Re: [GHC] #12755: Build from source fails on Ubuntu 16.10: ld: -r and -pie may not be used together

23 Oct 2016

      #12755: Build from source fails on Ubuntu 16.10: ld: -r and -pie may not be used
together
-------------------------------------+-------------------------------------
        Reporter:  SamuelMarks       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Build System      |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Building GHC      |  (amd64)
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by SamuelMarks):

 Thanks for those arguments, the build is currently running (no errors yet
 =]).

 Automated solutions to this problem include `grep` of:
 {{{
 gcc -dumpspecs
 }}}

 Or a `readelf` like from [http://www.trapkit.de/tools/checksec.html
 checksec.sh]:
 {{{
 #!bash
 if readelf -h $1 2>/dev/null | grep -q 'Type:[[:space:]]*EXEC'; then
   echo -n -e '\033[31mNo PIE       \033[m   '
 elif readelf -h $1 2>/dev/null | grep -q 'Type:[[:space:]]*DYN'; then
   if readelf -d $1 2>/dev/null | grep -q '(DEBUG)'; then
     echo -n -e '\033[32mPIE enabled  \033[m   '
   else
     echo -n -e '\033[33mDSO          \033[m   '
   fi
 else
   echo -n -e '\033[33mNot an ELF file\033[m   '
 fi
 }}}

 Alternatively in C++ take a look at this [http://lists.llvm.org/pipermail
 /cfe-commits/Week-of-Mon-20130408/077610.html LLVM patch implementation]
 of `isPIEDefault`.

 [https://wiki.dlang.org/LDC ldc] uses `llvm::Reloc::PIC_` to check, see:
 [https://github.com/ximion/ldc/blob/d9496882163e173ea718756a7fb0cbc627c5326f/...
 ldc/driver/targetmachine.cpp#L521]. In particular see `Reloc::Model
 TargetMachine::getRelocationModel() const` in LLVM's
 [http://llvm.org/docs/doxygen/html/classllvm_1_1TargetMachine.html#a87f1815c4...
 TargetMachine.cpp].

 Additionally there's this `gcc` patch [http://gcc.gnu.org/ml/gcc-
 patches/2016-07/msg01257.html check -nopie in configure].

 The compile-and-see approach you mentioned is used in various places also,
 e.g.: `gccSupportsFlag` function under [https://github.com/gcc-
 mirror/gcc/blob/be239ed2ba619747b64629895116f209b58baee8/libgo/go/cmd/go/build.go#L3082
 gcc/libgo/go/cmd/go/build.go#L3082].

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12755#comment:2
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