Add support for the Fil-C toolchain

[paul-reilly]

Is your feature request related to a problem? Please describe.

Fil-C is a new compiler that compiles 100% memory safe C and C++ binaries.

Releases are found here

It is based on Clang 20.1.8 so all the usual flags work.

Describe the solution you'd like

• ideally it should be available as an xmake-repo package for zero setup
• binaries are not ABI compatible with standard C or C++ so a new package target type would be needed to compile xmake packages with the toolchain

Describe alternatives you've considered

No response

Additional context

No response

[waruqi]

you can open a pr to add it in xmake-repo first.

[paul-reilly]

@waruqi , that's the package added. I've looked at adding support myself but I don't think just adding it like zig c/c++, for example would work as is since we need a way of detecting Fil-C in packages and conditionally applying patches.

[waruqi]

Adding the package is just the first step.

xmake now allows for fully custom toolchains in user projects without requiring built-in xmake support.

you can refer

• https://github.com/xmake-io/xmake/tree/dev/tests/apis/custom_toolchain
• https://xmake.io/guide/project-configuration/toolchain-configuration.html#custom-toolchains

then bind your custom toolchain and package.

• xmake/tests/projects/package/toolchain_muslcc/xmake.lua

  Line 36 in c5d08dc

  set_toolchains("my_muslcc@muslcc")

You can work on it in your own project first. Once it's fully functional, you can submit this patch to xmake.