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Richard Holloway's answer to this thread nicely explains how to upgrade from 4.6.3 to 4.7.0 (on 12.04, in my case) but I would like to upgrade to 4.7.1, which has been available for awhile. However there is no package g++-4.7.1 and I don't know otherwise how to do it, does anyone else?

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@lammilind Does this install 4.7.1? Looks like it's 4.7.0 instructions. – Matt Phillips Apr 22 at 15:58
@MattPhllips, now better to install 4.8.0. Above link illustrates the process. You should change the version number according to need. – iammilind Apr 23 at 3:07

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Wow, this was excruciating. Here's how I did it (NB, for a 32-bit system):

  1. $sudo apt-get install gcc-multilib

  2. $sudo apt-get install m4

  3. Download mpfr, configure, make, make install

  4. Download gmp, configure, make, make install

  5. Download mpc, configure, make, make install

  6. In order to compensate for insufficient path information, added this to .bashrc

export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

export LIBRARY_PATH=/usr/lib/i386-linux-gnu export

export C_INCLUDE_PATH=/usr/include/i386-linux-gnu export

export CPLUS_INCLUDE_PATH=/usr/include/i386-linux-gnu

the former I got from here and the latter from here, modified appropriately for my install locations.

.7. Add these symlinks for the same reason:

$sudo ln -s /usr/include/i386-linux-gnu/gnu/stubs-32.h /usr/include/gnu

$sudo ln -s /usr/lib/i386-linux-gnu/crti.o /usr/lib/crti.o

$sudo ln -s /usr/lib/i386-linux-gnu/crt1.o /usr/lib/crt1.o

$sudo ln -s /usr/lib/i386-linux-gnu/crtn.o /usr/lib/crtn.o

$sudo ln -s /usr/local/lib/libmpc.so.3 /usr/lib/libmpc.so.3

.8. Download g++-4.7.1, configure, make, make install

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Try to compile g++-4.7.1

List of mirrors:

http://gcc.gnu.org/mirrors.html

Select mirror, click releases and search for gcc-4.7.1.

Download source, and compile.

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Thanks, working on it--looks like there's a lot of dependencies to wade through first so it might be awhile. – Matt Phillips Jul 27 '12 at 18:29
Well, after installing gmp, mpc, and mpfr as well as gcc-multilib (to get rid of an error arising because the compiler couldn't find bits/predefs.h), now the compiler can't find gnu/stubs-32.h. The weird thing is that this seems to be a problem when compiling in 32 bit mode on a 64-bit system--however I'm doing this on a 32-bit laptop. apt-file says this is part of the libc6-dev package, but I already have the newest version installed... – Matt Phillips Jul 27 '12 at 20:07

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