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I am running Ubuntu 12.04 and was hit by this gcc bug. In order to fix this I installed a more recent version of gcc (following this procedure). Now gcc -v and g++ -v both work, but packages that use libtool still use gcc-4.6.3.

How can I reconfigure libtool to pick up the updated gcc ?

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Answering my own question: The problem didn't really have anything to do with libtool (although it was revealed when building packages that used libtool). I had updated gcc and g++ to 4.8, but cpp was still at 4.6.3. After installing cpp-4.8 the problem is fixed.

Just for the record, the following should work fine for upgrading gcc to 4.8 on ubuntu 12.04:

$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test
$ sudo apt-get update
$ sudo apt-get install gcc-4.8 g++-4.8 cpp-4.8
$ sudo update-alternatives --install /usr/bin/cpp cpp /usr/bin/cpp-4.8 100 \
    --slave /usr/bin/g++ g++ /usr/bin/g++-4.8 \
    --slave /usr/bin/gcc gcc /usr/bin/gcc-4.8
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