[Bug 239193] lang/ghc: fix build on powerpc64 elfv1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239193

            Bug ID: 239193
           Summary: lang/ghc: fix build on powerpc64 elfv1
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: haskell at FreeBSD.org
          Reporter: pkubaj at FreeBSD.org
             Flags: maintainer-feedback?(haskell at FreeBSD.org)
          Assignee: haskell at FreeBSD.org

1. Dtrace currently doesn't work on powerpc64. I'm not sure whether it works on
CURRENT, but enabling it on 12 causes assertion errors from base. Consider
following patch:
Index: Makefile
===================================================================
--- Makefile    (revision 506459)
+++ Makefile    (working copy)
@@ -95,6 +95,10 @@
 LLVM_VERSION=          60
 .endif

+.if ${ARCH} == powerpc64 && ${OSVERSION} < 1300000
+CONFIGURE_ARGS+=       --enable-dtrace=0
+.endif
+
 .if ${ARCH} == amd64 || ${ARCH} == i386
 BOOT_GHC_VERSION=      8.4.3
 .else

2.
https://svnweb.freebsd.org/ports/head/lang/ghc/files/patch-ppc64?r1=494562&r2=506142
is another breakage on powerpc64 elfv1. Reverting to previous version of
patch-ppc64 works it around:
/wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5/rts/Schedule.c:451:0: error:
     undefined reference to `StgRun'
    |
451 |         r = StgRun((StgFunPtr) stg_returnToStackTop, &cap->r);
    | ^
/usr/local/bin/ld: rts/dist/build/libHSrts_thr-ghc8.6.5.so: hidden symbol
`StgRun' isn't defined
/usr/local/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status
`gcc8' failed in phase `Linker'. (Exit code: 1)
/usr/local/bin/ld: rts/dist/build/Schedule.l_dyn_o: in function `schedule':
/usr/local/bin/ld: rts/dist/build/Schedule.debug_dyn_o: in function `schedule':


/wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5/rts/Schedule.c:451:0: error:
     undefined reference to `StgRun'
    |
451 |         r = StgRun((StgFunPtr) stg_returnToStackTop, &cap->r);
    | ^
/wrkdirs/usr/ports/lang/ghc/work/ghc-8.6.5/rts/Schedule.c:451:0: error:
     undefined reference to `StgRun'


Could the current patch-ppc64 be applied only for elfv2 systems and for elfv1
the old patch be kept?

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