egcs1.0.2 + libg++ cross build failure

[Joel Sherrill]

On Tue, 31 Mar 1998, Neal Becker wrote:

> I am trying to build egcs-1.0.2 + libg++-2.8.1 patch as cross with
> host i686-pc-linux-gnu target m68k-unknown-coff.
>
> I am building with newlib-1.8.0.

I regularly build m68k-rtems using newlib 1.8.0 and egcs 1.0.2 for all
languages (including fortran and objective-c) and don't have any real
problems.  It is just a matter of doing things in the right order.
 
> Problem 1) Headers aren't found.  Yes I've read the FAQ.  Headers
> can't possibly be found, because you have to install the compiler
> first, then you can install newlib.  My solution: I added
> --with-headers=<path_to_newlib>/newlib/libc/include.  *Luckily* the
> needed headers are all in this directory.

-Dinhibit-libc should be included on LIBGCC2_CFLAGS.  I thought the
configure scripts added this automatically on egcs.  This used ot be part
of the crossgcc patch.

> Problem 2) Configuring in m68k-unknown-coff/librx
> creating cache ./config.cache
> checking for gcc... /usr/local/src/m68k/egcs-1.0.2/gcc/xgcc -B/usr/local/src/m68k/egcs-1.0.2/gcc/
> checking whether the C compiler (/usr/local/src/m68k/egcs-1.0.2/gcc/xgcc -B/usr/local/src/m68k/egcs-1.0.2/gcc/ -g -O2 ) works... no
> configure: error: installation or configuration problem: C compiler
> cannot create executables.

Look at config.log but this indicates that the configure script is trying
to link a test program and can't.  It is probably because you have not
gotten a crt0.o yet as that is built with newlib.

> My solution: Go ahead and make -k install LANGUAGES="c c++".  Then
> build and install newlib.  Then go back and build in egcs+libg++ again 
> (now that crt0 is installed this last error will hopefully go away).

Yep.  This is how the RTEMS tool build script does it.  It does this

  + build/install c and c++
  + remove limits.h and libgcc.a and rebuild them so they don't have
      to do the inhibit_libc (RTEMS' limits.h is in newlib and gcc 
      can't find it the first time it generates xlimits.h)
  + build/install all other languages

This seems to work pretty reliably so I think you are on the right track.

--joel