ABI mismatch for riscv64gc-unknown-none-elf #795
Description
Currently cc builds for riscv*-unknown-none-elf targets with -mabi=lp64:
Lines 1973 to 1975 in 06c1289
However for riscv64gc-unknown-none-elf rustc produces lp64d binaries, which would fail to link with lp64 binaries. Adding .flag("-mabi=lp64d") works around this issue.
See this demo repo: https://github.com/dramforever/demo-cc-rs-riscv64gc
$ cargo build --target riscv64gc-unknown-none-elf
Compiling demo-cc-rs-riscv64gc v0.1.0 (/home/dram/code/virtiotic/demo-cc-rs-riscv64gc)
error: linking with `rust-lld` failed: exit status: 1
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= note: [omitted]
= note: rust-lld: error: /home/dram/code/virtiotic/demo-cc-rs-riscv64gc/target/riscv64gc-unknown-none-elf/debug/build/demo-cc-rs-riscv64gc-add89ab8ebfbee8b/out/libanswer.a(answer.o): cannot link object files with different floating-point ABI
error: could not compile `demo-cc-rs-riscv64gc` due to previous errorMaybe we should copy the default ABI settings from rustc instead of using the current detection scheme. Unfortunately I couldn't find any docs on this.