omit building the target libiberty when building a cross compiler

[Ken Werner]

When using the Linaro GCC 4.6-2011.06-0 release as a base for building an Android cross toolchain the build fails with:
  checking for library containing strerror... configure: error: Link tests
  are not allowed after GCC_NO_EXECUTABLES.
  make[2]: *** [configure-target-libiberty] Error 1
  make[2]: Leaving directory

Android is using bionic and these configure tests are known to be fragile when using a different target libc. After applying the follwing patch to the Linaro GCC 4.6-2011.06-0 release the Android toolchain can be build without the --disable-libquadmath switch:
svn diff -r 175559:175560 svn://gcc.gnu.org/svn/gcc/branches/gcc-4_6-branch > 175560.patch

Since HP's patch is in the FSF's 4.6 branch already - Do we want to include it into our next release if it's not picked up automatically?

[Ken Werner (kwerner)]

The corresponding GNU Bugzilla is this one
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47836

[Ramana Radhakrishnan (ramana)]

I don't see why we can't just cherry pick that patch.

Ramana

[Michael Hope (michaelh1)]

The 2011.07 release is synced up to svn r175677 and will include this patch.

[Paul Sokolovsky (pfalcon)]

I confirm that Android gcc 4.6-2011.07 can be built without --disable-libquadmath