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guix/gnu/packages/patches/julia-SOURCE_DATE_EPOCH-mtime.patch

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Fix one of upstream non-determinism, tracked here:
https://github.com/JuliaLang/julia/issues/34115
https://github.com/JuliaLang/julia/issues/25900
Patch by Nicoló Balzarotti <nicolo@nixo.xyz>.
--- a/base/loading.jl
+++ b/base/loading.jl
@@ -807,7 +807,10 @@
path = normpath(joinpath(dirname(prev), _path))
end
if _track_dependencies[]
- push!(_require_dependencies, (mod, path, mtime(path)))
+ push!(_require_dependencies,
+ (mod, path,
+ haskey(ENV, "SOURCE_DATE_EPOCH") ?
+ parse(Float64, ENV["SOURCE_DATE_EPOCH"]) : mtime(path)))
end
return path, prev
end