[avr-gcc-list] cannot compile arrrghh...

[Volker Kuhlmann]

I have been unsuccessfully trying to compile a plain avr-gcc 4.6.2
package. The result always is

checking for suffix of object files... configure: error: in 
`/home/.../build-gcc-4.6.2/avr/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.

config.log is not very informative, other than for

xgcc: error: unrecognized option '-V'
xgcc: fatal error: no input files

It doesn't help that commands executed in much of the build system
aren't shown, but hacking in a few set -x gives me no more info.

Compiling the 4.3.3 package (openSUSE) works fine, with the same
configure options. The only difference is about 11 patches applied to
4.3.3, which obviously I don't want to apply to 4.6.2, and which don't
affect the compilation process as far as I can tell.

Relevant installed packages:

avr-libc-1.7.1-1.3.noarch
cross-avr-binutils-2.19.1-33.1.x86_64

These are rooted at /opt/cross/avr/

Also on the system:

 > ldconfig -p | egrep 'mpfr|gmp|mpc|cloog' | sort
 libcloog.so.0 (libc6,x86-64) => /usr/lib64/libcloog.so.0
 libgmp.so (libc6,x86-64) => /usr/lib64/libgmp.so
 libgmp.so.10 (libc6,x86-64) => /usr/lib64/libgmp.so.10
 libgmp.so.3 (libc6,x86-64) => /usr/lib64/libgmp.so.3
 libgmpxx.so (libc6,x86-64) => /usr/lib64/libgmpxx.so
 libgmpxx.so.4 (libc6,x86-64) => /usr/lib64/libgmpxx.so.4
 libmpc.so.2 (libc6,x86-64) => /usr/lib64/libmpc.so.2
 libmpcdec.so.5 (libc6,x86-64) => /usr/lib64/libmpcdec.so.5
 libmpfr.so.1 (libc6,x86-64) => /usr/lib64/libmpfr.so.1
 libmpfr.so.4 (libc6,x86-64) => /usr/lib64/libmpfr.so.4
 libppl.so.9 (libc6,x86-64) => /usr/lib64/libppl.so.9
 libppl_c.so.4 (libc6,x86-64) => /usr/lib64/libppl_c.so.4

and their headers. configure would not complete if they weren't.

Configure options:

%define prefix  /opt/cross/avr
%define vers    4.6.2
../gcc-%{vers}/configure \
        -v \
        --prefix=%{prefix} \
        --mandir=%{prefix}/share/man \
        --infodir=%{prefix}/share/info \
        --with-gnu-ld \
        --with-gnu-as \
        --target=${target} \
        --enable-languages="c,c++" \
        --disable-nls \
        --disable-libssp \
        --with-dwarf2

I added
        --program-prefix=avr- \
        --with-sys-root=%{prefix} \
which makes no difference.
I uninstalled avr-gcc previously, also no difference.

Adding
 export LD_LIBRARY_PATH="%{prefix}/lib:/usr/lib64:$LD_LIBRARY_PATH"
 export LD_RUN_PATH="%{prefix}/lib:/usr/lib64:$LD_RUN_PATH"
also does nothing.

This is a tad ridicolous - the build process seems to not find something
but doesn't complain. Searching the 'net shows a lot of "solutions"
(none work), but unfortunately not what the condition is that causes
this error - then one could deal with it.

Would someone knowlegable be able to say:

Do the gmp/mpfr/mpc/.. libraries need to be in the target system? Surely
not - they're used to build gcc, not run it on the target.

What exactly are the conditions leading to this error?

And what do I tell configure so it gets the job done..???

Thanks muchly,

Volker

-- 
Volker Kuhlmann
http://volker.dnsalias.net/     Please do not CC list postings to me.