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arch: loongarch64_nosimd: Pass -mattr=-lsx to the linker plugin for Rust #66

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arch: loongarch64_nosimd: Pass -mattr=-lsx to the linker plugin for Rust #66

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7 changes: 7 additions & 0 deletions arch/loongarch64_nosimd.sh
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Expand Up @@ -24,3 +24,10 @@ fi
# - https://github.com/rust-lang/rust/blob/a932eb36f8adf6c8cdfc450f063943da3112d621/compiler/rustc_target/src/spec/targets/loongarch64_unknown_linux_gnu.rs#L18
# - https://github.com/llvm/llvm-project/blob/98b895da30c03b7061b8740d91c0e7998e69d091/clang/lib/Driver/ToolChains/Arch/LoongArch.cpp#L133
RUSTFLAGS_COMMON_ARCH=('-Ctarget-cpu=generic-la64' '-Ctarget-feature=-lsx,+d' '-Clink-arg=-mabi=lp64d')

# Rustc does not apply -Ctarget-feature as an attribute to the main function
# (the function that __libc_start_call_main calls, not crate::main). So
# during LTO, the linker plugin may inline some code into main and vectorize
# them. Tell lld to disable LSX unless it's explicitly enabled in the
# function attribute, so main won't be vectorized.
RUSTFLAGS_COMMON_ARCH_LTO=('-Clink-arg=-Wl,-plugin-opt,-mattr=-lsx')