[GHC] #13541: Make it easier to use the gold linker

[GHC]

#13541: Make it easier to use the gold linker
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        Reporter:  bgamari           |                Owner:  bgamari
            Type:  feature request   |               Status:  patch
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13810, #13739    |  Differential Rev(s):  Phab:D3449
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"625143f473b58d770d2515b91c2566b52d35a4c3/ghc"
 625143f4/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="625143f473b58d770d2515b91c2566b52d35a4c3"
 configure: Coerce gcc to use $LD instead of system default

 The configure script will now try to coerce gcc to use the linker
 pointed to by $LD instead of the system default (typically bfd ld).
 Moreover, we now check for `ld.gold` and `ld.lld` before trying `ld`.

 The previous behavior can be reverted to by using the new
 --disable-ld-override flag.

 On my machine gold seems to trigger an apparent infelicity in
 constructor behavior, causing T5435_asm to fail. I've opened #13883 to
 record this issue and have accepted the questionable constructor
 ordering for the time being.

 Test Plan: Validate with `config_args='--enable-ld-override'`

 Reviewers: austin, hvr, simonmar

 Subscribers: duog, nh2, rwbarton, thomie, erikd, snowleopard

 GHC Trac Issues: #13541, #13810, #13883

 Differential Revision: https://phabricator.haskell.org/D3449
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13541#comment:26>
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