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rust: enable build on LLVM-only systems #304

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rust: enable build on LLVM-only systems #304

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22 changes: 21 additions & 1 deletion extra/rust/build
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Original file line number Diff line number Diff line change
Expand Up @@ -59,12 +59,33 @@ jemalloc = false
debug-assertions = false
codegen-tests = false
codegen-units-std = 1
EOF

case $("$CC" -print-file-name=libunwind.so) in */*)
cat >> config.toml <<EOF
llvm-libunwind = "system"
EOF
esac

cat >> config.toml <<EOF
[target.x86_64-unknown-linux-musl]
llvm-config = "/usr/bin/llvm-config"
crt-static = false
EOF

# Since libgcc_s.so is needed for Rust's own bootstrap binary, and
# it's dynamically linked, we'll have to add two files, libgcc_s.so.1
# for the symlink, and libgcc_s.so so the linker points to libunwind.
case $("$CC" -print-file-name=libunwind.so) in */*)
mkdir -p libgcc
ln -sf /usr/lib/libunwind.so.1 libgcc/libgcc_s.so.1
cat > libgcc/libgcc_s.so <<EOF
INPUT(-lunwind)
EOF
export LD_LIBRARY_PATH="$PWD/libgcc:$LD_LIBRARY_PATH"
export LIBRARY_PATH="$PWD/libgcc:$LIBRARY_PATH"
esac

Comment on lines +76 to +88
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Is upstream doing anything about this?

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Not that I know of. But I think they should've statically compiled the bootstrap binary instead of making it dynamically linked. Also, it's ugly so I understand if this ended up not being merged.

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They can't statically compile it because proc_macro doesn't support static linking or at least that's what the upstream rust people said when I bought up the idea. I can say that libunwind.so is mostly ABI compatible on x86_64 systems, on aarch64 and others the rust binary requires symbols such as __clear_cache which are provided by compiler-rt. I solved this with the below command:

clang -shared -o build/libgcc_s.so.1 \
-Wl,--allow-multiple-definition -Wl,--whole-archive \
$(clang -print-libgcc-file-name) -lunwind

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@konimex konimex Aug 4, 2021 •
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I'll try this later on my build file. Thanks!

python3 ./x.py build -j "$(nproc)"
python3 ./x.py install

Expand All @@ -73,4 +94,3 @@ rm -rf \
"$1/usr/share/doc" \
"$1/usr/share/zsh" \
"$1/usr/lib/rustlib/uninstall.sh"