[GHC] #14311: PowerPC: Symbol already defined

[GHC]

#14311: PowerPC: Symbol already defined
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        Reporter:  trommler             |                Owner:  (none)
            Type:  bug                  |               Status:  new
        Priority:  normal               |            Milestone:  8.4.1
       Component:  Compiler             |              Version:  8.3
      Resolution:                       |             Keywords:
Operating System:  Unknown/Multiple     |         Architecture:  powerpc
 Type of failure:  Building GHC failed  |            Test Case:
      Blocked By:                       |             Blocking:
 Related Tickets:                       |  Differential Rev(s):
       Wiki Page:                       |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"f8e7fece58fa082b8b5a87fb84ffd5d18500d26a/ghc"
 f8e7fece/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f8e7fece58fa082b8b5a87fb84ffd5d18500d26a"
 Fix PPC NCG after blockID patch

 Commit rGHC8b007ab assigns the same label to the first basic block
 of a proc and to the proc entry point. This violates the PPC 64-bit ELF
 v. 1.9 and v. 2.0 ABIs and leads to duplicate symbols.

 This patch fixes duplicate symbols caused by block labels

 In commit rGHCd7b8da1 an info table label is generated from a block id.
 Getting the entry label from that info label leads to an undefined
 symbol because a suffix "_entry" that is not present in the block label.

 To fix that issue add a new info table label flavour for labels
 derived from block ids. Converting such a label with toEntryLabel
 produces the original block label.

 Fixes #14311

 Test Plan: ./validate

 Reviewers: austin, bgamari, simonmar, erikd, hvr, angerman

 Reviewed By: bgamari

 Subscribers: rwbarton, thomie

 GHC Trac Issues: #14311

 Differential Revision: https://phabricator.haskell.org/D4149
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14311#comment:1>
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