Auto merge of #25848 - alexcrichton:fix-msvc, r=brson
Now that MSVC support has landed in the most recent nightlies we can now have MSVC bootstrap itself without going through a GNU compiler first. Unfortunately, however, the bootstrap currently fails due to the compiler not being able to find the llvm-ar.exe tool during the stage0 libcore compile. The compiler cannot find this tool because it's looking inside a directory that does not exist: $SYSROOT/rustlib/x86_64-pc-windows-gnu/bin The `gnu` on this triple is because the bootstrap compiler's host architecture is GNU. The build system, however, only arranges for the llvm-ar.exe tool to be available in this location: $SYSROOT/rustlib/x86_64-pc-windows-msvc/bin To resolve this discrepancy, the build system has been modified to understand triples that are bootstrapped from another triple, and in this case copy the native tools to the right location.
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commit
f14190199c
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@ -80,3 +80,8 @@ CUSTOM_DEPS_rustc_llvm_T_x86_64-pc-windows-msvc += \
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x86_64-pc-windows-msvc/rt/rustc_llvm.def: $(S)src/etc/mklldef.py \
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x86_64-pc-windows-msvc/rt/rustc_llvm.def: $(S)src/etc/mklldef.py \
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$(S)src/librustc_llvm/lib.rs
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$(S)src/librustc_llvm/lib.rs
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$(CFG_PYTHON) $^ $@ rustc_llvm-$(CFG_FILENAME_EXTRA)
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$(CFG_PYTHON) $^ $@ rustc_llvm-$(CFG_FILENAME_EXTRA)
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# All windows nightiles are currently a GNU triple, so this MSVC triple is not
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# bootstrapping from itself. This is relevant during stage0, and other parts of
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# the build system take this into account.
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BOOTSTRAP_FROM_x86_64-pc-windows-msvc := x86_64-pc-windows-gnu
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39
mk/target.mk
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mk/target.mk
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@ -181,3 +181,42 @@ $(foreach host,$(CFG_HOST), \
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$(foreach stage,$(STAGES), \
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$(foreach stage,$(STAGES), \
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$(foreach tool,$(TOOLS), \
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$(foreach tool,$(TOOLS), \
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$(eval $(call TARGET_TOOL,$(stage),$(target),$(host),$(tool)))))))
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$(eval $(call TARGET_TOOL,$(stage),$(target),$(host),$(tool)))))))
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# We have some triples which are bootstrapped from other triples, and this means
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# that we need to fixup some of the native tools that a triple depends on.
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#
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# For example, MSVC requires the llvm-ar.exe executable to manage archives, but
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# it bootstraps from the GNU Windows triple. This means that the compiler will
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# add this directory to PATH when executing new processes:
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#
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# $SYSROOT/rustlib/x86_64-pc-windows-gnu/bin
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#
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# Unfortunately, however, the GNU triple is not known about in stage0, so the
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# tools are actually located in:
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#
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# $SYSROOT/rustlib/x86_64-pc-windows-msvc/bin
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#
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# To remedy this problem, the rules below copy all native tool dependencies into
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# the bootstrap triple's location in stage 0 so the bootstrap compiler can find
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# the right sets of tools. Later stages (1+) will have the right host triple for
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# the compiler, so there's no need to worry there.
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#
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# $(1) - stage
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# $(2) - triple that's being used as host/target
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# $(3) - triple snapshot is built for
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# $(4) - crate
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# $(5) - tool
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define MOVE_TOOLS_TO_SNAPSHOT_HOST_DIR
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ifneq (,$(3))
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$$(TLIB$(1)_T_$(2)_H_$(2))/stamp.$(4): $$(HLIB$(1)_H_$(2))/rustlib/$(3)/bin/$(5)
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$$(HLIB$(1)_H_$(2))/rustlib/$(3)/bin/$(5): $$(TBIN$(1)_T_$(2)_H_$(2))/$(5)
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mkdir -p $$(@D)
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cp $$< $$@
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endif
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endef
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$(foreach target,$(CFG_TARGET), \
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$(foreach crate,$(CRATES), \
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$(foreach tool,$(NATIVE_TOOL_DEPS_$(crate)_T_$(target)), \
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$(eval $(call MOVE_TOOLS_TO_SNAPSHOT_HOST_DIR,0,$(target),$(BOOTSTRAP_FROM_$(target)),$(crate),$(tool))))))
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