Re: Is it really possible to install gcc using prerequisites are installed in non standard directories.

[Jonathan Wakely <jwakely dot gcc at gmail dot com>]

On 10 May 2013 13:46, Allan Kamau wrote:
> I have been struggling for two days to get gcc to compile and install
> in a specific directory without success. If there is a HOWTO for this
> please point me to it.
>
>
> I have installed mpc-0.8.1, mpfr-2.4.2 and gmp-4.3.2 to specific
> directories as follows
>
> mpc-0.8.1=”/home/somebody/apps/gcc/mpc-0.8.1”
> mpfr-2.4.2=”/home/somebody/apps/gcc/mpfr-2.4.2”
> gmp-4.3.2=”/home/somebody/apps/gcc/gmp-4.3.2”

Why do you want to do it this way?

> I am compiling gcc-4.8.0 using the following options.
>
> date;time ~/apps/src/gcc-4.8.0/configure
> --with-mpc=/home/somebody/apps/gcc/mpc-0.8.1
> --with-mpfr=/home/somebody/apps/gcc/mpfr-2.4.2
> --with-gmp=/home/somebody/apps/gcc/gmp-4.3.2
> --prefix=/home/somebody/apps/gcc/gcc-4.8.0
> --with-gmp-lib=/home/somebody/apps/gcc/gmp-4.3.2/lib
> --with-gmp-include=/home/somebody/apps/gcc/gmp-4.3.2/include
> --with-mpfr-lib=/home/somebody/apps/gcc/mpfr-2.4.2/lib
> --with-mpfr-include=/home/somebody/apps/gcc/mpfr-2.4.2/include
> --with-mpc-lib=/home/somebody/apps/gcc/mpc-0.8.1/lib
> --with-mpc-include=/home/somebody/apps/gcc/mpc-0.8.1/include;date;
>
>
>
> The error is as follows
>
> checking whether ln -s works... yes
> checking for x86_64-unknown-linux-gnu-gcc...
> /home/somebody/apps/src/gcc-build/./gcc/xgcc
> -B/home/somebody/apps/src/gcc-build/./gcc/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/bin/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/lib/
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/include
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/sys-include
> checking for suffix of object files... configure: error: in
> `/home/somebody/apps/src/gcc-build/x86_64-unknown-linux-gnu/libgcc':
> configure: error: cannot compute suffix of object files: cannot compile
> See `config.log' for more details.
> make[2]: *** [configure-stage1-target-libgcc] Error 1
> make[2]: Leaving directory `/home/somebody/apps/src/gcc-build'
> make[1]: *** [stage1-bubble] Error 2
> make[1]: Leaving directory `/home/somebody/apps/src/gcc-build'
> make: *** [all] Error 2
>
>
> The file "/home/somebody/apps/src/gcc-build/x86_64-unknown-linux-gnu/libgcc/config.log"
> contains the error lines below:
>
> Thread model: posix
> gcc version 4.8.0 (GCC)
> configure:3358: $? = 0
> configure:3347: /home/somebody/apps/src/gcc-build/./gcc/xgcc
> -B/home/somebody/apps/src/gcc-build/./gcc/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/bin/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/lib/
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/include
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/sys-include
>    -V >&5
> xgcc: error: unrecognized command line option '-V'
> xgcc: fatal error: no input files
> compilation terminated.
> configure:3358: $? = 1
> configure:3347: /home/somebody/apps/src/gcc-build/./gcc/xgcc
> -B/home/somebody/apps/src/gcc-build/./gcc/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/bin/
> -B/home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/lib/
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/include
> -isystem /home/somebody/apps/gcc/gcc-4.8.0/x86_64-unknown-linux-gnu/sys-include
>    -qversion >&5
> xgcc: error: unrecognized command line option '-qversion'
> xgcc: fatal error: no input files
> compilation terminated.
> configure:3358: $? = 1

See http://gcc.gnu.org/wiki/FAQ#configure_suffix

The errors you've quoted are not the fatal ones that cause configure
to fail. The one that fails is almost certainly saying libmpc.so is
not found, or something similar.  The reason is that you've installed
the prerequisites in a directory that ld.so, the run-time linker,
doesn't know about, so it can't find the libraries.

The solution is to set
LD_LIBRARY_PATH=/home/somebody/apps/gcc/gmp-blah/lib:/home/somebody/apps/gcc/mpfr-blah/lib:/home/somebody/apps/gcc/mpc-blah/lib
in your environment, both when building GCC and when using it after
it's installed, but life would be much easier if you followed the
advice at http://gcc.gnu.org/wiki/InstallinGCC