Question

I am trying to install gcc 4.6 (mainly for having C++0x better supported) in my ubuntu 9.10 (via virtualbox). I referred to previous questions, but I am getting a different error.

I am referring this link for the installation. Now, I have done till the ./gcc-xx/configure ... step. Though it was giving some flex package related error. Mostly due to that make is also failing with below errors:

build/gengtype.o: In function
adjust_field_rtx_def':
/home/milind/ubuntu_shared/GCC/build/gcc/../../gcc-4.6-20110610/gcc/gengtype.c:978:
undefined reference tolexer_line’
/home/milind/ubuntu_shared/GCC/build/gcc/../../gcc-4.6-20110610/gcc/gengtype.c:1032:
undefined reference to lexer_line'
/home/milind/ubuntu_shared/GCC/build/gcc/../../gcc-4.6-20110610/gcc/gengtype.c:1042:
undefined reference tolexer_line’ ……………

Now this is giving me a hard time figuring it out because I have already flex/bison latest versions installed. I searched over internet for 2 days almost but no luck. Any help would be really appreciated. Also note that, I already have gcc 4.4 installed in /usr/bin/gcc and I have unzipped the gcc 4.6 tar in my home directory local folder.

[Note: I am also ok with installing ubuntu 11.10 too (which has gcc 4.6) as last resort. But I don’t know if its .iso image is available.]

Answer 1

I got this fixed. I followed following procedure:
[Note: run all the commands with sudo, if you are not login as root. e.g. sudo ls -ltr; sudo make install;

1. As mentioned in the link in my
   question, download the gcc4.6...tar
   file in a temporary place
2. Now find the place where current
   gcc is stored. e.g. My earlier
   gcc4.4 was stored in
   /usr/lib/gcc/i486-linux-gnu. Which
   has a folder called 4.4, 4.4.1
3. Create a folder named 4.6 (or
   4.6.1/2/3 etc.) and put that
   .tar file inside it. Untar the
   file as shown in link.
4. Follow all the procedure as per the
   link. Use nohup <command> & to
   track the logs. i.e. nohup make
clean all & followed by tail -f
nohup.out
5. If some error comes, it means some
   package is missing. Mostly those
   package will be present in your
   current gcc version. You can
   install them there itself. For
   example, in my case zlib was
   missing. I ran sudo apt-get install
zlib1g-dev libssl-dev and it worked
   fine. Otherwise download from internet and install it.
6. Once your gcc is installed, you
   can simply check it using type
gcc-4.6. In my case it showed that
   it’s stored as
   /usr/local/bin/g++-4.6.
7. Either you can use the same path to
   compile or you can put an alias in
   your bash/tcsh/ksh. e.g.
   /usr/local/bin/g++-4.6 -std=c++0x
-Wall test.cpp