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