[GHC] #10402: powerpc: unhandled ELF relocation(RelA) type 252

[GHC]

#10402: powerpc: unhandled ELF relocation(RelA) type 252
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        Reporter:  cjwatson        |                   Owner:  simonmar
            Type:  bug             |                  Status:  patch
        Priority:  normal          |               Milestone:  7.10.2
       Component:  Runtime System  |                 Version:  7.8.4
      Resolution:                  |                Keywords:
Operating System:  Linux           |            Architecture:  powerpc
 Type of failure:  Runtime crash   |               Test Case:
      Blocked By:                  |                Blocking:
 Related Tickets:                  |  Differential Revisions:  Phab:D996
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"c0847967caf51ea4ca88d0ffc25fe1bd99dcabed/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="c0847967caf51ea4ca88d0ffc25fe1bd99dcabed"
 powerpc: add basic support for PLT relocations (#10402)

 Commit a93ab43ab5f40cadbedea2f6342b93c245e91434
 enabled support for proper PIC relocations from
 assembler.

 Commit adds support for relocations of type:
     R_PPC_REL16_HI
     R_PPC_REL16_HA
     R_PPC_REL16_LO
     R_PPC_PLTREL24

 They are used only when GHC is built in
     DYNAMIC_GHC_PROGRAMS = NO
 mode.

 Verified by running the following test:

     // cat a.c
     #include <stdio.h>

     void ffi_a_hello (int i) {
         fprintf (stderr, "WEEEEEEEE: i=%d\n", i);
     }

     -- cat A.hs
     {-# LANGUAGE ForeignFunctionInterface #-}
     module A where

     import Foreign.C

     foreign import ccall "ffi_a_hello" a :: CInt -> IO ()

     # ghc -fPIC -c a.c -fforce-recomp
     # ghc -fPIC -c A.hs -fforce-recomp
     # ghc --interactive ./a.o A
     ...
     *A> a 42
     WEEEEEEEE: i=42
 See gory details in Trac #10402.

 Signed-off-by: Colin Watson <cjwatson at debian.org>
 Signed-off-by: Sergei Trofimovich <siarheit at google.com>

 Reviewed By: bgamari, austin

 Differential Revision: https://phabricator.haskell.org/D996

 GHC Trac Issues: #10402
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10402#comment:19>
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