ghc 7.4.1-4ubuntu2 source package in Ubuntu

Changelog

ghc (7.4.1-4ubuntu2) quantal; urgency=low

  * So here's the whole lowdown: On PowerPC we have a special case of
    24-bit relative relocations (+-32Megs). This works badly when we use
    mmap because we almost always have to mmap() oc->symbol_extras for
    the jumpIslands. In doing so, we are most certainly not going to get
    an address that is close enough to oc->image. So we cannot use mmap
    on PowerPC. However, when using malloc() and friends, we realloc to
    get the memory for the jumpIslands, which makes it close enough to
    work, but because GNU libc internally uses mmap() for > 128k allocs,
    we get a piece of memory that does not have PROT_EXEC enabled. So on
    modern CPUs, we will segv as soon as we hit the jumpIsland. Fortunately
    we have a way to work around this.
  * ppc-needs-use-mmap.patch: Remove patch and revert back to not using
    mmap on powerpc-linux.
  * linux-disable-mmap-for-malloc-when-not-using-mmap.patch: For the case
    where we have !USE_MMAP on Linux (such as powerpc-linux), call
    mallopt() to disable its internal use of mmap.
 -- Ben Collins <email address hidden>   Wed, 11 Jul 2012 17:00:41 -0400