Re: [GHC] #13771: ghc fails to build on openSUSE

1 Jun 2017

      #13771: ghc fails to build on openSUSE
---------------------------------+--------------------------------------
        Reporter:  msuchanek     |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  8.0.2
      Resolution:                |             Keywords:
Operating System:  Linux         |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by msuchanek):

 ok, so as I understand the issue distributions are moving towards
 compiling with -fPIE -pie or whatever is the current flag for whatever
 reason. It seems on SUSE these flags are added to rpm flags on the build
 service meaning system binaries are built with them but locally compiled
 binaries are not.

 Adding these flags requires that object files must be built with -fPIC and
 gcc complains if it is not the case and refuses to link binaries.

 == Issue: gcc started using PIE on system with ghc installed

 ==== simulation:
 {{{
 # mv /usr/bin/gcc /usr/bin/gcc.real
 cat > /usr/bin/gcc <

 int main(int argc, char** argv)
 {
   puts("Hello World!");
 }
 }}}

 {{{
 $ gcc -fno-pic -c -Wall hello_world.c -o hello_world.o
 $ gcc hello_world.o -o hello_world
 /usr/lib64/gcc/x86_64-suse-linux/6/../../../../x86_64-suse-linux/bin/ld:
 hello_world.o: relocation R_X86_64_32 against `.rodata' can not be used
 when making a shared object; recompile with -fPIC
 hello_world.o: error adding symbols: Bad value
 collect2: error: ld returned 1 exit status
 $ gcc -no-pie hello_world.o -o hello_world
 $ ./hello_world
 Hello World!
 }}}

 So gcc defaulting to PIE should be detected at bootstrap and at binary
 distribution installation and -fPIC should be added as default ghc flag.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13771#comment:3
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