vasilito
1c870c06ec
cargo 1.98.0-dev (4d1f98451 2026-05-15) requires -Zunstable-options to be passed to cargo itself (not just rustc) to accept a custom target spec. Without it, the kernel Makefile fails with: error: error loading target specification: custom targets are unstable and require `-Zunstable-options` The Makefile already had -Z build-std, -Zbuild-std-features, and -Z json-target-spec (which are passed to rustc), but the top-level cargo invocation needed -Zunstable-options to accept the target. This is required by both nightly-2025-10-03 (the kernel fork rust-toolchain) and nightly-2026-04-01 (the host default). On the cookbook (redoxer-1.0 toolchain), the error is the same because -Zunstable-options is a separate cargo-level flag from the rustc-level -Z flags. Discovered when attempting to build redbear-mini after the 0.2.5 fork was created from 0.2.4. The Makefile worked on 0.2.4 because the prior kernel cook used a cached build; the 0.2.5 build started fresh and hit the error.
67 lines
1.7 KiB
Makefile
67 lines
1.7 KiB
Makefile
.PHONY: all check
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SOURCE:=$(dir $(realpath $(lastword $(MAKEFILE_LIST))))
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BUILD?=$(CURDIR)
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export RUST_TARGET_PATH=$(SOURCE)/targets
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ifeq ($(TARGET),)
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ARCH?=$(shell uname -m)
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else
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ARCH?=$(shell echo "$(TARGET)" | cut -d - -f1)
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endif
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ifeq ($(ARCH),riscv64gc)
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override ARCH:=riscv64
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GNU_TARGET=riscv64-unknown-redox
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else ifeq ($(ARCH),i686)
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override ARCH:=i586
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GNU_TARGET=i686-unknown-redox
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else
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GNU_TARGET=$(ARCH)-unknown-redox
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endif
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all: $(BUILD)/kernel $(BUILD)/kernel.sym
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LD_SCRIPT=$(SOURCE)/linkers/$(ARCH).ld
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LOCKFILE=$(SOURCE)/Cargo.lock
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MANIFEST=$(SOURCE)/Cargo.toml
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TARGET_SPEC=$(RUST_TARGET_PATH)/$(ARCH)-unknown-kernel.json
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KERNEL_CARGO_FEATURES?=
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$(BUILD)/kernel.all: $(LD_SCRIPT) $(LOCKFILE) $(MANIFEST) $(TARGET_SPEC) $(shell find $(SOURCE) -name "*.rs" -type f)
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cargo -Zunstable-options rustc \
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--bin kernel \
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--manifest-path "$(MANIFEST)" \
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--target "$(TARGET_SPEC)" \
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--release \
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-Z build-std=core,alloc -Zbuild-std-features=compiler-builtins-mem -Z json-target-spec \
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--features=$(KERNEL_CARGO_FEATURES) \
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-- \
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-C link-arg=-T -Clink-arg="$(LD_SCRIPT)" \
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-C link-arg=-z -Clink-arg=max-page-size=0x1000 \
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--emit link="$(BUILD)/kernel.all"
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$(BUILD)/kernel.sym: $(BUILD)/kernel.all
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$(GNU_TARGET)-objcopy \
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--only-keep-debug \
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"$(BUILD)/kernel.all" \
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"$(BUILD)/kernel.sym"
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$(BUILD)/kernel: $(BUILD)/kernel.all
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$(GNU_TARGET)-objcopy \
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--strip-debug \
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"$(BUILD)/kernel.all" \
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"$(BUILD)/kernel"
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KERNEL_CHECK_FEATURES?=
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check:
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cargo check \
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--bin kernel \
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--manifest-path "$(MANIFEST)" \
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--target "$(TARGET_SPEC)" \
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-Z build-std=core,alloc -Zbuild-std-features=compiler-builtins-mem -Z json-target-spec \
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--features=$(KERNEL_CHECK_FEATURES)
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