Hi Martin and Jeff, thanks for the feedback - it was good to be able to press
on knowing that it should be possible. I've managed to get to the stage of
being able to build a simple executable by invoking gcc and ld seperately.
e.g. with PREFIX=/cross-compiler and SYSROOT=/cross-compiler/sysroot:
$PREFIX/bin/*gcc -c hello.c
$PREFIX/bin/*ld -o hello $SYSROOT/lib/crt0.o -lc hello.o
Or:
$/PREFIX/bin/*gcc -nodefaultlibs -nostartfiles $SYSROOT/lib/crt0.o -lc
hello.c
This is probably sufficient for my needs but there are some oddities (well,
they seem odd to me at least) which I've detailed below in case they're of
interest to anyone.
Thanks,
Jon
The oddities:
1. ld and gas have to be built explicitly
2. gcc is uanable to link with the built target libgcc
I'm using a combined tree with:
gcc-6.2.0
binutils-2.27
cloog-0.18.1
gmp-6.1.0
isl-0.16.1
mpc-1.0.3
mpfr-3.1.4
To build binutls:
../combined/configure --prefix=/cross-compiler
--with-sysroot=/cross-compiler/sysroot \
--target=powerpc-ibm-aix6.1 --host=x86_64-linux-gnu -v
make all-binutils && make install-binutils
doesn't build gas or ld so I have to additionally issue:
make all-gas && make install-gas
make all-ld && make install-ld
Using a combibed tree "as" and "ld" aren't built when running:
make all-binutils && make install-binutils
So I end having to run:
make all-gas && make install-gas
make all-ld && make install-ld
It seems strange that I have to do this and makes me think that I may have
somehow messed something up when putting together the combined tree or when
configuring the build.
To build gcc:
../combined/configure --prefix=/cross-compiler
--with-sysroot=/cross-compiler/sysroot \
--target=powerpc-ibm-aix6.1 --host=x86_64-linux-gnu \
--enable-languages=c,c++ -v
make all-gcc && make install-gcc
To build libgcc:
../combined/configure --prefix=/cross-compiler
--with-sysroot=/cross-compiler/sysroot \
--target=powerpc-ibm-aix6.1 --host=x86_64-linux-gnu \
--disable-multilib --disable-shared -v
make all-target-libgcc && make install-target-libgcc
This appears to work, however trying to link against it yields:
root@oc5328343620:/tmp# $PREFIX/bin/*gcc hello.c
collect2: fatal error:
/cross-compiler/lib/gcc/powerpc-ibm-aix6.1/6.2.0/libgcc.a: cannot open as
COFF file
compilation terminated.
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