• Edward Z. Yang's avatar
    The -package flag should select match from right-most package db. · 1b000168
    Edward Z. Yang authored
    
    
    The shadowing and default behavior (in the absence of
    -hide-all-packages) prefers packages that come from "later" package
    databases.  So for example if tmp1.d and tmp2.d both expose p-1.0, then
    
        ghc -package-db tmp1.d -package-db tmp2.d
    
    brings the p-1.0 from tmp2.d into scope (and if they have the same IPID,
    tmp2.d shadows tmp1.d).  HOWEVER, -package flags do NOT respect this
    behavior.
    
        ghc -package-db tmp1.d -package-db tmp2.d -package p-1.0
    
    this will force the p-1.0 from tmp1.d to be exposed!  This is
    confusing, so this patch makes the behavior of -package flags
    consistent.
    Signed-off-by: default avatarEdward Z. Yang <ezyang@cs.stanford.edu>
    
    Test Plan: validate
    
    Reviewers: austin, bgamari
    
    Reviewed By: bgamari
    
    Subscribers: thomie
    
    Differential Revision: https://phabricator.haskell.org/D1709
    1b000168
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