Test failure: #214: Changing linker flags

[Mikolaj]

PATH=/bin:/usr/bin dist/build/TestSuite/TestSuite \
  --extra-paths-74 ~/env/fpco-patched-7.4/local/bin:~/env/fpco-patched-7.4/dot-cabal/bin:~/env/ghc742/dot-cabal/bin \
  --package-db-74 ~/env/fpco-patched-7.4/dot-ghc/snippet-db \
  --extra-paths-78 ~/env/fpco-patched-7.8/local/bin:~/env/fpco-patched-7.8/dot-cabal/bin:~/env/ghc742/dot-cabal/bin \
  --package-db-78 ~/env/fpco-patched-7.8/dot-ghc/snippet-db \
  --test-78 \
  -j1 \
  -p 214

 #214: Changing linker flags:                                                                          FAIL
    expected: RunOk
     but got: RunGhcException "External exception: Server killed. Local exception: user error (demandInput: not enough bytes)"

[edsko]

@Mikolaj are you sure you are running the latest server? I thought I fixed this in #214 -- and I'm not getting failures here. That said, #214 is turning out to be a tricky issue that I thought was fixed in the past when it wasn't, so entirely possible there's still a problem somewhere.

[edsko]

This is only happening on Linux, and not on OSX. I have reproduced this on a VM. Gdb tells me that this is crashing with SIGSEGV in fputs.

[edsko]

@dcoutts, @Mikolaj : I think I found the source of the problem: we were not generating position independent code. I have now modified the code that so that always (unconditionally) generate position independent code; @dcoutts , it would be great if you could review the patch (820f980) -- it's a one line change.

[edsko]

(Note to self: http://stackoverflow.com/a/2422063/742991 is useful when debugging generated assembly code under gdb)