help needed for builing gcc tool-chain

[Prashant Batra (prbatra)]

-----Original Message-----
From: Prashant Batra (prbatra) 
Sent: Sunday, February 12, 2012 12:47 AM
To: 'Jonathan Wakely'
Cc: gcc-help@gcc.gnu.org
Subject: RE: help needed for builing gcc tool-chain

Thanks, Jonathan,

I am able to install gcc 4.1.2 with following configuration:
../gcc-4.1.2/configure --prefix=/auto/nobackup-bgl-mitg-dev56/prbatra/fresh/build/ --enable-languages=c,c++,objc

Now, the tool-chain is present in "prefix" directory.

In second try, to make the tool-chain relocatable, I used --with-sysroot=<prefix-dir> while configuring.
It fails saying /usr/include directory is not present in the <prefix-dir>. 
Have I missed something again?
[Prashant] ../gcc-4.1.2/configure --prefix=/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build/ --with-sysroot=/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build/ --with-native-system-header-dir=sysroot --enable-languages=c,c++,objc
I tried to configure like above, still it fails with -

gcc.o g++spec.o intl.o prefix.o version.o  ../libcpp/libcpp.a   ../libiberty/libiberty.a
echo | /auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/objdir/./gcc/xgcc -B/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/objdir/./gcc/ -B/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build//x86_64-unknown-linux-gnu/bin/ -B/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build//x86_64-unknown-linux-gnu/lib/ -isystem /auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build//x86_64-unknown-linux-gnu/include -isystem /auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build//x86_64-unknown-linux-gnu/sys-include -E -dM - | \
          sed -n -e 's/^#define \([^_][a-zA-Z0-9_]*\).*/\1/p' \
                -e 's/^#define \(_[^_A-Z][a-zA-Z0-9_]*\).*/\1/p' | \
          sort -u > tmp-macro_list
/bin/sh ../../gcc-4.1.2/gcc/../move-if-change tmp-macro_list macro_list
echo timestamp > s-macro_list
The directory that should contain system headers does not exist:
  /auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/build//usr/include
make[2]: *** [stmp-fixinc] Error 1
make[2]: Leaving directory `/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/objdir/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/auto/nobackup-bgl-mitg-dev56/prbatra/fresh2/objdir'
make: *** [all] Error 2

-----Original Message-----
From: Jonathan Wakely [mailto:jwakely.gcc@gmail.com] 
Sent: Saturday, February 11, 2012 11:21 PM
To: Prashant Batra (prbatra)
Cc: gcc-help@gcc.gnu.org
Subject: Re: help needed for builing gcc tool-chain

On 11 February 2012 17:03, Prashant Batra (prbatra) wrote:
> Hi All,
>
> I am trying to build a 32 bit gcc/g++  tool-chain on a x86_64 bit Intel machine with, Red Hat Linux Enterprise -5 (2.6.18 kernel).
>
> Gcc version of my machine is -
> gcc -v
> Using built-in specs.
> Target: x86_64-redhat-linux
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux
> Thread model: posix
> gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)
>
> I tried with the procedure mentioned on gnu wiki,  also mentioned in LFS. But none of the attempts was successful.
>
> I  have some basic questions here :
>
> Changing the prefix to some custom location  other than /usr/src

I think the default is /usr/local/, not /usr/src

> should make all the tools installed in the custom location?

Yes

> I want to run the tool chain on this machine only, so my host and build systems are same, and I can omit them while configuring all my tools (binutils, gcc, glibc).
> Is this correct?

Yes.

> The target of all these tools while configuring should be i486-gnu-linux or I can omit this so that the gcc/g++ gets  compiled for x86_64 and when I need a 32 bit executable,
> I can use -m32 switch while compiling?

You can compile with -m32 to produce 32-bit output and you could add
-march=i486 to ensure it will not use any instructions not available
on an i486 processor.   But if you want a compiler that always
produces 32-bit output then yes, you could configure with
--target=i486-gnu-linux instead.

> Will 32 bit static and shared libraries be available in this case?

Yes.

> I want static libraries for both gcc and stdc++, is there any special flag that I should give/or not give to build these static libraries?

No, they're built by default.

> Can someone please point me in right directions, as I am doing this for the first time? Any links to the steps will be really helpful.

I already gave you http://gcc.gnu.org/wiki/InstallingGCC - if that
doesn't work you need to say how you configured and what errors you
get, it should work fine.  It will help if you stop creating a new
thread for every mail and reply to mail in an existing thread, so we
can see the thread history more easily.