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std.Build: use Cache hash helper for package prefix dirs

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Previously this code used SipHash(1, 3) directly; now that we have the
cache system available in the build system, borrow the same
implementation as is being used everywhere else.
This commit is contained in:
Andrew Kelley 2023-03-09 21:16:53 -07:00
parent 29cfd47d65
commit 59f5df3af9
1 changed files with 8 additions and 11 deletions
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19
lib/std/Build.zig
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@ -384,20 +384,17 @@ fn applyArgs(b: *Build, args: anytype) !void {
},
}
}
const Hasher = std.crypto.auth.siphash.SipHash128(1, 3);
// Create an installation directory local to this package. This will be used when
// dependant packages require a standard prefix, such as include directories for C headers.
var hash = b.cache.hash;
// Random bytes to make unique. Refresh this with new random bytes when
// implementation is modified in a non-backwards-compatible way.
var hash = Hasher.init("ZaEsvQ5ClaA2IdH9");
hash.update(b.dep_prefix);
hash.add(@as(u32, 0xd8cb0055));
hash.addBytes(b.dep_prefix);
// TODO additionally update the hash with `args`.
var digest: [16]u8 = undefined;
hash.final(&digest);
var hash_basename: [digest.len * 2]u8 = undefined;
_ = std.fmt.bufPrint(&hash_basename, "{s}", .{std.fmt.fmtSliceHexLower(&digest)}) catch
unreachable;
const install_prefix = try b.cache_root.join(b.allocator, &.{ "i", &hash_basename });
const digest = hash.final();
const install_prefix = try b.cache_root.join(b.allocator, &.{ "i", &digest });
b.resolveInstallPrefix(install_prefix, .{});
}