giac, xcas: init at 1.4.9

[symphorien]

Motivation for this change

package xcas on NixOS

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• NA Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[vyp]

Add maintainers.

[symphorien]

fixed

[orivej]

@symphorien Please review my changes in 0e725f43066921b2e4d5366c12c14576289086e8
I've noticed that hevea is not used during the build (the package must be installing pregenerated documentation), I'll delete it before the merge if it will remain unused.

[symphorien]

no problems for the changes you proposed.
How did you spot that hevea was not needed ? I put much efforts (given the build time) to strip unneeded dependencies from those listed on the home page, but I didn't spot it.

[orivej]

I used fptrace -d deps.json nix-build '<nixpkgs>' -A giac-with-xcas and then <deps.json jq . | grep hevea | sort -u. (NB. Apparently fptrace only works when nix sandboxing is disabled.)
This also let me know that yacc was unused (after all, bison is its replacement), perl did not run during the build (and so was not needed in nativeBuildInputs), and gfortran was only used as a library.

[symphorien]

Ah I did the same. I may have misread the output :°
To work around sandboxing I use nix-shell --pure --run "genericBuild" in a temp dir.