Fix reproducible Windows build by stripping COFF symbol table#2084
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edouardparis merged 1 commit intowizardsardine:masterfrom Apr 9, 2026
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The GNU linker appends a COFF symbol table to the PE binary containing auxiliary symbol data (sizes, section offsets) that depends on compilation ordering. Since Rust/LLVM processes codegen units in parallel, this metadata varies between builds even with identical inputs. The COFF symbol table is not used at runtime (Windows ignores it) and modern debugging uses separate PDB files instead. Stripping it with --strip-all removes the non-deterministic data and also reduces binary size significantly
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utACK 6feeaea cross-checked hash of windows binaries w/ @edouardparis after build on my machine |
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…table cf7a17e Fix reproducible Windows build by stripping COFF symbol table (edouardparis) Pull request description: The GNU linker appends a COFF symbol table to the PE binary containing auxiliary symbol data (sizes, section offsets) that depends on compilation ordering. Since Rust/LLVM processes codegen units in parallel, this metadata varies between builds even with identical inputs. The COFF symbol table is not used at runtime (Windows ignores it) and modern debugging uses separate PDB files instead. Stripping it with --strip-all removes the non-deterministic data and also reduces binary size significantly this is a backport of #2084 ACKs for top commit: edouardparis: Self-ACK cf7a17e Tree-SHA512: bde59b68b2c6970b446ac5441799e5e586e3b51901037f97e125f4047c4154c98bb849e7846dc418b325c41b7a47161625368ba0033e39f11191edc6b16ceea0
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The GNU linker appends a COFF symbol table to the PE binary containing auxiliary symbol data (sizes, section offsets) that depends on compilation ordering. Since Rust/LLVM processes codegen units in parallel, this metadata varies between builds even with identical inputs.
The COFF symbol table is not used at runtime (Windows ignores it) and modern debugging uses separate PDB files instead. Stripping it with --strip-all removes the non-deterministic data and also reduces binary size significantly