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Add .cargo/config.toml setting CFLAGS_riscv32im_risc0_zkvm_elf to "-march=rv32im -nostdlib". This prevents cc-rs from injecting macOS-specific flags (-arch arm64, -mmacosx-version-min) into the riscv32-unknown-elf-gcc cross-compiler when building C dependencies (e.g. ring) for the guest target, which causes build failures on macOS 26 Tahoe.
gravityblast
approved these changes
Apr 29, 2026
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Add .cargo/config.toml setting CFLAGS_riscv32im_risc0_zkvm_elf to "-march=rv32im -nostdlib". This prevents cc-rs from injecting macOS-specific flags (-arch arm64, -mmacosx-version-min) into the riscv32-unknown-elf-gcc cross-compiler when building C dependencies (e.g. ring) for the guest target, which causes build failures on macOS 26 Tahoe.