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Support deterministic builds by remapping the __FILE__ prefix if the … #309

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Merged
merged 2 commits into from
Aug 19, 2019
Merged

Support deterministic builds by remapping the __FILE__ prefix if the … #309

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Support deterministic builds by remapping the __FILE__ prefix if the …
jgalenson Aug 19, 2019
c8f7928
Update comment to mention where the __FILE__ macro is used.
jgalenson Aug 19, 2019
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5 changes: 5 additions & 0 deletions build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -423,6 +423,11 @@ mod c {
panic!("RUST_COMPILER_RT_ROOT={} does not exist", root.display());
}

// Support deterministic builds by remapping the __FILE__ prefix if the
// compiler supports it. This fixes the nondeterminism caused by the
// use of that macro in lib/builtins/int_util.h in compiler-rt.
cfg.flag_if_supported(&format!("-ffile-prefix-map={}=.", root.display()));

let src_dir = root.join("lib/builtins");
for (sym, src) in sources.map.iter() {
let src = src_dir.join(src);
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