zigcc: Not working cross-compiling

[kassane]

@import("builtin") get only native target.

tested in ldc2-druntime/gist

---

This is a workaround for a previous problem with Darwin target support.
Note that when using the -mtriple flag, except for Darwin targets, ldc2 does not set the -target flag to CC.
Thus, zig cc will assume that the target is native (which is the default), and will not recognize a specific triple-target.
Likewise, looking at ldc2 internally, it appears that, like rustc, it calls the CC (like arm-none-eabi-gcc) of the selected target.

Reference

• Darwin target: triple conflicts sokol-d#1

[kassane]

Partial fix applied, but occurs some errors:

# rustc - arm64/macos
error: unable to run `dsymutil`: No such file or directory (os error 2)
# rustc - arm64/windows
error: toolchain 'nightly-x86_64-unknown-linux-gnu' does not support target 'aarch64-pc-windows-gnu'
note: you can see a list of supported targets with `rustc --print=target-list`
note: if you are adding support for a new target to rustc itself, see https://rustc-dev-guide.rust-lang.org/building/new-target.html
install
+- hellors
   +- rustup failure
error: the following command exited with error code 1:
/home/runner/.cargo/bin/rustup target add aarch64-pc-windows-gnu 

Rust-std not have mipsel and riscv64gc-musl support!

• riscv64gc-unknown-linux-musl support rust-cross/cargo-zigbuild#83
• Unable to -Zbuild-std for mips-unknown-linux-musl cross-rs/cross#1416

ldc2-druntime no have arm64/windows-msvc, mingw and wasm32 support

[kassane]

refactored: 58b6c8e
Now cross-compile works in flang-new (fortran) and ldc2 (D/dlang)... rust need rewrite using cargo!! 😮‍💨

[kassane]

Waiting more flags for extend flang support

• Flang driver compiler options request llvm/llvm-project#89888