Rollup merge of #72952 - pnkfelix:regression-test-for-issue-70924, r=nikomatsakis
run-make regression test for issue #70924. Sometime after my PR #72767 (to fix issue #70924) landed, I realized that I *could* make a local regression test, thanks to `rustc --print sysroot`: I can make a fresh "copy" (really mostly symlinks) of the sysroot, and then modify it to recreate the terms of this bug.
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-include ../tools.mk
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# rust-lang/rust#70924: Test that if we add rust-src component in between two
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# incremetnal compiles, the compiler does not ICE on the second.
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# This test uses `ln -s` rather than copying to save testing time, but its
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# usage doesn't work on windows. So ignore windows.
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# ignore-windows
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SYSROOT:=$(shell $(RUSTC) --print sysroot)
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FAKEROOT=$(TMPDIR)/fakeroot
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INCR=$(TMPDIR)/incr
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# Make a local copy of the sysroot; then remove the rust-src part of it, if
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# present, for the *first* build. Then put in a facsimile of the rust-src
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# component for the second build, in order to expose the ICE from issue #70924.
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#
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# Note that it is much easier to just do `cp -a $(SYSROOT)/* $(FAKEROOT)` as a
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# first step, but I am concerned that would be too expensive in a unit test
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# compared to making symbolic links.
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#
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# Anyway, the pattern you'll see here is: For every prefix in
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# root/lib/rustlib/src, link all of prefix parent content, then remove the
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# prefix, then loop on the next prefix. This way, we basically create a copy of
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# the context around root/lib/rustlib/src, and can freely add/remove the src
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# component itself.
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all:
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mkdir $(FAKEROOT)
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ln -s $(SYSROOT)/* $(FAKEROOT)
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rm -f $(FAKEROOT)/lib
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mkdir $(FAKEROOT)/lib
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ln -s $(SYSROOT)/lib/* $(FAKEROOT)/lib
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rm -f $(FAKEROOT)/lib/rustlib
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mkdir $(FAKEROOT)/lib/rustlib
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ln -s $(SYSROOT)/lib/rustlib/* $(FAKEROOT)/lib/rustlib
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rm -f $(FAKEROOT)/lib/rustlib/src
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mkdir $(FAKEROOT)/lib/rustlib/src
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ln -s $(SYSROOT)/lib/rustlib/src/* $(FAKEROOT)/lib/rustlib/src
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rm -f $(FAKEROOT)/lib/rustlib/src/rust
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$(RUSTC) --sysroot $(FAKEROOT) -C incremental=$(INCR) main.rs
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mkdir -p $(FAKEROOT)/lib/rustlib/src/rust/src/libstd
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touch $(FAKEROOT)/lib/rustlib/src/rust/src/libstd/lib.rs
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$(RUSTC) --sysroot $(FAKEROOT) -C incremental=$(INCR) main.rs
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fn main() {
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println!("Hello World");
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}
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