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27 lines
1.4 KiB
Makefile
27 lines
1.4 KiB
Makefile
include ../tools.mk
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# `llvm-objdump`'s output looks different on windows than on other platforms.
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# It should be enough to check on Unix platforms, so:
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# ignore-windows
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# Staticlibs don't include Rust object files from upstream crates if the same
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# code was already pulled into the lib via LTO. However, the bug described in
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# https://github.com/rust-lang/rust/issues/64153 lead to this exclusion not
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# working properly if the upstream crate was compiled with an explicit filename
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# (via `-o`).
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#
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# This test makes sure that functions defined in the upstream crates do not
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# appear twice in the final staticlib when listing all the symbols from it.
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all:
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$(RUSTC) --crate-type rlib upstream.rs -o $(TMPDIR)/libupstream.rlib -Ccodegen-units=1
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$(RUSTC) --crate-type staticlib downstream.rs -Clto -Ccodegen-units=1 -o $(TMPDIR)/libdownstream.a
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# Dump all the symbols from the staticlib into `syms`
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"$(LLVM_BIN_DIR)"/llvm-objdump -t $(TMPDIR)/libdownstream.a > $(TMPDIR)/syms
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# Count the global instances of `issue64153_test_function`. There'll be 2
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# if the `upstream` object file got erroneously included twice.
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# The line we are testing for with the regex looks something like:
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# 0000000000000000 g F .text.issue64153_test_function 00000023 issue64153_test_function
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grep -c -e "[[:space:]]g[[:space:]]*F[[:space:]].*issue64153_test_function" $(TMPDIR)/syms > $(TMPDIR)/count
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[ "$$(cat $(TMPDIR)/count)" -eq "1" ]
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