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Enable safe identical code folding for x86-64 musl releases (#59780)

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## What changed

Enable `--addrsig` and `--icf=safe` for `x86_64-unknown-linux-musl` release packages in Cargo and Bazel.

Opt Cargo release builds into these flags with `CODEX_MUSL_RELEASE_LINK_FLAGS=1`, selecting `lld` and preserving existing `RUSTFLAGS`. Apply the corresponding flags in Bazel's release package transition for the x86-64 musl platform.

GitOrigin-RevId: ade3c619dad2f03fd93a6fec35477607caec8b31
This commit is contained in:
Dmitriy Kovalenko
2026-11-06 01:33:51 +00:00
committed by copyberry
parent 74bfe33ec8
commit 1840e7dead
4 changed files with 19 additions and 0 deletions
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.github/scripts/install-musl-build-tools.sh
+6
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@@ -261,6 +261,12 @@ target_cxx_var="CXX_${TARGET}"
target_cxx_var="${target_cxx_var//-/_}"
echo "${target_cxx_var}=${cxx}" >> "$GITHUB_ENV"
# Enable safe identical code folding for release packages on x86-64 musl.
if [[ "${TARGET}" == "x86_64-unknown-linux-musl" && "${CODEX_MUSL_RELEASE_LINK_FLAGS:-}" == "1" ]]; then
link_flags=(-Cllvm-args=--addrsig -Clink-arg=-fuse-ld=lld -Clink-arg=-Wl,--icf=safe)
echo "RUSTFLAGS=${RUSTFLAGS:+$RUSTFLAGS }${link_flags[*]}" >> "$GITHUB_ENV"
fi
cargo_linker_var="CARGO_TARGET_${TARGET^^}_LINKER"
cargo_linker_var="${cargo_linker_var//-/_}"
echo "${cargo_linker_var}=${musl_linker}" >> "$GITHUB_ENV"