[GHC] #9862: defined but not used errors on Solaris/SPARC

[GHC]

#9862: defined but not used errors on Solaris/SPARC
-------------------------------------+-------------------------------------
       Reporter:  ezyang             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler (NCG)     |                 Version:  7.8.2
       Keywords:                     |        Operating System:  Solaris
   Architecture:  sparc              |         Type of failure:  Incorrect
     Difficulty:  Unknown            |  warning at compile-time
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 I recently tried building GHC on Solaris and I got a ton of these files
 when compiling the bootstrapping copy of Cabal:

 {{{
 "/afs/sipb/user/ezyang/ghc-7.8.2/usr/bin//ghc" -H32m -O -Werror -Wall
 -H64m -O0 \
                -optc-Werror -optc-Wall -optc-fno-stack-protector \
                 \
                --make utils/ghc-cabal/Main.hs -o utils/ghc-
 cabal/dist/build/tmp/ghc-cabal \
                -no-user-package-db \
                -Wall -fno-warn-unused-imports -fno-warn-warnings-
 deprecations \
                -DCABAL_VERSION=1,21,1,0 \
                -DBOOTSTRAPPING \
                -odir  bootstrapping \
                -hidir bootstrapping \
                -ilibraries/Cabal/Cabal \
                -ilibraries/binary/src -DGENERICS \
                -ilibraries/filepath \
                -ilibraries/hpc \
                -w
 "rm" -f compiler/stage1/build/Config.hs
 Creating compiler/stage1/build/Config.hs ...
 "rm" -f utils/ghc-pkg/dist/build/Version.hs
 echo "module Version where"                    >> utils/ghc-
 pkg/dist/build/Version.hs
 echo "version, targetOS, targetARCH :: String" >> utils/ghc-
 pkg/dist/build/Version.hs
 echo "version    = \"7.9.20141204\""      >> utils/ghc-
 pkg/dist/build/Version.hs
 echo "targetOS   = \"solaris2\""        >> utils/ghc-
 pkg/dist/build/Version.hs
 echo "targetARCH = \"sparc\""      >> utils/ghc-pkg/dist/build/Version.hs
 done.
 [ 1 of 86] Compiling Distribution.Compat.CreatePipe (
 libraries/Cabal/Cabal/Distribution/Compat/CreatePipe.hs,
 bootstrapping/Distribution/Compat/CreatePipe.o )
 cc1: warnings being treated as errors
 /tmp/ghc322370_0/ghc322370_21.hc: In function ‘s1xM_entry’:

 /tmp/ghc322370_0/ghc322370_21.hc:21:0:
      error: label ‘_c312’ defined but not used
 /tmp/ghc322370_0/ghc322370_21.hc: In function ‘s1xK_entry’:

 /tmp/ghc322370_0/ghc322370_21.hc:63:0:
      error: label ‘_c31b’ defined but not used
 }}}

 Maybe the 7.8.2 codegen which I bootstrapped from is buggy in some way? It
 makes it mildly difficult to actually validate.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9862>
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