate was complaining that it could not find lib.exe for the desired target.

Note that this strangely happened to work fine on a developer machine, but it is unclear why.

[Twinklebear]

Thanks @MarijnS95 , this looks great to me! The CI runs have been failing because of an issue with ISPC and fneg that I have to look into. Maybe a newer version of ISPC would fix this.

[MarijnS95]

https://github.com/MarijnS95/ispc-rs/actions/runs/7153113257 1.22 is still broken, fwiw. Only on Mac.

[MarijnS95]

@Twinklebear oh, because Mac installs via brew instead of using the ISPC_VERSION env var to update it. So yes, 1.22 fixes it.

[MarijnS95]

If https://formulae.brew.sh/formula/ispc is to be believed, 1.22 should be available.

[MarijnS95]

https://github.com/MarijnS95/ispc-rs/actions/runs/7153175524/job/19479324178 hmm brew install ispc@1.22.0 doesn't work. Maybe a similar command to apt update is needed?

[Twinklebear]

Actually on my mac it seems I have ISPC 1.22 already, and don't remember doing anything specific to install that version. Maybe it's just a matter of waiting til the CI runners update. I'll update the ISPC version for the jobs that download it from Github

[Twinklebear]

Looks like adding a brew update first to the CI job got it to pick up ISPC 1.22 👍 : 6bf0e0b

[MarijnS95]

Good find, I only tried that on a run with explicit ispc@1.22.0 install, which it still could not find. While coming across an answer that suggested to install from the raw ispc.rb script link on GitHub, there were a few files with @<version> in the name so it seems selecting a specific version is only limited to a few dependencies. Pretty terrible that we cannot affix it to $ISPC_VERSION to match the other runners.

At least on https://github.com/Traverse-Research/ispc-downsampler/blob/ec3de05b04fe882c8575571ec9ff8fb06b7badf7/.github/workflows/generate-binaries.yaml#L48-L62 we just download ISPC from GitHub releases to match.