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build_helper: destination file can't be up to date when not exists #46421

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Dec 2, 2017
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build_helper: destination file can't be up to date when not exists #46421

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3 changes: 3 additions & 0 deletions src/build_helper/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,9 @@ pub fn mtime(path: &Path) -> FileTime {
///
/// Uses last-modified time checks to verify this.
pub fn up_to_date(src: &Path, dst: &Path) -> bool {
if !dst.exists() {
return false;
}
let threshold = mtime(dst);
let meta = match fs::metadata(src) {
Ok(meta) => meta,
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