Changes between Version 32 and Version 33 of Commentary/GSoCMultipleInstances


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Timestamp:
Jun 21, 2012 2:20:07 PM (3 years ago)
Author:
simonmar
Comment:

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  • Commentary/GSoCMultipleInstances

    v32 v33  
    3636 * We define a new ''Cabal Hash'' that hashes the compilation inputs (the `LocalBuildInfo` and the contents of the source files)
    3737 * `XXXX` is a GUID.
    38    * Why not use the ''Cabal Hash''?  We could, but then there could conceivably be a clash.
     38   * Why not use the ''Cabal Hash''?  We could, but then there could conceivably be a clash. (Andres - please expand this point, I have forgotten the full rationale).
    3939 * `YYYY` is the combination of the ''Cabal Hash'' and `ZZZZ` (concatenated)
    40  * `ZZZZ` is recorded in the package database.  When two packages have identical `ZZZZ`s then they are interface-compatible, and the user might in the future want to change a particular dependency to use a different package but the the same `ZZZZ`.  We do not want to make this change automatically, because even when two packages have identical `ZZZZ`s, they may have different behaviour (e.g. bugfixes).
    41 
     40 * `ZZZZ` is recorded in the package database as a new field `abi-hash`.
     41   * When two packages have identical `ZZZZ`s then they are interface-compatible, and the user might in the future want to change a particular dependency to use a different package but the the same `ZZZZ`.  We do not want to make this change automatically, because even when two packages have identical `ZZZZ`s, they may have different behaviour (e.g. bugfixes).
    4242
    4343== Install location of installed Cabal packages ==