[GHC] #15145: Emit info-level log message when package environments have been picked up

[GHC]

#15145: Emit info-level log message when package environments have been picked up
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  hvr
            Type:  feature request   |               Status:  patch
        Priority:  high              |            Milestone:  8.4.3
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4689
       Wiki Page:                    |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"00049e2dce93b1e468c3fde3287371eb988aafdc/ghc"
 00049e2d/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="00049e2dce93b1e468c3fde3287371eb988aafdc"
 Emit info-level log message when package envs are loaded

 A common complaint with the new package environment files feature is
 that it's not obvious when package environments have been picked up.
 This patch applies the same strategy that was already used for `.ghci`
 files
 (which exhibit similar potential for confusion, c.f. #11389) to package
 environment files.

 For instance, this new notification looks like below for a GHCi invocation
 which
 loads both, a GHCi configuration as well as a package environment:

   GHCi, version 8.5.20180512: http://www.haskell.org/ghc/  :? for help
   Loaded package environment from
 /tmp/parsec-3.1.13.0/.ghc.environment.x86_64-linux-8.5.20180512
   Loaded GHCi configuration from /home/hvr/.ghci
   Prelude>

 Addresses #15145

 Reviewed By: bgamari, angerman

 GHC Trac Issues: #15145

 Differential Revision: https://phabricator.haskell.org/D4689
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15145#comment:3>
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